C ++ WinAPI SetLayeredWindowAttributes和BitBlt之间的冲突 [英] C++ WinAPI Conflict between SetLayeredWindowAttributes and BitBlt

问题描述

我使用DWM创建了一个自定义窗口。我使用

添加完毕后

您有其他方法绘制标题吗？

  case WM_ACTIVATE：{
 DwmExtendFrameIntoClientArea（hWnd，& m）; // m = { -  1，-1，-1，-1}; 
 break; 
} 
 case WM_INITDIALOG：{
 SetWindowPos（hWnd，NULL，0,0500,500，SWP_NOMOVE | SWP_FRAMECHANGED）; 
 SetWindowLongPtr（hWnd，GWL_STYLE，WS_VISIBLE | WS_OVERLAPPEDWINDOW）; 
 SetWindowLongPtr（hWnd，GWL_EXSTYLE，WS_EX_LAYERED）; 
 SetLayeredWindowAttributes（hWnd，RGB（0,0,1），0，LWA_COLORKEY）; 
 RedrawWindow（hWnd，NULL，NULL，RDW_INVALIDATE | RDW_ERASE）; 
 return true; 
} 
 case WM_PAINT：{
 hdc = BeginPaint（hWnd，& paintstruct）; 
 PaintCustomCaption（hWnd，hdc）
 EndPaint（hWnd，& paintstruct）; 
 break; 
} 
  

解决方案

）作为透明度键而不是RGB（0,0,1）。

您可以尝试其他值，但它是迄今为止我测试过的最好的。 p>

然后，将 HBITMAP hbmOld =（HBITMAP）SelectObject（hdcPaint，hbm）; PaintCustomCaption（）：

  FillRect（hdcPaint，& rcClient，CreateSolidBrush（RGB（200,201,202） ））; 
  




I have created a custom window using DWM. I painted the caption by using PaintCustomCaption() ,which is an example from MSDN. It worked properly until I added SetLayeredWindowAttributes().

Window before adding

SetLayeredWindowAttributes(hWnd,RGB(0,0,1),0,LWA_COLORKEY);

After adding

I tried changing RGB values but it was still black except RGB(0,0,0).

I wonder if BitBlt() works properly.

Edited:

The reason I added SetLayeredWindowAttributes is to solve this problem

Do you have other ways to paint the caption?

case WM_ACTIVATE: {
    DwmExtendFrameIntoClientArea(hWnd,&m); // m={-1,-1,-1,-1};
    break;
}
case WM_INITDIALOG: {
    SetWindowPos(hWnd,NULL,0,0,500,500,SWP_NOMOVE|SWP_FRAMECHANGED);
    SetWindowLongPtr(hWnd,GWL_STYLE,WS_VISIBLE|WS_OVERLAPPEDWINDOW);
    SetWindowLongPtr(hWnd,GWL_EXSTYLE,WS_EX_LAYERED);
    SetLayeredWindowAttributes(hWnd,RGB(0,0,1),0,LWA_COLORKEY);
    RedrawWindow(hWnd,NULL,NULL,RDW_INVALIDATE|RDW_ERASE);
    return true;
}
case WM_PAINT: {
    hdc=BeginPaint(hWnd,&paintstruct);
    PaintCustomCaption(hWnd,hdc)
    EndPaint(hWnd,&paintstruct);
    break;
}

解决方案

First, use RGB(200,201,202) as the transparency key instead of RGB(0,0,1).

You may try other values but it is the best one so far I have tested.

Then, add this after HBITMAP hbmOld=(HBITMAP)SelectObject(hdcPaint,hbm); in PaintCustomCaption():

FillRect(hdcPaint,&rcClient,CreateSolidBrush(RGB(200,201,202)));

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