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P
Pierrot_Dev
Participant
June 9, 2017
Answered

Add a bitmap to a button

  • June 9, 2017
  • 1 reply
  • 473 views

I have compiled the sample code "EmptyPanel" of the sdk, then made my own version with a control bar and some buttons.

I would like to add bitmaps to the buttons, adding the BS_BITMAP style to the native windows buttons then sending

hInst = (HINSTANCE)GetWindowLongPtr((HWND)ctrlBarPlatformWindow, GWLP_HINSTANCE);

hBmp = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));

hBmp hInst are global to the plugin class. hBmp returns 0;

then

SendMessage((HWND)hwndButtonPrevious, (UINT)BM_SETIMAGE, (WPARAM)IMAGE_BITMAP, (LPARAM)hBmp);

The function is called in the CtrlBarWindowProc between two Push/Pop AppContext otherwise not working.

Buttons are responding normally to command and make the job.

But I never had any image on it!

I tried many variations, but nothing happen.

I guess something wrong with hInst, hBmp, or the place where I Send the BM_SETIMAGE message

Any idea?

Pierre

This topic has been closed for replies.
Correct answer LeoTaro

The LoadBitmap call is failing (hBmp is NULL), because you are using the application HINSTANCE rather than the one for your plugin (dll). Add a DllMain function to your plugin and store the HINSTANCE.

HINSTANCE hDll = NULL;

BOOL APIENTRY DllMain( HINSTANCE hinstDLL, DWORD ul_reason, LPVOID reserved)

{ 

  if (DLL_PROCESS_ATTACH == ul_reason)

       hDll = hinstDLL;

  return TRUE;

}

1 reply

L
LeoTaroCorrect answer
Inspiring
June 9, 2017

The LoadBitmap call is failing (hBmp is NULL), because you are using the application HINSTANCE rather than the one for your plugin (dll). Add a DllMain function to your plugin and store the HINSTANCE.

HINSTANCE hDll = NULL;

BOOL APIENTRY DllMain( HINSTANCE hinstDLL, DWORD ul_reason, LPVOID reserved)

{ 

  if (DLL_PROCESS_ATTACH == ul_reason)

       hDll = hinstDLL;

  return TRUE;

}

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