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Please help , I would desperately appreciate it if you could send me
the source code for screencapture.dll , I am currently creating an application that requires the image from the desktop to be stored in a file.
The tears shed in vain
and the hatred and pain
will be nothing but dust
at the end of the day
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I really don't know why this article is in the CODE project, if there is no CODE...
Use this, it's not perfect, but it's here!
/////////////////////////////////////////////////////////////////////////
//////////////////// THIS CODE WASN'T CREATED BY ME, BUT I DON'T REMEMBER
//////////////////// THE AUTHOR'S NAME. SORRY!
/////////////////////////////////////////////////////////////////////////
public Image CaptureScreen()
{
return CaptureWindow( User32.GetDesktopWindow() );
}
///
/// Creates an Image object containing a screen shot of a specific window
///
/// The handle to the window. (In windows forms, this is obtained by the Handle property)
///
public Image CaptureWindow(IntPtr handle)
{
// get te hDC of the target window
IntPtr hdcSrc = User32.GetWindowDC(handle);
// get the size
User32.RECT windowRect = new User32.RECT();
User32.GetWindowRect(handle,ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy to
IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);
// select the bitmap object
IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);
// bitblt over
GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);
// restore selection
GDI32.SelectObject(hdcDest,hOld);
// clean up
GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle,hdcSrc);
// get a .NET image object for it
Image img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
GDI32.DeleteObject(hBitmap);
return img;
}
///
/// Captures a screen shot of a specific window, and saves it to a file
///
///
///
///
public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
{
Image img = CaptureWindow(handle);
img.Save(filename,format);
}
///
/// Captures a screen shot of the entire desktop, and saves it to a file
///
///
///
public void CaptureScreenToFile(string filename, ImageFormat format)
{
Image img = CaptureScreen();
img.Save(filename,format);
}
///
/// Helper class containing Gdi32 API functions
///
private class GDI32
{
public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,
int nWidth,int nHeight,IntPtr hObjectSource,
int nXSrc,int nYSrc,int dwRop);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,
int nHeight);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);
}
///
/// Helper class containing User32 API functions
///
private class User32
{
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
[DllImport("user32.dll")]
public static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);
}
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Any one have SnaperHelper.dll's source code please send it to me.
thanks.
my e-mail : ayyagari_shankar@yahoo.com
shankar
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please send me the souce code of the SnaperHelper.dll.
my e-mail : ayyagari_shankar@sify.com
shankar
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hy,
Everybody,
Can it posible that capturing image of any application window
without displying it.I mean that application is running in backgroud that mean it`s window is hide,Now can i capture that
window which is hide? if yes then how?
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Hello Everyone,
I was wondering what would be the best way to send a form to the printer.
I have a form the user fills in. Once they are done it needs to be printed. Is there a way to do a screen capture to a bitmap? Maybe I can then print the bitmap.
Thanks in Advance for any help.
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Hi
First of all I was quite impressed of the interface of your source!
Nice work! 
I just wanted to know one thing though..
Is it possible to fix the width while capturing? (something like region capturing, just that the mouse's width will be fixed after once clicking to make the square for capturing area)
I tried to add couple of functions but the DLL somehow seemed to do everything
so I couldn't get my hands into it
Could you pull me some hands out for me to do this job?
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Hi Dany,
I have seen some anomalies in your code, if we run the multiple instances of this application then printscreen message dose not goto your application. Instead it goes to system directly.
I figure out that you are registering your own windows message "UWM_PRINTSCREEN", thats why it fails for other instances (while registering message).
Is there any work around to send printscreen message to application only, instead of system while the multiple instances of application are active.
Thank you,
Regards,
Vishal More
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hum - they want the source
screen capture can be done using winAPI like this:
call GetDC(0) to get the screen dc where all is painted;
determine the rectangle size - by call to GetClientRect, with window handle from GetDesktopWindow();
CreateBitmap with the determined size; call BitBlt to copy to our bitmap from screen;
finally use ReleaseDc to free allocated DC;
sorry that i have no time to write it in C.
DLL will be needed if you want to hook keyboard clicks.
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Hey, thanks! Here's what I wrote in Borland Delphi 7 based on your tips:
procedure TForm1.Button1Click(Sender: TObject);
var
hWndIE, AppDC: THandle;
Rect: TRect;
begin
hWndIE := FindWindow('IEFrame', nil); // http://delphi.about.com/library/weekly/aa060303b.htm
if hWndIE > 0 then
begin
try
Application.Minimize;
AppDC := GetWindowDC(hWndIE);
Windows.GetClientRect(hWndIE, Rect);
with Image.Picture.Bitmap do
begin
PixelFormat := pf32bit;
Height := Rect.Bottom - Rect.Top + 1;
Width := Rect.Right - Rect.Left + 1;
{thanks to http://www.swissdelphicenter.ch/torry/showcode.php?id=140}
BitBlt(Canvas.Handle, 0, 0, Width, Height, AppDC, 0, 0, SRCCOPY);
Modified := True;
end;
finally
ReleaseDC(0, hWndIE);
end;
Application.Restore;
end;
end;
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HI
i used the gdi way to capture the screen. bu there seems to be some problems.
1) cursor is not captured.. if so how can i draw the cursor on the capture image...
2) i have form in C# whose Opacity=0.25 percent. and there are some writings on them... i could not cathc them also...
is there anywya to capture this thing also... i suppose they r like overlays..
ve
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Well , thanks , but I'm coding in pure C using the
win32 api.
I have something that looks like this :
HBITMAP hbm;
HDC screendc;
HDC imagedc;
int w;
int h;
int init(void)
{
screendc = GetDC(NULL);
imagedc = CreateCompatibleDC(screendc);
w = GetSystemMetrics(SM_CXSCREEN);
h = GetSystemMetrics(SM_CYSCREEN);
hbm = CreateCompatibleBitmap(imagedc,w,h);
ReleaseDC(NULL,screendc);
}
void CaptureSave(LPSTR szFname)
{
SelectObject(imagedc,hbm);
screendc = GetDC(NULL);
BitBlt(imagedc,0,0,w,h,screendc,0,0,SRCCOPY);
ReleaseDC(NULL,screendc);
ConvertSaveDIB(szFname,hbm);
}
void ConvertSaveDIB(LPSTR fn,HBITMAP bm)
{
//???
//I have no idea how to convert from DDB to DIB....
//I know how to save the file , but in C it's an altogether
//different problem to get it into the right format...
//I think I saw some code once to do this , but I forgot where...
//Sorry guys , I wish I could be of more help... but I'm stuck on this
//one as well....if anyone can help , it would be appreciated.
}
The tears shed in vain
and the hatred and pain
will be nothing but dust
at the end of the day
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Hi , I have a good way for you to get a hold of the screen.... :
this method has worked for me without fail , for more than a year now ,
and Im still waiting to find a pc that won't be able to perform this function
To use it simply add the forward declaration (prototype) at the top of your file :
int SnapShot(char* fname);
And then , when you want to use it , simply call it with a file name :
{
//.......some code
SnapShot("img0.bmp");
//.......some code
}
int SnapShot(char* fname)
{
HBITMAP hdib;
BITMAPINFO bi;
BITMAPFILEHEADER bfh;
void *bits; // the dib information...
bits=NULL;
int WIDTH,HEIGHT,BPP;
WIDTH = GetSystemMetrics(SM_CXSCREEN);
HEIGHT=GetSystemMetrics(SM_CYSCREEN);
BPP = 24;
//you can use GetSystemMetrics(SM_BITSPERPEL);
// for this call , but i like to use one
//uniform standard for all my dibs :)
bi.bmiHeader.biSize = 40;
bi.bmiHeader.biWidth = WIDTH;
bi.bmiHeader.biHeight = HEIGHT;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = BPP;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (BPP/8)*(WIDTH)*(HEIGHT);
bi.bmiHeader.biXPelsPerMeter =0;
bi.bmiHeader.biYPelsPerMeter =0;
bi.bmiHeader.biClrUsed =0;
bi.bmiHeader.biClrImportant =0;
bfh.bfType = 0x4D42;
bfh.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
bfh.bfSize = bi.bmiHeader.biSizeImage+bfh.bfOffBits;
bfh.bfReserved1 = 0;
bfh.bfReserved2 = 0;
HDC hdc = GetDCEx (hWnd,NULL, DCX_CACHE|DCX_LOCKWINDOWUPDATE) ;
HDC fdc = CreateCompatibleDC(hdc);
hdib = CreateDIBSection(fdc,&bi,DIB_RGB_COLORS,&bits,NULL,0);
SelectObject(fdc,hdib);
BitBlt(fdc,0,0,WIDTH,HEIGHT,hImgDC,0,0,SRCCOPY);
ReleaseDC(hWnd,hdc);
//this creates a directory called "snapshots"
//and tells the user what's happening
char firstpath[255];
GetCurrentDirectory(255,firstpath);
if(SetCurrentDirectory("SnapShots") == 0)
CreateDirectory("SnapShots",NULL);
SetCurrentDirectory(firstpath);
char *tempbuffer=malloc(sizeof(char)*255);
sprintf(tempbuffer,"%s\\SnapShots\\%s",firstpath,fname);
MessageBox(NULL,tempbuffer,"Creating...",MB_OK);
BOOL bSuccess = FALSE ;
DWORD dwBytesWritten ;
HANDLE hFile ;
hFile = CreateFile (tempbuffer, GENERIC_WRITE,FILE_SHARE_WRITE, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL) ;
if (hFile == INVALID_HANDLE_VALUE)
return FALSE ;
bSuccess = WriteFile (hFile,&bfh,sizeof(bfh), &dwBytesWritten, NULL) ;
bSuccess = WriteFile (hFile,&bi.bmiHeader,sizeof(bi.bmiHeader), &dwBytesWritten, NULL) ;
bSuccess = WriteFile (hFile,bits,bi.bmiHeader.biSizeImage, &dwBytesWritten, NULL) ;
CloseHandle (hFile) ;
DeleteDC(fdc);
DeleteObject(hdib);
free(tempbuffer);
return TRUE;
}
The tears shed in vain
and the hatred and pain
will be nothing but dust
at the end of the day
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Hey,
i only want to say that this works fine!
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Hi,
How can we implement autoscroll feature on it?
I hate to use hypersnap..
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Did Your project based on/inspired by this MSDN sample?
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Very nice control, love the interface.
i was wondering if there's a way to caputre the coordinates of the selected region using your DLL?
I need to find out the x1, y1, x2, y2 coordinates of user selected area on the screen.
Also do you have an API to output the captured image to certain format?
Thanks a lot!!
Dave
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Actually you cannot get the coordinates of selected region and no other image formats included.
For the coordinates, I will add CRect function to get the x1, y1, x2, y2 coordinates of user selected area on the screen ex: HBITMAP GetRegionImage(LPRECT lprc);
For captured image format, nothing new! Your app need to convert HBITMAP Handle to other image format.
===== Last week, one people offer me 1500$ US to have the source code and at this moment, I dont know if I will accept this offer. =====
->L'enfer est pavé de bonnes intentions! :-S
->The road to hell is paved with good intentions! :-S
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Cool, thanks.
the CRect function is not currently available right?
any estimates on when?
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This is a joke. If you dont want to share the .dll source you should post your program under some other topic such as "PictureBox with Scrollbars". This site is for sharing source code. What exactly was you looking in here? Admiration? Bleh...
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Have you stolen the library from some other proejct. Can you post the link or refrance 
In my openion the name of the project should be "Using a dll in VC and VB without my help"
Hardwork is key to success...
Bilal Ahmed
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This library is my own A-Z work. Its free and have only 4 functions to call. Look in the demo to see how call theses functions. Very easy!!!
->L'enfer est pavé de bonnes intentions! :-S
->The road to hell is paved with good intentions! :-S
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This tool is very slick & powerfull. I like it!
I did find one bug. I have a dual monitor setup here, and it only allows me to capture stuff from the primary monitor. Thanks.
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