设置对话框的透明度

SetTransparence(int value)
{
	SetWindowLong(GetSafeHwnd(),GWL_EXSTYLE,
		GetWindowLong(GetSafeHwnd(),GWL_EXSTYLE) | 0x80000);                     //设置窗口扩展风格
	typedef BOOL (WINAPI *FSetLayeredWindowAttributes)(HWND,COLORREF,BYTE,DWORD);
	FSetLayeredWindowAttributes SetLayeredWindowAttributes;			//声明函数
	HINSTANCE hInst = LoadLibrary(_T("User32.DLL"));				//加载User32.DLL
	SetLayeredWindowAttributes = (FSetLayeredWindowAttributes)
		GetProcAddress(hInst,"SetLayeredWindowAttributes");
	if(SetLayeredWindowAttributes)
		SetLayeredWindowAttributes(GetSafeHwnd(),RGB(0,0,0),value,2);            //根据value的值设置窗体透明度
	FreeLibrary(hInst);							//释放动态链接库
}