COMbox 句柄的一些写法。

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using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Threading;

namespace findwindow
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//################################################

//## 更多源码下载请访问 http://www.xiaoyaolife.com

//## 运行本例前,请先打开目录下的使用说明.txt

//################################################
#region 获取子窗口相关.

[DllImport("User32.dll")]
public extern static IntPtr GetWindow(IntPtr hWnd, int wCmd);

#endregion;
[DllImport("user32")]
public static extern void mouse_event(int dwFlags, int dx, int dy, int dwData, int dwExtraInfo);
[DllImport("user32.dll", EntryPoint = "SetCursorPos")]
private static extern int SetCursorPos(int x, int y);
[DllImport("user32.dll")]
private static extern int GetWindowRect(IntPtr hwnd, out Rect lpRect);
[DllImport("user32.dll")]
static extern void BlockInput(bool Block);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true, EntryPoint = "EnableWindow")]
static extern long EnableWindow(IntPtr hwnd, bool fEnable);

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

[DllImport("user32.dll", EntryPoint = "GetMenu")]
public static extern int GetMenu(int hwnd);

[DllImport("user32.dll", EntryPoint = "GetSubMenu")]
public static extern int GetSubMenu(int hMenu, int nPos);
// 键盘点击api
[DllImport("user32.dll")]
public static extern void keybd_event(Byte bVk, Byte bScan, Int32 dwFlags, Int32 dwExtraInfo);
[DllImport("user32.dll", EntryPoint = "GetMenuItemID")]
public static extern int GetMenuItemID(int hMenu, int nPos);
[DllImport("user32.dll", EntryPoint = "SetForegroundWindow", SetLastError = true)]
public static extern void SetForegroundWindow(IntPtr hwnd);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr PostMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
[DllImport("User32.dll", EntryPoint = "SendMessage")]
public static extern int SendTxtMessage(
IntPtr hWnd, // handle to destination window

int Msg, // message

IntPtr wParam, // first message parameter

char[] lParam
// int lParam // second message parameter

);
[DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hwnd, uint wMsg, int wParam, int lParam);
const int BM_CLICK = 0x111;
private readonly int MOUSEEVENTF_LEFTDOWN = 0x0002;//模拟鼠标移动
private readonly int MOUSEEVENTF_MOVE = 0x0001;//模拟鼠标左键按下
private readonly int MOUSEEVENTF_LEFTUP = 0x0004;//模拟鼠标左键抬起
private readonly int MOUSEEVENTF_ABSOLUTE = 0x8000;//鼠标绝对位置
private readonly int MOUSEEVENTF_RIGHTDOWN = 0x0008; //模拟鼠标右键按下
private readonly int MOUSEEVENTF_RIGHTUP = 0x0010; //模拟鼠标右键抬起
private readonly int MOUSEEVENTF_MIDDLEDOWN = 0x0020; //模拟鼠标中键按下
private readonly int MOUSEEVENTF_MIDDLEUP = 0x0040;// 模拟鼠标中键抬起

public struct Rect
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("User32.Dll")]
public static extern int GetDlgCtrlID(IntPtr hWndCtl);
[DllImport("user32.dll")]
public static extern bool GetComboBoxInfo(IntPtr hWnd, ref COMBOBOXINFO pcbi);

[StructLayout(LayoutKind.Sequential)]
public struct COMBOBOXINFO
{
public Int32 cbSize;
public Rect rcItem;
public Rect rcButton;
public ComboBoxButtonState buttonState;
public IntPtr hwndCombo;
public IntPtr hwndEdit;
public IntPtr hwndList;
}

public enum ComboBoxButtonState
{
STATE_SYSTEM_NONE = 0,
STATE_SYSTEM_INVISIBLE = 0x00008000,
STATE_SYSTEM_PRESSED = 0x00000008
}
private void button1_Click(object sender, EventArgs e)
{

#region 脚垫
IntPtr hWnd = FindWindow(null, "无标题 - JDPaint5.21");
Rect lpRect = new Rect();
GetWindowRect(hWnd, out lpRect);
int p1 = lpRect.Left;
int p2 = lpRect.Right;
int p3 = lpRect.Top;
int p4 = lpRect.Bottom;
int dx = 31;
int dy = 35;
SetCursorPos(lpRect.Left + dx, lpRect.Top + dy);
mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0);
mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
keybd_event((byte)Convert.ToInt32(73), 0, 0, 0);
keybd_event((byte)Convert.ToInt32(73), 0, 0x2, 0);

keybd_event((byte)Convert.ToInt32(73), 0, 0, 0);
keybd_event((byte)Convert.ToInt32(73), 0, 0x2, 0);
System.Threading.Thread.Sleep(0x3e8);
IntPtr hWnd2 = FindWindow("#32770", "输入");
IntPtr def_ImportComboBoxEx = FindWindowEx(hWnd2, 0, "ComboBoxEx32", null);
IntPtr def_ImportComboBox = FindWindowEx(def_ImportComboBoxEx, 0, "ComboBox", null);
string _forder_name = "E:\\ADQ502-1422-主料-136-倒顺+.plt";
// 向导入窗口中的Edit添加内容，获取Edit对象 .
IntPtr def_Import = FindWindowEx(def_ImportComboBox, 0, "Edit", null);
SendTxtMessage(def_Import, 0xC, IntPtr.Zero, _forder_name.ToCharArray());
IntPtr def_ComboBox = FindWindowEx(hWnd2, 0, "Static", "文件类型(&T):");
def_ComboBox = GetWindow(def_ComboBox, 2);
IntPtr hComboBox = def_ComboBox;
//ComboBox的句柄

const int CB_SETCURSEL = 0x014e;
const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
const int VK_RETURN = 0xD;

//这是可以修改成功的,只是没触发事件,但如果加上后面的代码，
Thread.Sleep(600);
SendMessage(hComboBox, CB_SETCURSEL, 8, 0);//这是可以修改成功的,只是没触发事件,但如果加上后面的代码，

///

COMBOBOXINFO cbi = new COMBOBOXINFO();

cbi.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(cbi);

if (GetComboBoxInfo(hComboBox, ref cbi))
{

//66536 消息宏（sp++消息监视WM_Commd消息）
SendMessage(hComboBox, 0x0111, 66536, (int)cbi.hwndList);

}
//
SendMessage(hComboBox, WM_KEYDOWN, VK_RETURN, 0);
Thread.Sleep(600);
SendMessage(hComboBox, WM_KEYUP, VK_RETURN, 0);

SendTxtMessage(def_ComboBox, 0xC, IntPtr.Zero, _forder_name.ToCharArray());
Thread.Sleep(600);
IntPtr def_btn = FindWindowEx(hWnd2, 0, "Button", "打开(&O)");
// SendMessage(def_btn, 0x00F5, 0, 0);
#endregion

}

private void Form1_Load(object sender, EventArgs e)
{

}
public void SelectItem(int index)
{



}

}
}

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