[問題] 請問 這迴圈在哪?
最近在學API
API的GetWindowText
這程式大概是 根據視窗title 來找到 該視窗介的控件
在表單上 建立一個button 就好了
我不懂的是 究竟是怎樣產生迴圈效果
讓他可以不斷執行 後面這行:
Console.WriteLine(" Contains text of contro:"+ editText);
程式是用XP的 音量控制 來測試的
程式碼:
using System;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace user32_api_test1
{
public partial class Form1 : Form
{
[DllImport("User32.dll")]
public static extern Int32 FindWindow(String lpClassName, String
lpWindowName);
[DllImport("User32.dll")]
public static extern Boolean EnumChildWindows(int hWndParent,
Delegate lpEnumFunc, int lParam);
[DllImport("User32.dll")]
public static extern Int32 GetWindowText(int hWnd, StringBuilder s,
int nMaxCount);
[DllImport("User32.dll")]
public static extern Int32 GetWindowTextLength(int hwnd);
[DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
public static extern int GetDesktopWindow();
int hWnd;
public delegate int Callback(int hWnd,int lParam);
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
}//
private void button1_Click(object sender, EventArgs e)
{
Callback myCallBack = new Callback(EnumChildGetValue);
hWnd = FindWindow(null, "主音量");
if(hWnd == 0)
{
MessageBox.Show("Please Start Calling Window Application");
}
else
{
EnumChildWindows(hWnd,myCallBack,0);
}
}
public int EnumChildGetValue(int hWnd,int lParam)
{
StringBuilder formDetails = new StringBuilder(256);
int txtValue;
string editText="";
txtValue =GetWindowText(hWnd,formDetails,256);
editText = formDetails.ToString().Trim();
Console.WriteLine(" Contains text of contro:"+ editText);
return 1;
}
}//
}
Thanks in advance for any help
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