在C#如何调用API函数:SendMessage??????????(50分)

在C#如何调用API函数:SendMessage??????????

如果，你想用Api函数的话，最好先把它统一封装在一个类中，就象下面这样。（已经封装了SendMessage API函数）

public class User32
{
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int newLong);

[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam, ref int bRetValue, uint fWinINI);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool AnimateWindow(IntPtr hWnd, uint dwTime, uint dwFlags);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool InvalidateRect(IntPtr hWnd, ref RECT rect, bool erase);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr LoadCursor(IntPtr hInstance, uint cursor);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetCursor(IntPtr hCursor);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr GetFocus();
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetFocus(IntPtr hWnd);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool ReleaseCapture();
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool WaitMessage();
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool TranslateMessage(ref MSG msg);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool DispatchMessage(ref MSG msg);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern uint SendMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool GetMessage(ref MSG msg, int hWnd, uint wFilterMin, uint wFilterMax);

[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool PeekMessage(ref MSG msg, int hWnd, uint wFilterMin, uint wFilterMax, uint wFlag);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr begin
Paint(IntPtr hWnd, ref PAINTSTRUCT ps);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT ps);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern int ShowWindow(IntPtr hWnd, short cmdShow);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool MoveWindow(IntPtr hWnd, int x, int y, int width, int height, bool repaint);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndAfter, int X, int Y, int Width, int Height, uint flags);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref POINT pptDst, ref SIZE psize, IntPtr hdcSrc, ref POINT pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool GetWindowRect(IntPtr hWnd, ref RECT rect);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool ClientToScreen(IntPtr hWnd, ref POINT pt);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool ScreenToClient(IntPtr hWnd, ref POINT pt);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENTS tme);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool redraw);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern ushort GetKeyState(int virtKey);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr GetParent(IntPtr hWnd);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool DrawFocusRect(IntPtr hWnd, ref RECT rect);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool HideCaret(IntPtr hWnd);
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern bool ShowCaret(IntPtr hWnd);
}

有点晕!

只要在程序中加入两行：
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern uint SendMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);