win32设置对话框的透明度

// 设置窗体的透明度iTransparetn为0~255
void Transparent(HWND hwnd, int iTransparent)
{
    HINSTANCE hInstance = LoadLibrary("User32.dll");
    // 设置窗体的扩展样式
    SetWindowLong(hwnd, GWL_EXSTYLE, 0x80000);
    if (hInstance)
    {
        typedef BOOL (WINAPI *SLWA)(HWND, COLORREF, BYTE, DWORD);
        SLWA pFun = NULL;
        // 获取函数的地址
        pFun = (SLWA)GetProcAddress(hInstance, "SetLayeredWindowAttributes");

        if (pFun)
        {
            pFun(hwnd, 0, iTransparent, 2);
        }

    }
    // 释放实例句柄
    FreeLibrary(hInstance);
}