C#給其他程式發訊息

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1、相關聲明函數，SendMessage可定義兩種格式。

[DllImport("User32.DLL", CharSet = CharSet.Auto)]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

 

[DllImport("User32.dll")]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

 

[DllImport("User32.DLL")]
public static extern int SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);
[DllImport("User32.DLL")]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, string lParam);

 

[DllImport("user32.dll")]
public static extern IntPtr PostMessage(IntPtr hwnd, int wMsg, IntPtr wParam, string lParam);

 

2、相關訊息

public const uint WM_SETTEXT = 0x000C;

public const uint WM_CHAR = 0x0102;

public const uint EM_SETSEL = 0x00B1;

 

3、
用spy++觀察是哪個視窗處理訊息，然後用FindWindow找到視窗控制代碼
IntPtr main = FindWindow("TFrmMain", null);

或
自己啟動，比如記事本
Process vProcess = Process.Start("notepad.exe");
while (vProcess.MainWindowHandle == IntPtr.Zero) vProcess.Refresh();
註：啟動之後可以直接發索引值
SendKeys.Send("01234/n");SendKeys.Send("56789/n");

或
枚舉所有進程
Process[] vP2 = Process.GetProcesses();

 

用FindWindowEx找子視窗控制代碼，一層層找下去。
IntPtr panel1 = FindWindowEx(main, IntPtr.Zero, "TPanel", null);
IntPtr panel2 = FindWindowEx(panel1, IntPtr.Zero, "TPanel", null);

 

如果有多個同類子視窗，FindWindowEx第二個參數，控制從哪個子視窗開始找何開始找。
IntPtr edit1 = FindWindowEx(panel2, (IntPtr)null, "TEdit", null);
IntPtr edit2 = FindWindowEx(panel2, edit1, "TEdit", null);

 

逐個發訊息
SendMessage(edit1, WM_CHAR, (uint)Keys.F3, 0);

 

用迴圈發
string end="hello";
for(int i=0;i<5;i++)
  SendMessage(edit1, WM_CHAR, (uint)end[i], 0);

 

發字串
SendMessage(vHandle, WM_SETTEXT, IntPtr.Zero, "測試/r/n換行");

 

選中7個文本
SendMessage(vHandle, EM_SETSEL, 0, 7);

C#給其他程式發訊息