问题描述
所以，我有一个WINDOWCLASSX，我想设置的背景，包括alpha通道，但我只看到一个RGB宏;没有RGBA。
So, I have a WINDOWCLASSX that I want to set the background to, including the alpha channel, but I only saw an "RGB" macro; no RGBA.
那么如何在hbrBackground上设置alpha呢？这是我的代码：
So how do I set alpha on hbrBackground? Here is my code:
WNDCLASSEX wincl;
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;
wincl.style = CS_DBLCLKS;
wincl.cbSize = sizeof (WNDCLASSEX);
wincl.hIcon = LoadIcon (GetModuleHandle(0), MAKEINTRESOURCE(IDI_MYAPP));
wincl.hIconSm = LoadIcon (GetModuleHandle(0), MAKEINTRESOURCE(IDI_MYAPP));
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = MAKEINTRESOURCE(IDR_MAINFRAME);
wincl.cbClsExtra = 0;
wincl.cbWndExtra = 0;
wincl.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
在最后一行，我想要设置alpha。
On that last line, I want to be able to set alpha.
- 感谢任何帮助。
-Thanks for any help.
推荐答案
窗口类。您必须将 WS_EX_LAYERED 样式应用于窗口，然后使用 SetLayeredWindowAttributes（）或 UpdateLayeredWindow（）设置窗口的Alpha通道。有关详细信息，请阅读MSDN文档：
You cannot create an alpha channel using a background brush on the window class. You have to apply the WS_EX_LAYERED style to the window instead and then use either SetLayeredWindowAttributes() or UpdateLayeredWindow() to set the window's alpha channel. Read the MSDN documentation for more details:
这篇关于如何设置WINDOWCLASSX hbrBackground alpha通道？ （C ++）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！