C# 创建一个无路径的记事本 并在编辑区添加字符串
C# 创建一个无路径的记事本 并在编辑区添加字符串 调试半天找不到问题所在

C# code

//引用using System.Runtime.InteropServices;using System.Diagnostics;//在类中声明外部函数        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]        internal static extern IntPtr GetFocus();        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]        internal static extern IntPtr FindWindowEx(IntPtr hWndParent, IntPtr hWndChildAfter, string lpszClass, string lpszWindow);        [DllImport("user32.dll",EntryPoint="SendMessageA")]        internal static extern int SendMessage(IntPtr hWnd, int msg, IntPtr wparam, string lparam);// 声明消息标识public const int WM_SETTEXT = 0x000C;//在Button_click事件中添加以下代码                    Process.Start("Notepad");                    IntPtr myNotePad = IntPtr.Zero;                    myNotePad = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "无标题 - 记事本", null);                    IntPtr myNote = IntPtr.Zero;                    myNote = FindWindowEx(myNotePad, IntPtr.Zero, "Edit", null);                    //SendMessage(myNote, WM_SETTEXT, IntPtr.Zero, strData);                    SendMessage(myNote, WM_SETTEXT, IntPtr.Zero, "display str");

// 现象是可以打开记事本，但不能添加字符串进去，调试时发现 myNotePad 始终=0，myNote 值是变化的六位数。

[解决办法]
click事件里内容修改如下

C# code

#region [ 启动记事本 ]                System.Diagnostics.Process Proc;                try                {                    // 启动记事本                    Proc = new System.Diagnostics.Process();                    Proc.StartInfo.FileName = "notepad.exe";                    Proc.StartInfo.UseShellExecute = false;                    Proc.StartInfo.RedirectStandardInput = true;                    Proc.StartInfo.RedirectStandardOutput = true;                    Proc.Start();                }                catch                {                    Proc = null;                }                #endregion                #region [ 传递数据给记事本 ]                if (Proc != null)                {                    // 调用 API, 传递数据                    while (Proc.MainWindowHandle == IntPtr.Zero)                    {                        Proc.Refresh();                    }                    IntPtr vHandle = FindWindowEx(Proc.MainWindowHandle, IntPtr.Zero, "Edit", null);                    // 传递数据给记事本                    SendMessage(vHandle, WM_SETTEXT, IntPtr.Zero, "display str");                }                #endregion