[DllImport("User32.dll", EntryPoint = "FindWindow")]

private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll", EntryPoint = "FindWindowEx")]

private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

[DllImport("User32.dll", EntryPoint = "SendMessage")]

private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);

const int WM_GETTEXT = 0x000D;

const int WM_SETTEXT = 0x000C;

const int WM_CLICK = 0x00F5;

private void button3_Click(object sender, EventArgs e)

{

int retval = 0;

//增加一个返回值用来判断操作是否成功

//下面的这些参数都可以用Spy++查到

//string lpszParentClass = "#32770";

//整个窗口的类名

string lpszParentWindow = "Form1";

//窗口标题 string lpszClass = "WindowsForms10.EDIT.app.0.b7ab7b";

//需要查找的子窗口的类名，也就是输入框

string lpszClass_Submit = "WindowsForms10.BUTTON.app.0.b7ab7b";

//需要查找的Button的类名 string lpszName_Submit = "确定";

//需要查找的Button的标题 string text = "";

IntPtr ParenthWnd = new IntPtr(0);

IntPtr EdithWnd = new IntPtr(0);

//查到窗体，得到整个窗体

ParenthWnd = FindWindow(null, lpszParentWindow);

//判断这个窗体是否有效

if (!ParenthWnd.Equals(IntPtr.Zero))

{

     //得到User Name这个子窗体，并设置其内容

     EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, lpszClass, "");

     if (!EdithWnd.Equals(IntPtr.Zero))

     {

          text = "Book";

          //调用SendMessage方法设置其内容

          SendMessage(EdithWnd, WM_SETTEXT, (IntPtr)0, text); retval++;

     }

     //得到Password这个子窗体，并设置其内容

     EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, lpszClass, "");

     if (!EdithWnd.Equals(IntPtr.Zero))

     {

          text = "ITest";

          SendMessage(EdithWnd, WM_SETTEXT, (IntPtr)0, text); retval++;

     }

     //得到Domain这个子窗体，并设置其内容

     EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, lpszClass, "");

     if (!EdithWnd.Equals(IntPtr.Zero))

     {

          text = "Ilove";

          SendMessage(EdithWnd, WM_SETTEXT, (IntPtr)0, text); retval++;

     }

     //得到Button这个子窗体，并触发它的Click事件

     EdithWnd = FindWindowEx(ParenthWnd, (IntPtr)0, lpszClass_Submit, lpszName_Submit);

     if (!EdithWnd.Equals(IntPtr.Zero))

     {

          SendMessage(EdithWnd, WM_CLICK, (IntPtr)0, "0");

          retval++;

     } 

}