/// <summary>
/// 清空指定窗体消息队列中的所有的消息
/// </summary>
/// <returns>删除的消息个数</returns>
public static int ClearMessage(IntPtr hwnd)
{
int result = 0;
while (true)
{
NativeMSG msg = new NativeMSG();
//if (NativeGetMessage(ref msg, hwnd, 0, 0))
//{
// result++;
//}
//else
//{
// break;
//}
if (NativePeekMessage(ref msg, hwnd, 0, 0, 0xffffff))
{
if (msg.message == 0)
{
break;
}
result++;
}
else
{
break;
}
}//while
return(result);
}
private Win32Message(NativeMSG msg)
{
_HWnd = new IntPtr(msg.hwnd);
_LParam = new IntPtr(msg.lParam);
_Msg = msg.message;
_WParam = new IntPtr(msg.wParam);
}
public static System.Drawing.Point GetMousePositionFromMSG(NativeMSG msg)
{
NativePOINT pt = new NativePOINT();
pt.x = (short)((uint)msg.lParam & 0x0000FFFFU);
pt.y = (short)(((uint)msg.lParam & 0xFFFF0000U) >> 16);
ClientToScreen(new IntPtr(msg.hwnd), ref pt);
return(new System.Drawing.Point(pt.x, pt.y));
}
/// <summary>
/// 从消息队列中获得一个消息，但不从消息队列中删除该消息
/// </summary>
/// <returns>获得的消息对象</returns>
public static Win32Message Peek()
{
NativeMSG msg = new NativeMSG();
if (NativePeekMessage(ref msg, IntPtr.Zero, 0, 0, 0))
{
return(new Win32Message(msg));
}
else
{
return(null);
}
}
/// <summary>
/// 从消息队列中获得一个消息对象,并从消息队列中删除这个消息
/// </summary>
/// <returns>获得的消息对象</returns>
public static Win32Message GetMessage()
{
NativeMSG msg = new NativeMSG();
if (NativeGetMessage(ref msg, IntPtr.Zero, 0, 0))
{
Win32Message msg2 = new Win32Message(msg);
return(msg2);
}
else
{
return(null);
}
}
[DllImport("user32", CharSet = CharSet.Ansi)] //ANSI
public static extern int DispatchMessageA(ref NativeMSG msg);
[DllImport("user32")] //ANSI
public static extern bool PeekMessageA(out NativeMSG lpMsg, int hWnd, uint wMsgFilterMin, uint wMsgFilterMax, PeekMessageFlags wRemoveMsg);
[DllImport("user32")] //ANSI
public static extern int GetMessageA(out NativeMSG msg, int hwnd, int minFilter, int maxFilter);
public static extern bool PeekMessage(ref NativeMSG msg, IntPtr hWnd, uint wFilterMin, uint wFilterMax, uint wFlag);
public static extern bool GetMessage(ref NativeMSG msg, IntPtr hWnd, uint wFilterMin, uint wFilterMax);
public static extern bool DispatchMessage(ref NativeMSG msg);
public static extern bool TranslateMessage(ref NativeMSG msg);
private static extern bool NativePeekMessage(ref NativeMSG msg, IntPtr hWnd, uint wFilterMin, uint wFilterMax, uint wFlag);
private static extern bool NativeGetMessage(ref NativeMSG msg, IntPtr hWnd, uint wFilterMin, uint wFilterMax);
