#define LWA_COLORKEY 0x00000001 //方式 #define WS_EX_LAYERED 0x00080000 typedef BOOL (WINAPI *lpfnSetLayeredWindowAttributes)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags); lpfnSetLayeredWindowAttributes SetLayeredWindowAttributes; //设置成边缘透明 COLORREF maskColor=RGB(0,0,0); HMODULE hUser32 = GetModuleHandle("user32.dll"); //加载动态链接库 SetLayeredWindowAttributes = (lpfnSetLayeredWindowAttributes)GetProcAddress(hUser32,"SetLayeredWindowAttributes"); //取得SetLayeredWindowAttributes函数指针 //为窗口加入WS_EX_LAYERED扩展属性 SetWindowLong(this->GetSafeHwnd(), GWL_EXSTYLE, GetWindowLong(GetSafeHwnd(), GWL_EXSTYLE)^WS_EX_LAYERED); //调用SetLayeredWinowAttributes函数 SetLayeredWindowAttributes(this->GetSafeHwnd(), maskColor, 192, LWA_COLORKEY); //释放动态链接库 FreeLibrary(hUser32);
以上代码加入OnInitDialog()中,其中SetLayeredWindowAttributes(this->GetSafeHwnd(), maskColor, 192, LWA_COLORKEY);里,maskColor为将进行透明处理的颜色, 192为透明度, LWA_COLORKEY为透明方式。
若要透明整个对话框,则LWA_COLORKEY=2;
若要对选定颜色透明,则LWA_COLORKEY=1;