- C# code
using System;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
namespace GDBranchPlatDLP
{
/// <summary>
/// clsCaptureDesktop 的摘要说明。
/// </summary>
public class clsCaptureDesktop
{
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, //目标设备的句柄
int nXDest, //目标对像的左上角的X坐标
int nYDest, //目标对象的左上角的Y坐标
int nWidth, //目标对象的矩形的宽度
int nHeight, //目标对象的矩形的长度
IntPtr hdcSrc, //源设备的句柄
int nXSrc, //源对像的左上角的X坐标
int nYSrc, //源对象的左上角的Yw坐标
System.Int32 dwRop //光栅的操作值
);
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
private static extern IntPtr CreateDC(
string lpszDriver, // 驱动名称
string lpszDevice, // 设备名称
string lpszOutput, // 无用，可以设定位"NULL"
IntPtr lpInitData // 任意的打印机数据
);
public Bitmap Capture(Size size)
{
Bitmap bmpDeskTop = null;
ArrayList arryHideWidow=new ArrayList(); //记录隐藏的窗体，以便恢复过来
foreach(Window w in new Windows()) //枚举所有窗体
{
arryHideWidow.Add(w);
w.Visible=false; //隐藏所有窗口(包括活动的和非活动的)
}
try
{
IntPtr dc1=CreateDC("DISPLAY",null,null,(IntPtr)null);
//创建显示器的DC
Graphics g1=Graphics.FromHdc(dc1);
//由一个指定的设备的句柄创建一个新的Graphics对象
bmpDeskTop = new Bitmap(Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height,g1);
//根据屏幕大小创建一个与之相同大小的Bitmap对象
Graphics g2=Graphics.FromImage(bmpDeskTop);
//获得屏幕的句柄
IntPtr dc3=g1.GetHdc();
//获得位图的句柄
IntPtr dc2=g2.GetHdc();
//把当前屏幕捕获到位图对象中
BitBlt(dc2,0,0,Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height,dc3,0,0,13369376);
//把当前屏幕拷贝到位图中
g1.ReleaseHdc(dc3);
//释放屏幕句柄
g2.ReleaseHdc(dc2);
g1.Dispose();
g2.Dispose();
}
catch
{
}
//释放位图句柄
foreach(Window w in arryHideWidow)
{
w.Visible=true; //恢复隐藏的窗口
}
Bitmap bmpRet=new Bitmap(bmpDeskTop,size);
bmpDeskTop.Dispose();
bmpDeskTop=null;
return bmpRet;
}
public clsCaptureDesktop()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
}
public class Window
{
///
/// Win32 API Imports
///
[DllImport("user32.dll")] private static extern
bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll")] private static extern
bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
bool IsIconic(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
bool IsZoomed(IntPtr hWnd);
[DllImport("user32.dll")] private static extern
IntPtr GetForegroundWindow();
[DllImport("user32.dll")] private static extern
IntPtr GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);
[DllImport("user32.dll")] private static extern
IntPtr AttachThreadInput(IntPtr idAttach, IntPtr idAttachTo, int fAttach);
///
/// Win32 API Constants for ShowWindowAsync()
///
private const int SW_HIDE = 0;
private const int SW_SHOWNORMAL = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;
///
/// Private Fields
///
private IntPtr m_hWnd;
private string m_Title;
private bool m_Visible = true;
private string m_Process;
private bool m_WasMax = false;
///
/// Window Object's Public Properties
///
public IntPtr hWnd
{
get{return m_hWnd;}
}
public string Title
{
get{return m_Title;}
}
public string Process
{
get{return m_Process;}
}
///
/// Sets this Window Object's visibility
///
public bool Visible
{
get{return m_Visible;}
set
{
//show the window
if(value == true)
{
if(m_WasMax)
{
if(ShowWindowAsync(m_hWnd,SW_SHOWMAXIMIZED))
m_Visible = true;
}
else
{
if(ShowWindowAsync(m_hWnd,SW_SHOWNORMAL))
m_Visible = true;
}
}
//hide the window
if(value == false)
{
m_WasMax = IsZoomed(m_hWnd);
if(ShowWindowAsync(m_hWnd,SW_HIDE))
m_Visible = false;
}
}
}
///
/// Constructs a Window Object
///
/// Title Caption
/// Handle
/// Owning Process
public Window(string Title, IntPtr hWnd, string Process)
{
m_Title = Title;
m_hWnd = hWnd;
m_Process = Process;
}
//Override ToString()
public override string ToString()
{
//return the title if it has one, if not return the process name
if (m_Title.Length > 0)
{
return m_Title;
}
else
{
return m_Process;
}
}
///
/// Sets focus to this Window Object
///
public void Activate()
{
if(m_hWnd == GetForegroundWindow())
return;
IntPtr ThreadID1 = GetWindowThreadProcessId(GetForegroundWindow(),
IntPtr.Zero);
IntPtr ThreadID2 = GetWindowThreadProcessId(m_hWnd,IntPtr.Zero);
if (ThreadID1 != ThreadID2)
{
AttachThreadInput(ThreadID1,ThreadID2,1);
SetForegroundWindow(m_hWnd);
AttachThreadInput(ThreadID1,ThreadID2,0);
}
else
{
SetForegroundWindow(m_hWnd);
}
if (IsIconic(m_hWnd))
{
ShowWindowAsync(m_hWnd,SW_RESTORE);
}
else
{
ShowWindowAsync(m_hWnd,SW_SHOWNORMAL);
}
}
}
///
/// Collection used to enumerate Window Objects
///
public class Windows : IEnumerable, IEnumerator
{
///
/// Win32 API Imports
///
[DllImport("user32.dll")] private static extern
int GetWindowText(int hWnd, StringBuilder title, int size);
[DllImport("user32.dll")] private static extern
int GetWindowModuleFileName(int hWnd, StringBuilder title, int size);
[DllImport("user32.dll")] private static extern
int EnumWindows(EnumWindowsProc ewp, int lParam);
[DllImport("user32.dll")] private static extern
bool IsWindowVisible(int hWnd);
//delegate used for EnumWindows() callback function
public delegate bool EnumWindowsProc(int hWnd, int lParam);
private int m_Position = -1; // holds current index of wndArray,
// necessary for IEnumerable
ArrayList wndArray = new ArrayList(); //array of windows
//Object's private fields
private bool m_invisible = false;
private bool m_notitle = false;
///
/// Collection Constructor with additional options
///
/// Include invisible Windows
/// Include untitled Windows
public Windows(bool Invisible, bool Untitled)
{
m_invisible = Invisible;
m_notitle = Untitled;
//Declare a callback delegate for EnumWindows() API call
EnumWindowsProc ewp = new EnumWindowsProc(EvalWindow);
//Enumerate all Windows
EnumWindows(ewp, 0);
}
///
/// Collection Constructor
///
public Windows()
{
//Declare a callback delegate for EnumWindows() API call
EnumWindowsProc ewp = new EnumWindowsProc(EvalWindow);
//Enumerate all Windows
EnumWindows(ewp, 0);
}
//EnumWindows CALLBACK function
private bool EvalWindow(int hWnd, int lParam)
{
if (m_invisible == false && !IsWindowVisible(hWnd))
return(true);
StringBuilder title = new StringBuilder(256);
StringBuilder module = new StringBuilder(256);
GetWindowModuleFileName(hWnd, module, 256);
GetWindowText(hWnd, title, 256);
if (m_notitle == false && title.Length == 0)
return(true);
wndArray.Add(new Window(title.ToString(), (IntPtr)hWnd,
module.ToString()));
return(true);
}
//implement IEnumerable
public IEnumerator GetEnumerator()
{
return (IEnumerator)this;
}
//implement IEnumerator
public bool MoveNext()
{
m_Position++;
if (m_Position < wndArray.Count)
{
return true;
}
else
{
return false;
}
}
public void Reset()
{
m_Position = -1;
}
public object Current
{
get
{
return wndArray[m_Position];
}
}
}
}
这段代码是抓取桌面图像的，你可以参考一下，把不是活动窗口隐藏，活动窗口不隐藏，应该可以实现你的需求
调用clsCaptureDesktop类的Capture方法
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