C#，怎么获取其他窗体对象

using System;

using SystemCollectionsGeneric;

using SystemText;

using SystemDiagnostics;

using SystemRuntimeInteropServices;

namespace ConsoleApplication1

{

class Program

{

/// <summary>

/// 激活并前置

/// </summary>

/// <param name="hWnd"></param>

/// <returns></returns>

[DllImport("user32dll")]

public static extern bool SetForegroundWindow(IntPtr hWnd);

/// <summary>

/// 显示窗体

/// </summary>

/// <param name="hwnd"></param>

/// <param name="nCmdShow"></param>

/// <returns></returns>

[DllImport("user32dll", CharSet = CharSetAuto, ExactSpelling = true)]

public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);

//nCmdShow的含义

//0 关闭窗口

//1 正常大小显示窗口

//2 最小化窗口

//3 最大化窗口

static void Main(string[] args)

{

ConsoleTitle = "通过进程寻找记事本 显示 激活";

while (true)

{

ConsoleWriteLine("按字母g试试");

string s = ConsoleReadLine();

if (s == "g")

doSomeThing();

}

}

/// <summary>

/// 做点什么

/// </summary>

static void doSomeThing()

{

Process[] myprocess = ProcessGetProcessesByName("notepad");

foreach (Process p in myprocess)

{

IntPtr hWnd = pMainWindowHandle;

ShowWindow(hWnd, 1);

SetForegroundWindow(hWnd);

}

}

}

}

句柄，是整个Windows编程的基础。一个句柄是指使用的一个唯一的整数值，即一个4字节(64位程序中为8字节)长的数值，来标识应用程序中的不同对象和同类中的不同的实例，诸如，一个窗口，按钮，图标，滚动条，输出设备，控件或者文件等。

通俗的来讲，句柄是一个ID。我们可以利用这个ID *** 作这个ID所绑定的空间，对象等。

比较常见的句柄，比如：HINSTANCE（实例句柄），HBITMAP（位图句柄），HDC（设备描述表句柄），HICON（图标句柄）等等。

我们利用这些句柄 *** 作对象，，设备等等。

[DllImport("user32dll", EntryPoint = "FindWindow", CharSet = CharSetAuto)]

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

[DllImport("user32dll", EntryPoint = "FindWindowEx", CharSet = CharSetAuto)]

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

[STAThread]

static void Main(string[] args)

{

string path = "\\\\\\AUT3\\bin\\Debug\\AUT3exe";

Process p = ProcessStart(path);

if (p==null)

ConsoleWriteLine("Warning:process may already exist");

ConsoleWriteLine("Finding main window handle");

IntPtr mwh = FindMainWindowHandle("Form1", 100, 25);

ConsoleWriteLine("Handle to main window is " + mwh);

//有名字控件句柄

ConsoleWriteLine("Findding handle to textbox1");

IntPtr tb = FindWindowEx(mwh, IntPtrZero, null, "<enter color>");

if (tb == IntPtrZero)

throw new Exception("Unable to find textbox1");

else

ConsoleWriteLine("Handle to textbox1 is " + tb);

ConsoleWriteLine("Findding handle to button1");

IntPtr butt = FindWindowEx(mwh, IntPtrZero, null, "button1");

if (butt == IntPtrZero)

throw new Exception("Unable to find button1");

else

ConsoleWriteLine("Handle to button1 is " + butt);

//没有名字或者重名控件

ConsoleWriteLine("Findding handle to listbox1");

IntPtr lb = FindWindowByIndex(mwh,3);

if (lb == IntPtrZero)

throw new Exception("Unable to find listbox1");

else

ConsoleWriteLine("Handle to listbox1 is " + lb);

}

方法：

//通过索引查找相应控件句柄

static IntPtr FindWindowByIndex(IntPtr hwndParent,int index)

{

if (index == 0)

{

return hwndParent;

}

else

{

int ct = 0;

IntPtr result = IntPtrZero;

do

{

result = FindWindowEx(hwndParent,result,null,null);

if (result != IntPtrZero)

{

++ct;

}

} while (ct<index&&result!=IntPtrZero);

return result;

}

}

//获得待测程序主窗体句柄

private static IntPtr FindMainWindowHandle(string caption,int delay,int maxTries)

{

IntPtr mwh = IntPtrZero;

bool formFound = false;

int attempts = 0;

while (!formFound && attempts < maxTries)

{

if (mwh == IntPtrZero)

{

ConsoleWriteLine("Form not yet found");

ThreadSleep(delay);

++attempts;

mwh = FindWindow(null, caption);

}

else

{

ConsoleWriteLine("Form has been found");

formFound = true;

}

}

if (mwh == IntPtrZero)

throw new Exception("Could not find main window");

else

return mwh;

}

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