/Skimpt3/Skimpt3/classes/skImageCapture.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Drawing;

using System.Windows.Forms;



namespace Skimpt3.classes {

    class skImageCapture {

      



        /// Intro to DCs:  

        /// If you are familiar, skip ahead. If not, read on.

        /// Device contexts are just generic ways to represent devices,

        /// or things you can draw on or interact with graphically. 

        /// This is hugely over simplified, and I'm going to get flamed, but for the sake of brevity,

        /// let's just go with that for now. You can get device context's, or dc's as 

        /// they are commonly referred to, from images, windows, monitors, and even printers. 

        /// Every window has them, and you can use them to draw with. Everything you see on your screen is being 

        /// drawn upon a device context. The desktop, every window, your taskbar, and anything you see. 

        /// You can draw upon them, or copy what they have drawn upon them. If you can get a hold of them, 

        /// you can pretty much draw or steal whatever you want graphically speaking. 

        /// Working with device contexts is fast, and both GDI and GDI+ are based on them.

        /// in the case of capturing the screen, we know that somewhere Windows is drawing upon a device context, so that we can see it. 

        /// In fact, there's one for each monitor you have attached to your system, and that desktop that you are seeing on it, 

        /// is being drawn on that monitor's device context. 

        /// All we have to do is grab a hold of that device context, create another one of our own, 

        /// and copy the screen's device context image data to our own, and we've got a screen capture

        /// 

        public static Bitmap GetDesktopWindowCaptureAsBitmap()

    {

        //SEE HOW THIS FUNCTION WORKS AT THE END OF THIS FUNCTION.

        Rectangle rcScreen = Rectangle.Empty;

        Screen[] screens = Screen.AllScreens;





        // Create a rectangle encompassing all screens...

        foreach (Screen screen in Screen.AllScreens)

            rcScreen = Rectangle.Union(rcScreen, screen.Bounds);



        // Create a composite bitmap of the size of all screens...

        Bitmap finalBitmap = new Bitmap(rcScreen.Width, rcScreen.Height);



        // Get a graphics object for the composite bitmap and initialize it...

        Graphics g = Graphics.FromImage(finalBitmap);

        g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;

        g.FillRectangle(

           SystemBrushes.Desktop,

           0,

           0,

           rcScreen.Width - rcScreen.X,

           rcScreen.Height - rcScreen.Y);



        // Get an HDC for the composite area...

        IntPtr hdcDestination = g.GetHdc();



        // Now, loop through screens, 

        // Blting each to the composite HDC created above...

        foreach (Screen screen in Screen.AllScreens)

        {

            // Create DC for each source monitor...

            IntPtr hdcSource = Win32.CreateDC(

              IntPtr.Zero,

              screen.DeviceName,

              IntPtr.Zero,

              IntPtr.Zero);



            // Blt the source directly to the composite destination...

            int xDest = screen.Bounds.X - rcScreen.X;

            int yDest = screen.Bounds.Y - rcScreen.Y;



            bool success = Win32.StretchBlt(

              hdcDestination,

              xDest,

              yDest,

              screen.Bounds.Width,

              screen.Bounds.Height,

              hdcSource,

              0,

              0,

              screen.Bounds.Width,

              screen.Bounds.Height,

              (int)Win32.TernaryRasterOperations.SRCCOPY);



            //  System.Diagnostics.Trace.WriteLine(screen.Bounds);



            if (!success)

            {

                System.ComponentModel.Win32Exception win32Exception =

                    new System.ComponentModel.Win32Exception();

                System.Diagnostics.Trace.WriteLine(win32Exception);

            }



            // Cleanup source HDC...

            Win32.DeleteDC(hdcSource);

        }



        // Cleanup destination HDC and Graphics...

        g.ReleaseHdc(hdcDestination);

        g.Dispose();



        // Return composite bitmap which will become our Form's PictureBox's image...

        return finalBitmap;



        ///Looking at the code, the first thing you'll see is that I'm using a mixture of GDI and GDI+. 

        ///This is due largely to the fact that there is a bug present in GDI+ and the BtBlt API.           

        ///This issue only manifests itself on systems with multiple monitors, and if I remember correctly,

        ///the system had to have a NVida display adapter on the non-primary monitor, and of course, our old friend Windows 98 running as the OS.

        ///What happens is the primary monitor captures fine, the secondary (or any non-primary) monitor stands a chance of returning garbage for an image. 

        ///It looks like cable channel with no signal.  



        ///Instead of relying on purely managed code, do copy the images, 

        ///or backing up to the BtBlt API, we instead fall back to it's somewhat slower cousin, StretchBlt.       



        ///first up we just grab all of the monitors using the Screen class' AllScreens property. 

        ///This does two things for us. First it allows us to figure out how big the entire desktop is, 

        ///and create an image just big enough to hold all of the screens inside. 

        ///And secondly, it allows us to figure out just where each monitor is positioned in relation to the other.

        ///Remember, with multiple monitor support you can "arrange" your monitors in different ways,

        ///and with different resolutions, so don't think in terms of a pure rectangle when you think of

        ///how your monitors are positioned.



        ///Once we have those screens, it's a trivial matter to calculate the size of the entire bitmap

        ///by using the Rectangle.Union method to build up the size of the overall image. 

        ///After we've figured out the size of the final image, we'll grab a Graphics object from the image.

        ///The GDI+ Graphics object is just the .NET wrapper around a device context.

        ///Using that graphics context, we can draw on the bitmap with the graphics object.



        ///Next, we'll enumerate through each monitor, and draw what that monitor has on it's device context,

        ///upon the image we just created that will hold the final screen shot. 

        ///Well draw it using it's coordinates so that in case the monitors have different resolutions or positioning

        ///we'll be able to see them as the Display Control Panel applet sees them.

        ///Go check it out if you have multiple monitors, and you didn't know you could move them.

        ///Chances are there if you have multiple monitors, you know this already, but if not so harm no foul.

        ///Open the settings tab and drag one of the monitors around and 

        ///you'll see you can reposition it in relation to the other monitors.



        ///For each monitor, we'll simply use the StretchBlt API to copy that monitor's device context contents,

        ///to the bitmap that will serve as the screen capture of the desktop. 

        ///Notice that I'm creating a device context each time, this gives us access to that monitor's device context so 

        ///that we can copy from it. Keep in mind that if we create it, we must destroy it, 

        ///so we delete the device context when we are finished with it. If you don't, you'll have a memory leak,

        ///so keep a watchful eye on your dc's and make sure to release or destroy them.

        ///A simple rule is, if you "acquire" it, you're required to "release" it. 

        ///And if you "create" it, then you must "destroy" it. 

        ///I quote those because if you look at the GDI APIs, with that in mind you'll find the necessary APIs to do exactly what you want.



        ///Finally, after copying the contents of each device context to that bitmap we created, 

        ///we'll release the Graphics object we acquired from the bitmap, and dispose it.

        ///That's the proper way to clean up a graphics object, if you've acquired a device context from it.





    }



    public static Bitmap CaptureDeskTopRectangle(Rectangle CapRect, int CapRectWidth, int CapRectHeight)

    {



        //This function just calls the GetDesktop, and just crops it.

        Bitmap bmpImage = new Bitmap(GetDesktopWindowCaptureAsBitmap());

        Bitmap bmpCrop = new Bitmap(CapRectWidth, CapRectHeight, bmpImage.PixelFormat);

        Rectangle recCrop = new Rectangle(CapRect.X, CapRect.Y, CapRectWidth, CapRectHeight);

        Graphics gphCrop = Graphics.FromImage(bmpCrop);

        Rectangle recDest = new Rectangle(0, 0, CapRectWidth, CapRectHeight);

        gphCrop.DrawImage(bmpImage, recDest, recCrop.X, recCrop.Y, recCrop.Width, recCrop.Height, GraphicsUnit.Pixel);

        return bmpCrop;

    }







// 

// Credits: Mark (Code6) Belles C# version

//               Me :+)) for the porting code

//               Thanks to EVA for g->ReleaseHDC or you may have a black screen

//               and MSDN http://msdn2.microsoft.com/en-us/library/ms533843(VS.85).aspx

// Enjoy: Feel free to use it....

//

//#include "stdafx.h"

//#include <windows.h>

//#include <gdiplus.h>



//#pragma comment(lib, "gdiplus.lib")



//#define SAFE_DELETE(ptrToDelete) if (ptrToDelete != NULL) { delete ptrToDelete; ptrToDelete = NULL; }



//ULONG_PTR     gdiplusToken;

//int m_nScreenCount;

//RECT m_ScreensRect[8];

//TCHAR m_ScreensName[8][CCHDEVICENAME];



//BOOL CALLBACK MyInfoEnumProcs( HMONITOR hMonitor, HDC hdcMonitor,

//                                                                      LPRECT lprcMonitor, LPARAM dwData )

//{

//     MONITORINFOEX monitorInfo;

//     memcpy(&m_ScreensRect[m_nScreenCount], lprcMonitor, sizeof(RECT));



//     memset(&monitorInfo, 0x0, sizeof(MONITORINFOEX));

//     monitorInfo.cbSize = sizeof(MONITORINFOEX);

//     GetMonitorInfo(hMonitor, &monitorInfo);



//     strcpy_s((char *) &m_ScreensName[m_nScreenCount], CCHDEVICENAME, monitorInfo.szDevice);



//     m_nScreenCount++;

//     return TRUE;

//}



//int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)

//{

//   UINT   num = 0;               // number of image encoders

//   UINT   size = 0;            // size of the image encoder array

//                                       // in bytes



//   Gdiplus::ImageCodecInfo* pImageCodecInfo = NULL;



//   Gdiplus::GetImageEncodersSize(&num, &size);

//   if(size == 0)

//      return -1;



//   pImageCodecInfo = (Gdiplus::ImageCodecInfo*)(malloc(size));

//   if(pImageCodecInfo == NULL)

//      return -1;



//   GetImageEncoders(num, size, pImageCodecInfo);



//   for(UINT j = 0; j < num; ++j)

//   {

//      if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )

//      {

//         *pClsid = pImageCodecInfo[j].Clsid;

//         free(pImageCodecInfo);

//         return j;   // Success

//      }

//   }



//   free(pImageCodecInfo);

//   return -1;

//}



//int _tmain(int argc, _TCHAR* argv[])

//{

//     Gdiplus::GdiplusStartupInput gdiplusStartupInput;

//     gdiplusToken = NULL;



//     if (GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL) != Gdiplus::Ok)

//     {

//          gdiplusToken = NULL;

//     }



//     memset(&m_ScreensRect, 0x0, sizeof(m_ScreensRect));

//     memset(&m_ScreensName, 0x0, sizeof(m_ScreensName));

//     EnumDisplayMonitors(NULL, NULL, MyInfoEnumProcs, 0);



//     HDC hdcDestination = NULL;



//     RECT rcScreen;

//     memset(&rcScreen, 0x0, sizeof(rcScreen));



//     for(int screenCount=0; screenCount < m_nScreenCount; screenCount++) 

//     {

//          UnionRect(&rcScreen, &rcScreen, &m_ScreensRect[screenCount]);

//     }



//     // Create a composite bitmap of the size of all screens...

//     Gdiplus::Bitmap* finalBitmap = new Gdiplus::Bitmap(rcScreen.right, rcScreen.bottom);



//     // Get a graphics object for the composite bitmap and initialize it...

//     Gdiplus::Graphics * g = Gdiplus::Graphics::FromImage(finalBitmap);     



//     g->SetCompositingQuality(Gdiplus::CompositingQualityHighSpeed);



//     Gdiplus::SolidBrush solidBrush(Gdiplus::Color(0,0,0));

//     g->FillRectangle(&solidBrush, 0, 0, rcScreen.right, rcScreen.bottom);



//     // Get an HDC for the composite area...

//     hdcDestination = g->GetHDC();



//     // Now, loop through screens, BitBlting each to the composite HDC created above...

//     for(int screenCount=0; screenCount < m_nScreenCount; screenCount++) 

//     {

//          // Create DC for each source monitor...

//          HDC hdcSource = CreateDC(NULL, m_ScreensName[screenCount], NULL, NULL);



//          // Blt the source directly to the composite destination...

//          int xDest = m_ScreensRect[screenCount].left - rcScreen.left;

//          int yDest = m_ScreensRect[screenCount].top - rcScreen.top;



//          StretchBlt(hdcDestination, xDest, yDest, m_ScreensRect[screenCount].right, m_ScreensRect[screenCount].bottom, 

//                        hdcSource, 0, 0, m_ScreensRect[screenCount].right, m_ScreensRect[screenCount].bottom, SRCCOPY | CAPTUREBLT);

          

//          // Cleanup source HDC...

//          DeleteDC(hdcSource);                    

//     }



//     g->ReleaseHDC(hdcDestination);



//     CLSID clsidJPEG;

//     GetEncoderClsid(L"image/jpeg", &clsidJPEG);

//     finalBitmap->Save(L"c:\\screenshot.jpg", &clsidJPEG); 

//     GetEncoderClsid(L"image/gif", &clsidJPEG);

//     finalBitmap->Save(L"c:\\screenshot.gif", &clsidJPEG); 

//     GetEncoderClsid(L"image/bmp", &clsidJPEG);

//     finalBitmap->Save(L"c:\\screenshot.bmp", &clsidJPEG); 



//     // Cleanup destination HDC and Graphics...

//     DeleteDC(hdcDestination);

//     SAFE_DELETE(g);

//     SAFE_DELETE(finalBitmap);



//     return 0;

//}



    }

}