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Hex Control, C++/MFC

Table of Contents

Introduction

Being good low level library on top of Windows API in general, MFC was always lacking a good native controls support. This HexControl is an attempt to expand standard MFC functionality, because at the moment MFC doesn't provide support for such control.

This doesn't mean that HexControl is limited to use only in MFC environment. The control is implemented as a pure abstract interface, and can be used as a child or popup window in any place of your application.
It is written and tested with /std:c++17 in Visual Studio 2019, under the Windows 10.

The main features of the HexControl:

  • View and edit data up to 16EB (exabyte)
  • Work in three different data modes: Memory, Message, Virtual.
  • Fully featured Bookmarks manager
  • Search and Replace... for Hex, Ascii, UTF-16
  • Many options to Copy/Paste to/from clipboard
  • Undo/Redo
  • Modify data with Filling and many predefined Operations options
  • Ability to visually divide data into sectors
  • Print whole document/pages range/selection
  • Cutomizable look and appearance
  • Written with /std:c++17 standard conformance

Installation

The HexControl can be used in two different ways:

  • Building from the sources as a part of your project
  • Using as a .dll.

Building From The Sources

The building process is quite simple:

  1. Copy HexCtrl folder and its content (except *.vcxproj files) into your project's folder.
  2. Add all files from that HexCtrl folder into your project.
  3. Add #include "HexCtrl/HexCtrl.h" where you suppose to use the control.
  4. Declare IHexCtrlPtr member variable: IHexCtrlPtr myHex { CreateHexCtrl() };
  5. Create control instance.

If you want to build HexControl from the sources in non MFC app you will have to:

  1. Add support for Use MFC in a Shared DLL in your project settings.
  2. Uncomment the line //#define HEXCTRL_MANUAL_MFC_INIT in HexCtrl.h header file.

Dynamic Link Library

To use HexControl as the .dll do the following:

  1. Copy HexCtrl.h file into your project's folder.
  2. Copy HexCtrl.lib file into your project's folder, so that linker can see it.
  3. Put HexCtrl.dll file next to your .exe file.
  4. Add the following line where you suppose to use the control:
#define HEXCTRL_SHARED_DLL //You can alternatively uncomment this line in HexCtrl.h.
#include "HexCtrl.h"`
  1. Declare IHexCtrlPtr member variable: IHexCtrlPtr myHex { CreateHexCtrl() };
  2. Create control instance.

To build HexCtrl.dll and HexCtrl.lib use the HexCtrl/HexCtrl.vcxproj Visual Studio project.

Remarks:

HexControl's .dll is built with MFC Static Linking. So even if you are to use it in your own MFC project, even with different MFC version, there should not be any interferences

Building HexControl with MFC Shared DLL turned out to be a little tricky. Even with the help of AFX_MANAGE_STATE(AfxGetStaticModuleState()) macro there always were MFC debug assertions, which origins quite hard to comprehend.

IHexCtrlPtr

IHexCtrlPtr is, in fact, a pointer to a IHexCtrl pure abstract base class, wrapped either in std::unique_ptr or std::shared_ptr. You can choose whatever is best for your needs by define or undefine/comment-out the HEXCTRL_IHEXCTRLPTR_UNIQUEPTR macro in HexCtrl.h.
By default HEXCTRL_IHEXCTRLPTR_UNIQUEPTR is defined, thus IHexCtrlPtr is an alias for std::unique_ptr<IHexCtrl>.

This wrapper is used mainly for convenience, so you don't have to bother about object lifetime, it will be destroyed automatically. That's why there is a call to the factory function CreateHexCtrl() - to properly initialize a pointer.

If you, for some reason, need a raw interface pointer, you can directly call CreateRawHexCtrl function, which returns IHexCtrl interface pointer, but in this case you will need to call Destroy method manually afterwards, to destroy IHexCtrl object.

Namespace

HexControl uses its own namespace HEXCTRL.
So it's up to you, whether to use namespace prefix before declarations:

HEXCTRL::

or to define namespace globally, in the source file's beginning:

using namespace HEXCTRL;

Creating

Classic Approach

Create is the first method you call to create HexControl instance. It takes HEXCREATESTRUCT reference as an argument.

You can choose whether control will behave as a child or independent popup window, by setting enCreateMode member of this struct to EHexCreateMode::CREATE_CHILD or EHexCreateMode::CREATE_POPUP respectively.

HEXCREATESTRUCT hcs;
hcs.enCreateMode = EHexCreateMode::CREATE_POPUP;
hcs.hwndParent = m_hWnd;
m_myHex->Create(hcs);

For all available options see HEXCREATESTRUCT description.

In Dialog

To use HexControl within Dialog you can, of course, create it with the Classic Approach, call Create method and provide all the necessary information.

But there is another option you can use:

  1. Put Custom Control from the Toolbox in Visual Studio dialog designer into your dialog template and make it desirable size.
  2. Go to the Properties of that control and in the Class field, within the Misc section, type: HexCtrl.
    Give the control appropriate ID of your choise (IDC_MY_HEX in this example).
    Also, here you can set the control's Dynamic Layout properties, so that control behaves appropriately when dialog is being resized.
  3. Declare IHexCtrlPtr member varable within your dialog class:
IHexCtrlPtr m_myHex { CreateHexCtrl() };
  1. Call CreateDialogCtrl method from your dialog's OnInitDialog method.
BOOL CMyDialog::OnInitDialog()
{
    CDialogEx::OnInitDialog();
    
    m_myHex->CreateDialogCtrl(IDC_MY_HEX, m_hWnd);
}

Set the Data

To set a data to display in the HexControl use SetData method. The code below shows how to construct IHexCtrlPtr object and display first 0x1FF bytes of the current app's memory:

IHexCtrlPtr myHex { CreateHexCtrl() };

HEXCREATESTRUCT hcs;
hcs.hwndParent = m_hWnd;
hcs.rect = {0, 0, 600, 400}; //Window rect.

myHex->Create(hcs);

HEXDATASTRUCT hds;
hds.pData = (unsigned char*)GetModuleHandle(0);
hds.ullDataSize = 0x1FF;

myHex->SetData(hds);

The next example displays std::string's text as hex:

std::string str = "My string";
HEXDATASTRUCT hds;
hds.pData = (unsigned char*)str.data();
hds.ullDataSize = str.size();

myHex->SetData(hds);

Data Modes

Besides the standard classical mode, when HexControl just holds a pointer to some array of bytes in memory, it also has additional advanced modes it can be running in.
These modes can be quite useful for instance in cases where you need to display a very large amount of data that can't fit in memory all at once.

These modes are ruled over through the enDataMode member of HEXDATASTRUCT.

Memory Data

It's the default data mode the control works in.
The enDataMode member of the HEXDATASTRUCT is set to DATA_MEMORY, and pData just points to bytes in memory.

Message Window

If enDataMode member of HEXDATASTRUCT is set to DATA_MSG, the control works in, so called, Message Window mode.

What it means is that when control is about to display data, it will first ask for this data from the HEXDATASTRUCT::hwndMsg window, in the form of WM_NOTIFY Windows' message. This is pretty much the same as the standard MFC List Control works when created with LVS_OWNERDATA flag.
By default the HEXDATASTRUCT::hwndMsg is equal to the control's parent window.

To properly handle this mode, you must process WM_NOTIFY messages in hwndMsg window as follows:

BOOL CMyWnd::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
    PHEXNOTIFYSTRUCT pHexNtfy = (PHEXNOTIFYSTRUCT)lParam;
    if (pHexNtfy->hdr.idFrom == IDC_MY_HEX)
    {
        switch (pHexNtfy->hdr.code)
        {
        case HEXCTRL_MSG_GETDATA:
            /**************************************************************************
            * pHexNtfy->stSpan at this moment shows offset and size of the data 
            * that HexCtrl requests. You have to provide pointer to it.
            ***************************************************************************
            
            pHexNtfy->pData =  /*Set this pointer to an actual data*/;
            break;
        }
   }
}

lParam will hold a pointer to the HEXNOTIFYSTRUCT structure.

The first member of this structure is a standard Windows' NMHDR struct, it will have its code member equal to HEXCTRL_MSG_GETDATA, indicating that HexControl's byte request has arrived.
The ullIndex member of the structure is an index of the byte to be displayed. And the pData is the pointer to an actual byte that you have to set in response.

Virtual Handler

If enDataMode member of HEXDATASTRUCT is set to DATA_VIRTUAL then all the data routine will be done through HEXDATASTRUCT::pHexVirtual pointer.

This pointer is of IHexVirtual class type, which is a pure abstract base class. You have to derive your own class from it and implement all its public methods:

class IHexVirtual
{
public:
    virtual std::byte* GetData(const HEXSPANSTRUCT&) = 0;       //Data index and size to get.
    virtual void SetData(std::byte*, const HEXSPANSTRUCT&) = 0; //Routine to modify data, if HEXDATASTRUCT::fMutable == true.
};

Then provide a pointer to created object of this derived class prior to call to SetData method in form of HEXDATASTRUCT::pHexVirtual = &yourDerivedObject.

Virtual Bookmarks

HexControl has innate functional to work with any amount of bookmarked regions. These regions can be assigned with individual background and text color and description.

But if you have some big and complicated data logic and want to handle all these regions yourself, you can do it.
For this you have to inherit your own class from the IHexBkmVirtual pure virtual interface and implement all the routines withing this class.
To enable virtual bookmarks call the BkmSetVirtual method.

The main method of the IHexBkmVirtual interface is HitTest. It takes byte's offset and returns pointer to HEXBOOKMARKSTRUCT if there is a bookmark withing this byte, or nullptr otherwise.

class IHexBkmVirtual
{
public:
    virtual ULONGLONG Add(const HEXBOOKMARKSTRUCT& stBookmark) = 0; //Add new bookmark, return new bookmark's ID.
    virtual void ClearAll() = 0; //Clear all bookmarks.
    [[nodiscard]] virtual ULONGLONG GetCount() = 0; //Get total bookmarks count.
    [[nodiscard]] virtual auto GetByID(ULONGLONG ullID)->HEXBOOKMARKSTRUCT* = 0; //Bookmark by ID.
    [[nodiscard]] virtual auto GetByIndex(ULONGLONG ullIndex)->HEXBOOKMARKSTRUCT* = 0; //Bookmark by index (in inner list).
    [[nodiscard]] virtual auto HitTest(ULONGLONG ullOffset)->HEXBOOKMARKSTRUCT* = 0; //Has given offset the bookmark?
    virtual void RemoveByID(ULONGLONG ullID) = 0;   //Remove bookmark by given ID (returned by Add()).
};

Methods

The HexControl has plenty of methods that you can use to customize its appearance, and to manage its behaviour.

BkmAdd

ULONGLONG BkmAdd(const HEXBOOKMARKSTRUCT& hbs, bool fRedraw = false)

Adds new bookmark to the control. Uses HEXBOOKMARKSTRUCT as an argument. Returns created bookmark's id.

Example

HEXBOOKMARKSTRUCT hbs;
hbs.vecSpan.emplace_back(HEXSPANSTRUCT { 0x1, 10 });
hbs.clrBk = RGB(0, 255, 0);
hbs.clrText = RGB(255, 255, 255);
hbs.wstrDesc = L"My first bookmark, with green bk and white text.";

myHex.BkmAdd(hbs);

BkmClearAll

void BkmClearAll();

Clears all bookmarks.

BkmGetByID

BkmGetByID(ULONGLONG ullID)->HEXBOOKMARKSTRUCT*;

Get bookmark by ID.

BkmGetByIndex

auto BkmGetByIndex(ULONGLONG ullIndex)->HEXBOOKMARKSTRUCT*;

Get bookmark by Index.

BkmGetCount

ULONGLONG BkmGetCount()const;

Get bookmarks' count.

BkmHitTest

auto BkmHitTest(ULONGLONG ullOffset)->HEXBOOKMARKSTRUCT*;

Test given offset and retrives pointer to HEXBOOKMARKSTRUCT if it contains bookmark.

BkmRemoveByID

void BkmRemoveByID(ULONGLONG ullID);

Removes bookmark by the given ID.

BkmSetVirtual

void BkmSetVirtual(bool fEnable, IHexBkmVirtual* pVirtual = nullptr);

Enables or disables bookmarks virtual mode.

ClearData

void ClearData();

Clears data from the HexControl view, not touching data itself.

Create

bool Create(const HEXCREATESTRUCT& hcs);

Main initialization method.
Takes HEXCREATESTRUCT as argument. Returns true if created successfully, false otherwise.

CreateDialogCtrl

bool CreateDialogCtrl(UINT uCtrlID, HWND hwndDlg);

Creates HexControl from Custom Control dialog's template. Takes control's id, and dialog's window handle as arguments. See Creating section for more info.

Destroy

void Destroy();

Destroys the control.
You only invoke this method if you use a raw IHexCtrl pointer obtained by the call to CreateRawHexCtrl function. Otherwise don't use it.

Remarks
You usually don't need to call this method unless you use HexControl through the raw pointer obtained by CreateRawHexCtrl factory function.
If you use HexControl in standard way, through the IHexCtrlPtr pointer, obtained by CreateHexCtrl function, this method will be called automatically.

ExecuteCmd

void ExecuteCmd(EHexCmd enCmd)const;

Executes one of the predefined commands of EHexCmd enum. All these commands are basically replicating control's inner menu.

GetCapacity

DWORD GetCapacity()const

Returns current capacity.

GetCaretPos

ULONGLONG GetCaretPos()const;

Retrieves current caret position offset.

GetColor

auto GetColor()const->HEXCOLORSTRUCT

Returns current HEXCOLORSTRUCT.

GetFontSize

long GetFontSize()const;

Returns current font size.

GetMenuHandle

HMENU GetMenuHandle()const;

Retrives the HMENU handle of the control's context menu. You can use this handle to customize menu for your needs.

Control's internal menu uses menu IDs in range starting from 0x8001. So if you wish to add your own new menu, assign menu ID starting from 0x9000 to not interfere.

When user clicks custom menu, control sends WM_NOTIFY message to its parent window with LPARAM pointing to HEXNOTIFYSTRUCT with its hdr.code member set to HEXCTRL_MSG_MENUCLICK. ullData field of the HEXNOTIFYSTRUCT will be holding ID of the menu clicked.

GetSectorSize

DWORD GetSectorSize()const;

Gets current sector size set by SetSectorSize.

GetSelection

auto GetSelection()const->std::vector<HEXSPANSTRUCT>&;

Returns std::vector of offsets and sizes of the current selection.

GetShowMode

auto GetShowMode()const->EHexShowMode;

Retrieves current data show mode.

GetWindowHandle

HWND GetWindowHandle()const

Retrieves control's window handle.

GoToOffset

void GoToOffset(ULONGLONG ullOffset, bool fSelect, ULONGLONG ullSize)

Jumps to the ullOffset offset, and selects ullSize bytes if fSelect is true.

IsCmdAvail

bool IsCmdAvail(EHexCmd enCmd)const;

Returns true if given command can be executed at the moment, false otherwise.

IsCreated

bool IsCreated()const;

Shows whether HexControl is created or not yet.

IsDataSet

bool IsDataSet()const;

Shows whether a data was set to HexControl or not

IsMutable

bool IsMutable()const;

Shows whether HexControl is currently in edit mode or not.

IsOffsetAsHex

bool IsOffsetAsHex()const;

Is "Offset" currently represented (shown) as Hex or as Decimal. It can be changed by double clicking at offset area.

SetCapacity

void SetCapacity(DWORD dwCapacity);

Sets the HexControl current capacity.

SetColor

void SetColor(const HEXCOLORSTRUCT& clr);

Sets all the colors for the control. Takes HEXCOLORSTRUCT as the argument.

SetData

void SetData(const HEXDATASTRUCT& hds);

Main method to set data to display in read-only or edit modes. Takes HEXDATASTRUCT as an argument.

SetFont

void SetFont(const LOGFONTW* pLogFontNew);

Sets a new font for the HexControl. This font has to be monospaced.

SetFontSize

void SetFontSize(UINT uiSize);

Sets a new font size to the HexControl.

SetMutable

void SetMutable(bool fEnable);

Enables or disables mutable mode. In mutable mode all the data can be modified.

SetSectorSize

void SetSectorSize(DWORD dwSize, const wchar_t* wstrName = L"Sector");

Sets the size of the sector to draw the divider line between. This size should be multiple to the current capacity size to take effect. The second argument sets the name to be displayed in the bottom info area of the HexControl ("Sector", "Page", "etc...").
To remove the divider just set dwSize to 0.

SetSelection

void SetSelection(ULONGLONG ullOffset, ULONGLONG ullSize)

Sets current selection.

SetShowMode

void SetShowMode(EHexShowMode enShowMode);

Sets current data show mode. See EHexShowMode for more info.

SetWheelRatio

void SetWheelRatio(double dbRatio)

Sets the ratio for how much to scroll with mouse-wheel.

ShowDlg

void ShowDlg(EHexDlg enDlg, bool fShow)const;

Show or hide HexControl's internal dialog window, from EHexDlg enum.

Structures

Below are listed all HexControl's structures.

HEXCREATESTRUCT

The main initialization struct used for control creation.

struct HEXCREATESTRUCT
{
    EHexCreateMode  enCreateMode { EHexCreateMode::CREATE_CHILD }; //Creation mode of the HexCtrl window.
    EHexShowMode    enShowMode { EHexShowMode::ASBYTE };           //Data representation mode.
    HEXCOLORSTRUCT  stColor { };          //All the control's colors.
    HWND            hwndParent { };       //Parent window pointer.
    const LOGFONTW* pLogFont { };         //Font to be used, nullptr for default. This font has to be monospaced.
    RECT            rect { };             //Initial rect. If null, the window is screen centered.
    UINT            uID { };              //Control ID.
    DWORD           dwStyle { };          //Window styles, 0 for default.
    DWORD           dwExStyle { };        //Extended window styles, 0 for default.
    double          dbWheelRatio { 1.0 }; //Ratio for how much to scroll with mouse-wheel.
};

HEXCOLORSTRUCT

This structure describes all control's colors. All these colors have their default values.

struct HEXCOLORSTRUCT
{
    COLORREF clrTextHex { GetSysColor(COLOR_WINDOWTEXT) };         //Hex chunks text color.
    COLORREF clrTextAscii { GetSysColor(COLOR_WINDOWTEXT) };       //Ascii text color.
    COLORREF clrTextSelected { GetSysColor(COLOR_HIGHLIGHTTEXT) }; //Selected text color.
    COLORREF clrTextDataInterpret { RGB(250, 250, 250) };          //Data Interpreter text color.
    COLORREF clrTextCaption { RGB(0, 0, 180) };                    //Caption text color
    COLORREF clrTextInfoRect { GetSysColor(COLOR_WINDOWTEXT) };    //Text color of the bottom "Info" rect.
    COLORREF clrTextCursor { RGB(255, 255, 255) };                 //Cursor text color.
    COLORREF clrTextTooltip { GetSysColor(COLOR_INFOTEXT) };       //Tooltip text color.
    COLORREF clrBk { GetSysColor(COLOR_WINDOW) };                  //Background color.
    COLORREF clrBkSelected { GetSysColor(COLOR_HIGHLIGHT) };       //Background color of the selected Hex/Ascii.
    COLORREF clrBkDataInterpret { RGB(147, 58, 22) };              //Data Interpreter Bk color.
    COLORREF clrBkInfoRect { GetSysColor(COLOR_BTNFACE) };         //Background color of the bottom "Info" rect.
    COLORREF clrBkCursor { RGB(0, 0, 255) };                       //Cursor background color.
    COLORREF clrBkCursorSelected { RGB(0, 0, 200) };               //Cursor background color in selection.
    COLORREF clrBkTooltip { GetSysColor(COLOR_INFOBK) };           //Tooltip background color.
};

HEXDATASTRUCT

Main struct to set a data to display in the control.

struct HEXDATASTRUCT
{
    EHexDataMode  enDataMode { EHexDataMode::DATA_MEMORY }; //Working data mode.
    ULONGLONG     ullDataSize { };          //Size of the data to display, in bytes.
    HEXSPANSTRUCT stSelSpan { };            //Select .ullOffset initial position. Works only if .ullSize > 0.
    HWND          hwndMsg { };              //Window for DATA_MSG mode. Parent is used by default.
    IHexVirtual*  pHexVirtual { };          //Pointer for DATA_VIRTUAL mode.
    std::byte*    pData { };                //Data pointer for DATA_MEMORY mode. Not used in other modes.
    DWORD         dwCacheSize { 0x800000 }; //In DATA_MSG and DATA_VIRTUAL max cached size of data to fetch.
    bool          fMutable { false };       //Is data mutable (editable) or read-only.
    bool          fHighLatency { false };   //Do not redraw window until scrolling completes.
};

HEXSPANSTRUCT

This struct is used mostly in selection and bookmarking routines. It holds offset and size of the data region.

struct HEXSPANSTRUCT
{
    ULONGLONG ullOffset { };
    ULONGLONG ullSize { };
};

HEXBOOKMARKSTRUCT

Structure for bookmarks, used in BkmAdd method.

struct HEXBOOKMARKSTRUCT
{
    std::vector<HEXSPANSTRUCT> vecSpan { };                //Vector of offsets and sizes.
    std::wstring               wstrDesc { };               //Description.
    ULONGLONG                  ullID { };                  //Bookmark id. Must be 0, assigned internally by framework.
    ULONGLONG                  ullData { };                //User defined custom data.
    COLORREF                   clrBk { RGB(240, 240, 0) }; //Bk color.
    COLORREF                   clrText { RGB(0, 0, 0) };   //Text color.
};
using PHEXBOOKMARKSTRUCT = HEXBOOKMARKSTRUCT*;

The member vecSpan is of a std::vector<HEXSPANSTRUCT> type because a bookmark may have few non adjacent areas. For instance, when selection is made as a block, with Alt pressed.

HEXNOTIFYSTRUCT

This struct is used in notification purposes, to notify parent window about HexControl's states.

struct HEXNOTIFYSTRUCT
{
    NMHDR         hdr { };     //Standard Windows header. For hdr.code values see HEXCTRL_MSG_* messages.
    HEXSPANSTRUCT stSpan { };  //Offset and size of the bytes. 
    ULONGLONG     ullData { }; //Data depending on message (e.g. user defined custom menu id/cursor pos).
    std::byte*    pData { };   //Pointer to a data to get/send.
};
using PHEXNOTIFYSTRUCT = HEXNOTIFYSTRUCT*;

EHexCmd

Enum of commands HexCtrl can execute. Basically these commands duplicate inner menu.

enum class EHexCmd : WORD
{
    CMD_SEARCH = 0x01, CMD_SEARCH_NEXT, CMD_SEARCH_PREV,
    CMD_SHOWDATA_BYTE, CMD_SHOWDATA_WORD, CMD_SHOWDATA_DWORD, CMD_SHOWDATA_QWORD,
    CMD_BKM_ADD, CMD_BKM_REMOVE, CMD_BKM_NEXT, CMD_BKM_PREV, CMD_BKM_CLEARALL, CMD_BKM_MANAGER,
    CMD_CLIPBOARD_COPY_HEX, CMD_CLIPBOARD_COPY_HEXLE, CMD_CLIPBOARD_COPY_HEXFMT, CMD_CLIPBOARD_COPY_ASCII,
    CMD_CLIPBOARD_COPY_BASE64, CMD_CLIPBOARD_COPY_CARR, CMD_CLIPBOARD_COPY_GREPHEX, CMD_CLIPBOARD_COPY_PRNTSCRN,
    CMD_CLIPBOARD_PASTE_HEX, CMD_CLIPBOARD_PASTE_ASCII,
    CMD_MODIFY_OPERS, CMD_MODIFY_FILLZEROS, CMD_MODIFY_FILLDATA, CMD_MODIFY_UNDO, CMD_MODIFY_REDO,
    CMD_SEL_MARKSTART, CMD_SEL_MARKEND, CMD_SEL_SELECTALL,
    CMD_DATAINTERPRET,
    CMD_APPEARANCE_FONTINC, CMD_APPEARANCE_FONTDEC, CMD_APPEARANCE_CAPACITYINC, CMD_APPEARANCE_CAPACITYDEC,
    CMD_PRINT, CMD_ABOUT
};

EHexCreateMode

Enum that represents mode the HexControl's window will be created in.

enum class EHexCreateMode : WORD
{
    CREATE_CHILD, CREATE_POPUP, CREATE_CUSTOMCTRL
};

EHexDataMode

Enum that represents current data mode HexControl works in. It's used as HEXDATASTRUCT member in SetData method.

enum class EHexDataMode : WORD
{
    DATA_MEMORY, DATA_MSG, DATA_VIRTUAL
};

EHexDlg

All HexControl's internal dialog windows.

enum class EHexDlg : WORD
{
    DLG_BKMMANAGER, DLG_DATAINTERPRET, DLG_FILLDATA, DLG_OPERS, DLG_SEARCH
};

EHexShowMode

Enum that represents available data show modes.

enum class EHexShowMode : WORD
{
    ASBYTE = 1, ASWORD = 2, ASDWORD = 4, ASQWORD = 8
};

Notification Messages

During its work HexControl sends notification messages through WM_NOTIFY mechanism to indicate its states. These messages are sent either to HEXCREATESTRUCT::hwndParent or to HEXDATASTRUCT::hwndMsg window, depending on whether the latter is set.
The LPARAM of the WM_NOTIFY message will hold pointer to the HEXNOTIFYSTRUCT.

HEXCTRL_MSG_BKMCLICK

Sent if bookmark is clicked. HEXNOTIFYSTRUCT::pData will contain HEXBOOKMARKSTRUCT pointer.

HEXCTRL_MSG_CARETCHANGE

Sent when caret position has changed. HEXNOTIFYSTRUCT::ullData will contain current caret position.

HEXCTRL_MSG_CONTEXTMENU

Sent when context menu is about to be displayed.

HEXCTRL_MSG_DESTROY

Sent to indicate that HexControl window is about to be destroyed.

HEXCTRL_MSG_GETDATA

Used in DATA_MSG mode to acquire the data range to display.

HEXCTRL_MSG_MENUCLICK

Sent when user defined custom menu has been clicked.

HEXCTRL_MSG_SELECTION

Sent when selection has been made.

HEXCTRL_MSG_SETDATA

Sent to indicate that the data has changed.

HEXCTRL_MSG_VIEWCHANGE

Sent when HexControl's view has changed, whether on resizing or scrolling. HEXNOTIFYSTRUCT::stSpan will contain starting offset and size of the visible data.

Exported Functions

HexControl has few "C" interface functions which it exports when built as .dll.

CreateRawHexCtrl

extern "C" HEXCTRLAPI IHexCtrl* __cdecl CreateRawHexCtrl();

Main function that creates raw IHexCtrl interface pointer. You barely need to use this function in your code.
See the IHexCtrlPtr section for more info.

GetHexCtrlInfo

extern "C" HEXCTRLAPI HEXCTRLINFO* __cdecl GetHexCtrlInfo();

Returns pointer to HEXCTRLINFO, which is the HexControl's service information structure.

HEXCTRLINFO

Service structure, keeps HexControl's version information.

struct HEXCTRLINFO
{
    const wchar_t* pwszVersion { };        //WCHAR version string.
    union {
        unsigned long long ullVersion { }; //ULONGLONG version number.
        struct {
            short wMajor;
            short wMinor;
            short wMaintenance;
            short wRevision;
        }stVersion;
    };
};

Positioning and Sizing

To properly resize and position your HexControl's window you may have to handle WM_SIZE message in its parent window, in something like this way:

void CMyWnd::OnSize(UINT nType, int cx, int cy)
{
    //...
    ::SetWindowPos(m_myHex->GetWindowHandle(), this->m_hWnd, 0, 0, cx, cy, SWP_NOACTIVATE | SWP_NOZORDER);
}

Appearance

To change control's font size — Ctrl+MouseWheel
To change control's capacity — Ctrl+Shift+MouseWheel

Licensing

This software is available under the "MIT License modified with The Commons Clause".
Briefly: It is free for any non commercial use.
https://github.com/jovibor/HexCtrl/blob/master/LICENSE

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Hex Control, C++/MFC

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