Screen Capture

REF:http://0rz.net/3a0Gm


新聞群組： microsoft.public.dotnet.csharp.general
寄件人： "Per" - 尋找此作者的訊息
日期： Wed, 5 Jan 2005 08:35:38 +0100
當地時間： 2005年1月5日(星期三) 下午3時35分
主旨： Screen capture
回覆作者 | 轉寄 | 列印 | 顯示個別留言 | 顯示原始檔 | 舉報濫用行為

Hi all,
This may be a newbie question, but I can't find the answer anywhere.
I want to make a capture of the screen, or a part of the screen, that
contains the main portion of the form.
Detecting the screen that contain the main portion of the form is pretty
straight forward, but how do I capture what I need in an Image object?
Another thing, how do you make the program move the mouse pointer and
simulate clicks?

Best regards


Andrew Arace 1月17日 下午10時21分 顯示選項
新聞群組： microsoft.public.dotnet.csharp.general
寄件人： "Andrew Arace" - 尋找此作者的訊息
日期： 17 Jan 2005 06:21:20 -0800
當地時間： 2005年1月17日(星期一) 下午10時21分
主旨： Re: Screen capture
回覆作者 | 轉寄 | 列印 | 顯示個別留言 | 顯示原始檔 | 舉報濫用行為

I can't help you on the mouse pointer click simulation,
but i can provide you with some screen capture code:

public class ImagingUtils {

//imports the GDI BitBlt function that enables the background
of the window
//to be captured
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // handle to destination DC
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
IntPtr hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
);

[System.Runtime.InteropServices.DllImport("User32.dll")]
public extern static System.IntPtr GetDC(System.IntPtr hWnd);

[System.Runtime.InteropServices.DllImport("User32.dll")]
public extern static int ReleaseDC(System.IntPtr hWnd,
System.IntPtr hDC); //modified to include hWnd

///

/// Returns a full desktop screencapture
///

/// A Bitmap object capture of the entire
desktop.
public static Image GetScreenCapture() {
System.IntPtr desktopDC = GetDC(System.IntPtr.Zero);
Bitmap bm = new
Bitmap(System.Windows.Forms.SystemInformation.VirtualScreen.Width,

System.Windows.Forms.SystemInformation.VirtualScreen.Height);
Graphics g = Graphics.FromImage(bm);
System.IntPtr bmDC = g.GetHdc();
BitBlt(bmDC, 0, 0, bm.Width,bm.Height, desktopDC, 0, 0,
0x00CC0020 /*SRCCOPY*/);
ReleaseDC(System.IntPtr.Zero, desktopDC);
g.ReleaseHdc(bmDC);
g.Dispose();
return bm;

}

///

/// Returns a capture of the control's current graphics.
///

/// The winforms control to capture
/// A Bitmap object of the captured graphics
public static Image
GetControlImageCapture(System.Windows.Forms.Control ctrl) {
System.IntPtr ctrlCapture = GetDC(ctrl.Handle);
Bitmap bm = new Bitmap(ctrl.Width,
ctrl.Height);
Graphics g = Graphics.FromImage(bm);
System.IntPtr bmDC = g.GetHdc();
BitBlt(bmDC, 0, 0, bm.Width, bm.Height, ctrlCapture, 0, 0,
0x00CC0020 /*SRCCOPY*/);
ReleaseDC(ctrl.Handle, ctrlCapture);
g.ReleaseHdc(bmDC);
g.Dispose();
return bm;
}

}

.Net code to Detect When an External Drive is Mounted?

REF: http://0rz.net/530xD

Here you go. I know that this code works for CD removal/insertion. I
haven't tested it for other devices, but it really ought to work.

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace Whatever {

public class HookEventArgs : EventArgs {
public int HookCode;
public IntPtr wParam;
public IntPtr lParam;

}

// Hook Types
public enum HookType : int {
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
WH_KEYBOARD = 2,
WH_GETMESSAGE = 3,
WH_CALLWNDPROC = 4,
WH_CBT = 5,
WH_SYSMSGFILTER = 6,
WH_MOUSE = 7,
WH_HARDWARE = 8,
WH_DEBUG = 9,
WH_SHELL = 10,
WH_FOREGROUNDIDLE = 11,
WH_CALLWNDPROCRET = 12,
WH_KEYBOARD_LL = 13,
WH_MOUSE_LL = 14

}

///

/// Summary description for Win32Hooks.
///

public class Win32Hook {

public delegate int HookProc(int code, IntPtr wParam, IntPtr
lParam);

protected IntPtr m_hhook = IntPtr.Zero;
protected HookProc m_filterFunc = null;
protected HookType m_hookType;

public delegate void HookEventHandler(object sender, HookEventArgs
e);

public event HookEventHandler HookInvoked;
protected void OnHookInvoked(HookEventArgs e) {
if (HookInvoked != null) {
HookInvoked(this, e);

}
}

public Win32Hook(HookType hook) {
m_hookType = hook;
m_filterFunc = new HookProc(this.CoreHookProc);
}

public Win32Hook(HookType hook, HookProc func) {
m_hookType = hook;
m_filterFunc = func;

}

public int CoreHookProc(int code, IntPtr wParam, IntPtr lParam) {

if (code < 0) {
return CallNextHookEx(m_hhook, code, wParam, lParam);

}

HookEventArgs e = new HookEventArgs();
e.HookCode = code;
e.wParam = wParam;
e.lParam = lParam;
OnHookInvoked(e);

return CallNextHookEx(m_hhook, code, wParam, lParam);

} // CoreHookProc

public void Install() {

m_hhook = SetWindowsHookEx(m_hookType, m_filterFunc, IntPtr.Zero,
(int) AppDomain.GetCurrentThreadId());

}

public void Uninstall() {
UnhookWindowsHookEx(m_hhook);

}

#region Win32 Imports
[DllImport("user32.dll")]
protected static extern IntPtr SetWindowsHookEx(HookType code,
HookProc func, IntPtr hInstance, int threadID);

[DllImport("user32.dll")]
protected static extern int UnhookWindowsHookEx(IntPtr hhook);

[DllImport("user32.dll")]
protected static extern int CallNextHookEx(IntPtr hhook, int code,
IntPtr wParam, IntPtr lParam);
#endregion

}

public class DeviceChangeEventArgs {
public string drive;
public DirectoryInfo driveInfo;
public IntPtr eventHwnd;

}

public class DeviceChangeHook : Win32Hook {
const int WM_DEVICECHANGE = 0x0219;
private static IntPtr _forHWnd;
public static IntPtr ForHWnd {
get {
return DeviceChangeHook._forHWnd;

}

set {
DeviceChangeHook._forHWnd = value;

}
}

protected enum DbtHookActions {
DeviceArrival = 0x8000,
DeviceRemoveComplete = 0x8004

}

[StructLayout(LayoutKind.Sequential)]
protected class DevBroadcastVolume {
public int dbcv_size;
public int dbcv_devicetype;
public int dbcv_reserved;
public int dbcv_unitmask;
public short dbcv_flags;

}

// class cwp maps the unmanaged Win32 struct CWPSTRUCT that is
declared in
// winuser.h
// See
http://msdn.microsoft.com/libr ary/default.asp?url=/library/e n-us/winu...
[StructLayout(LayoutKind.Sequential)]
protected class cwp {
public IntPtr lParam;
public int wParam;
public ushort message;
public IntPtr hwnd;

}

public delegate void DeviceChangeEventHandler(object sender,
DeviceChangeEventArgs dce);
public event DeviceChangeEventHandler DeviceArrived;
public event DeviceChangeEventHandler DeviceRemoved;

static DeviceChangeHook() {
DeviceChangeHook._forHWnd = IntPtr.Zero;

}

public DeviceChangeHook() : base(HookType.WH_CALLWNDPROC) {
this.HookInvoked += new HookEventHandler(GetMessageHookInvoked);

}

public DeviceChangeHook(HookProc func) :
base(HookType.WH_CALLWNDPROC, func) {
this.HookInvoked += new HookEventHandler(GetMessageHookInvoked);

}

private void GetMessageHookInvoked(object sender, HookEventArgs he)
{

cwp eventMessage = new cwp();
eventMessage = (cwp) Marshal.PtrToStructure(he.lParam,
eventMessage.GetType());
if ((eventMessage.message == 0x0219) && (eventMessage.hwnd ==
DeviceChangeHook._forHWnd)) {
DbtHookActions action = (DbtHookActions) eventMessage.wParam;
DevBroadcastVolume eventInfo = new DevBroadcastVolume();
eventInfo = (DevBroadcastVolume)
Marshal.PtrToStructure(eventMessage.lParam, eventInfo.GetType());

DeviceChangeEventArgs changeArgs = new DeviceChangeEventArgs();

switch (action) {
case DbtHookActions.DeviceArrival:
changeArgs.drive =
decodeDriveLetter(eventInfo.dbcv_unitmask);
changeArgs.driveInfo = new DirectoryInfo(changeArgs.drive +
":\\");
changeArgs.eventHwnd = eventMessage.hwnd;
DeviceArrived(this, changeArgs);
break;
case DbtHookActions.DeviceRemoveComplete:
changeArgs.drive =
decodeDriveLetter(eventInfo.dbcv_unitmask);
changeArgs.driveInfo = null;
changeArgs.eventHwnd = eventMessage.hwnd;
DeviceRemoved(this, changeArgs);
break;
default:
break;

} // switch
}
} // GetMessageHookInvoked

protected string decodeDriveLetter(int unitMask) {

char driveLetter;
for (driveLetter = 'A'; driveLetter <= 'Z'; ++driveLetter) {
if ((unitMask & 0x1) == 0x1)
break;
unitMask = unitMask >> 1;

}

if (driveLetter > 'Z') // Catch any unitMask failure
driveLetter = '0';

return driveLetter.ToString();

screen capture

Ref: http://0rz.net/e70yC

I can't help you on the mouse pointer click simulation,
but i can provide you with some screen capture code:

public class ImagingUtils {

//imports the GDI BitBlt function that enables the background
of the window
//to be captured
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // handle to destination DC
int nXDest, // x-coord of destination upper-left corner
int nYDest, // y-coord of destination upper-left corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
IntPtr hdcSrc, // handle to source DC
int nXSrc, // x-coordinate of source upper-left corner
int nYSrc, // y-coordinate of source upper-left corner
System.Int32 dwRop // raster operation code
);

[System.Runtime.InteropServices.DllImport("User32.dll")]
public extern static System.IntPtr GetDC(System.IntPtr hWnd);

[System.Runtime.InteropServices.DllImport("User32.dll")]
public extern static int ReleaseDC(System.IntPtr hWnd,
System.IntPtr hDC); //modified to include hWnd

///

/// Returns a full desktop screencapture
///

/// A Bitmap object capture of the entire
desktop.
public static Image GetScreenCapture() {
System.IntPtr desktopDC = GetDC(System.IntPtr.Zero);
Bitmap bm = new
Bitmap(System.Windows.Forms.SystemInformation.VirtualScreen.Width,

System.Windows.Forms.SystemInformation.VirtualScreen.Height);
Graphics g = Graphics.FromImage(bm);
System.IntPtr bmDC = g.GetHdc();
BitBlt(bmDC, 0, 0, bm.Width,bm.Height, desktopDC, 0, 0,
0x00CC0020 /*SRCCOPY*/);
ReleaseDC(System.IntPtr.Zero, desktopDC);
g.ReleaseHdc(bmDC);
g.Dispose();
return bm;

}

///

/// Returns a capture of the control's current graphics.
///

/// The winforms control to capture
/// A Bitmap object of the captured graphics
public static Image
GetControlImageCapture(System.Windows.Forms.Control ctrl) {
System.IntPtr ctrlCapture = GetDC(ctrl.Handle);
Bitmap bm = new Bitmap(ctrl.Width,
ctrl.Height);
Graphics g = Graphics.FromImage(bm);
System.IntPtr bmDC = g.GetHdc();
BitBlt(bmDC, 0, 0, bm.Width, bm.Height, ctrlCapture, 0, 0,
0x00CC0020 /*SRCCOPY*/);
ReleaseDC(ctrl.Handle, ctrlCapture);
g.ReleaseHdc(bmDC);
g.Dispose();
return bm;
}

}

Re: 取用別人的網頁

作者: chavy (chavy) 看板: C_Sharp
標題: Re: 取用別人的網頁
時間: Sun May 22 17:15:01 2005

※ 引述《ganymade (呀)》之銘言：
: 我想寫一個web application
: 用來處理一些棒球的計算問題
: 可是在那之前
: 我建資料庫需要抓很多CPBL的資料
: 例如在下面這一頁
: http://www.cpbl.com.tw/personal_Rec/
: Per_year_Hit.asp?Pno=EC1&qYear=2001&team=E01
: 縮一下網址：http://tinyurl.com/chrc4
: 因為要抓所有球員的一壘安打、二壘安打.........
: 很多很多
: 都是在這頁裡
: 那有沒有比較簡單的方法
: 看上面的那網址(沒縮的)
: 至少同一個球員，只要改Year=2001 2002
: 就可以抓了
: 不過我的問題是卡在
: 怎麼樣去抓取那個網頁裡的資料呢？
可以用System.Net.WebRequest類別來抓
詳細用法請參考SDK文件

內容抓回來之後再使用System.Text.RegularExpressions.Regex類別處理
透過RegularExpression把你需要的資料擷取出來

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