這段代碼很有意義,用於把一個程序的界面嵌入到我們自己程序的某個指定窗體上.
比如在某個項目裡,我需要把基恩士的激光掃描輪廓顯示給客戶看,但是激光的DLL中並沒有這種功能提供. 於是我想先啟動激光的官方程序用以顯示輪廓, 然後再把這種顯示界面嵌入到我自己程序的界面上指定的位置上.
在筆者構想的PLC仿真器由梯形圖編輯器, 3D仿真組態環境兩部分組成, 這兩部分就可以考慮開發成獨立的軟件,然後嵌入到我需要的另外的一款PLC仿真教學軟件中去.
源代碼如下:
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9 using System.Runtime.InteropServices;
10 using System.Diagnostics;
11 using System.Threading;
12
13 namespace WindowsFormsApplication1
14 {
15 public partial class Form1 : Form
16 {
17 Process p;
18
19 public Form1()
20 {
21 InitializeComponent();
22 }
23
24 #region API
25 [DllImport("user32.dll")]
26 private static extern int SetParent(IntPtr hWndChild, IntPtr hWndParent);
27
28 [DllImport("user32.dll")]
29 private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
30
31 [DllImport("user32.dll", SetLastError = true)]
32 private static extern bool PostMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
33
34 [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
35 private static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter,
36 int X, int Y, int cx, int cy, uint uFlags);
37
38 [DllImport("user32.dll")]
39 private static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
40
41 [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
42 private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint newLong);
43
44 [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
45 private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);
46
47 [DllImport("user32.dll", CharSet = CharSet.Auto)]
48 private static extern bool ShowWindow(IntPtr hWnd, short State);
49
50 private const int HWND_TOP = 0x0;
51 private const int WM_COMMAND = 0x0112;
52 private const int WM_QT_PAINT = 0xC2DC;
53 private const int WM_PAINT = 0x000F;
54 private const int WM_SIZE = 0x0005;
55 private const int SWP_FRAMECHANGED = 0x0020;
56 public enum ShowWindowStyles : short
57 {
58 SW_HIDE = 0,
59 SW_SHOWNORMAL = 1,
60 SW_NORMAL = 1,
61 SW_SHOWMINIMIZED = 2,
62 SW_SHOWMAXIMIZED = 3,
63 SW_MAXIMIZE = 3,
64 SW_SHOWNOACTIVATE = 4,
65 SW_SHOW = 5,
66 SW_MINIMIZE = 6,
67 SW_SHOWMINNOACTIVE = 7,
68 SW_SHOWNA = 8,
69 SW_RESTORE = 9,
70 SW_SHOWDEFAULT = 10,
71 SW_FORCEMINIMIZE = 11,
72 SW_MAX = 11
73 }
74 #endregion
75
76 private void Form1_Load(object sender, EventArgs e)
77 {
78 p = new Process();
79 //需要啟動的程序
80 p.StartInfo.FileName = @"calc.exe";
81 //為了美觀,啟動的時候最小化程序
82 p.StartInfo.WindowStyle = ProcessWindowStyle.Minimized;
83 //啟動
84 p.Start();
85
86 //這裡必須等待,否則啟動程序的句柄還沒有創建,不能控制程序
87 Thread.Sleep(10000);
88 //最大化啟動的程序
89 ShowWindow(p.MainWindowHandle, (short)ShowWindowStyles.SW_MAXIMIZE);
90 //設置被綁架程序的父窗口
91 SetParent(p.MainWindowHandle, this.Handle);
92 //改變尺寸
93 ResizeControl();
94 }
95
96 //控制嵌入程序的位置和尺寸
97 private void ResizeControl()
98 {
99 SendMessage(p.MainWindowHandle, WM_COMMAND, WM_PAINT, 0);
100 PostMessage(p.MainWindowHandle, WM_QT_PAINT, 0, 0);
101
102 SetWindowPos(
103 p.MainWindowHandle,
104 HWND_TOP,
105 0 - 10,//設置偏移量,把原來窗口的菜單遮住
106 0 - 32,
107 (int)this.Width + 32,
108 (int)this.Height + 32,
109 SWP_FRAMECHANGED);
110
111 SendMessage(p.MainWindowHandle, WM_COMMAND, WM_SIZE, 0);
112 }
113
114 private void Form1_SizeChanged(object sender, EventArgs e)
115 {
116 ResizeControl();
117 }
118
119 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
120 {
121 p.Kill();
122 p.Dispose();
123 }
124 }
125 }
核心功能利用了windows API中的SetParent()
程序運行後, 先啟動calc.exe(windows計算器), 然後等待10秒後再顯示本程序自己的窗體, 這時你會發現這個窗體已經把calc.exe的界面包含進來的.
這樣你就可以清楚的看到嵌入的效果是怎麼樣的.
本文源代碼
