学习时,在网上找了一段穿透窗体的代码,感觉很不错,记录一下!!同时谢谢该作者,不过忘记了是从哪找到的了
private const uint WS_EX_LAYERED = 0x80000;
private const int WS_EX_TRANSPARENT = 0x20;
private const int GWL_STYLE = (-16);
private const int GWL_EXSTYLE = (-20);
private const int LWA_ALPHA = 0x2;
public Form1()
{
InitializeComponent();
CanPenetrate();//使窗体有鼠标穿透功能
}
[DllImport("user32", EntryPoint = "SetWindowLong")]
private static extern uint SetWindowLong(
IntPtr hwnd,
int nIndex,
uint dwNewLong
);
[DllImport("user32", EntryPoint = "GetWindowLong")]
private static extern uint GetWindowLong(
IntPtr hwnd,
int nIndex
);
[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
private static extern int SetLayeredWindowAttributes(
IntPtr hwnd,
int crKey,
int bAlpha,
int dwFlags
);
/// <summary>
/// 使窗体有鼠标穿透功能
/// </summary>
public void CanPenetrate()
{
uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE);
uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);
}
参数的意思:
hWnd是透明窗体的句柄,
crKey为掩码的颜色,可以用RGB(r,g,b)来指定。
bAlpha是不透明度,取值范围是(0,255),其中0代表全透明,255代表不透明。
dwFlags是透明方式,可以取两个值:
当取值为LWA_ALPHA时,crKey参数无效,bAlpha参数有效;
当取值为LWA_COLORKEY时,窗体中的所有颜色为crKey的地方将变为透明,bAlpha参数无效。
LWA_ALPHA = 0x2
LWA_COLORKEY=0x1
也可以取两个值的组合:LWA_ALPHA Or
LWA_COLORKEY。这样crKey的地方将变为全透明,而其它地方根据bAlpha参数确定透明度。