After using DWM, the button text becomes transparent

Question

After using DWM, the button text becomes transparent

I am using plain C and here is the code:

Creating a button:

HWND hBTN = CreateWindow(_T("button"), _T("AAasfasdfdsa"), WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON, 10, 10, 100, 100, hWnd, NULL, hInst, NULL);

Calling the DWM function:

DWM_BLURBEHIND bb = { 0 };
bb.dwFlags = DWM_BB_ENABLE;
bb.fEnable = true;
bb.hRgnBlur = NULL;
MARGINS margins = { -1, -1, -1, -1 };
DwmExtendFrameIntoClientArea(hWnd, &margins);

the image demonstrates:

enter image description here

+3

c windows winapi dwm

markable June 29. '15 at 8:45

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1 answer

William chan · Answer 1 · 2015-10-05T11:09:28+0000

The text becomes transparent because black is treated as a transparency key.

Therefore, you just need to set another transparency key for the window:

SetWindowLong(hWnd,GWL_EXSTYLE,WS_EX_LAYERED);
SetLayeredWindowAttributes(hWnd,RGB(200,201,202),0,LWA_COLORKEY);

After using DWM, the button text becomes transparent

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