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Screen Capture Program

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Screen Capture Program

 
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  #1
May 1st, 2009
I am creating this simple program that will capture screen shots. I want to make it so the name of the image that is saved is what the user enters into a text field before the picture is taken. and if at all possible is there a way to make this window pop up above the game screen when a key combination is pressed?

thanks! this is the code i have so far btw.

C++ Syntax (Toggle Plain Text) 
  1. #include<iostream>
  2. #include<windows.h>
  3. using namespace std;
  4.  
  5. inline int GetFilePointer(HANDLE FileHandle){
  6. 	return SetFilePointer(FileHandle, 0, 0, FILE_CURRENT);
  7. }
  8.  
  9. bool SaveBMPFile(char *filename, HBITMAP bitmap, HDC bitmapDC, int width, int height){
  10. 	bool Success=0;
  11. 	HDC SurfDC=NULL;
  12. 	HBITMAP OffscrBmp=NULL;
  13. 	HDC OffscrDC=NULL;
  14. 	LPBITMAPINFO lpbi=NULL;
  15. 	LPVOID lpvBits=NULL;
  16. 	HANDLE BmpFile=INVALID_HANDLE_VALUE;
  17. 	BITMAPFILEHEADER bmfh;
  18. 	if ((OffscrBmp = CreateCompatibleBitmap(bitmapDC, width, height)) == NULL)
  19. 		return 0;
  20. 	if ((OffscrDC = CreateCompatibleDC(bitmapDC)) == NULL)
  21. 		return 0;
  22. 	HBITMAP OldBmp = (HBITMAP)SelectObject(OffscrDC, OffscrBmp);
  23. 	BitBlt(OffscrDC, 0, 0, width, height, bitmapDC, 0, 0, SRCCOPY);
  24. 	if ((lpbi = (LPBITMAPINFO)(new char[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)])) == NULL)
  25. 		return 0;
  26. 	ZeroMemory(&lpbi->bmiHeader, sizeof(BITMAPINFOHEADER));
  27. 	lpbi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
  28. 	SelectObject(OffscrDC, OldBmp);
  29. 	if (!GetDIBits(OffscrDC, OffscrBmp, 0, height, NULL, lpbi, DIB_RGB_COLORS))
  30. 		return 0;
  31. 	if ((lpvBits = new char[lpbi->bmiHeader.biSizeImage]) == NULL)
  32. 		return 0;
  33. 	if (!GetDIBits(OffscrDC, OffscrBmp, 0, height, lpvBits, lpbi, DIB_RGB_COLORS))
  34. 		return 0;
  35. 	if ((BmpFile = CreateFile(filename,
  36. 						GENERIC_WRITE,
  37. 						0, NULL,
  38. 						CREATE_ALWAYS,
  39. 						FILE_ATTRIBUTE_NORMAL,
  40. 						NULL)) == INVALID_HANDLE_VALUE)
  41. 		return 0;
  42. 	DWORD Written;
  43. 	bmfh.bfType = 19778;
  44. 	bmfh.bfReserved1 = bmfh.bfReserved2 = 0;
  45. 	if (!WriteFile(BmpFile, &bmfh, sizeof(bmfh), &Written, NULL))
  46. 		return 0;
  47. 	if (Written < sizeof(bmfh))
  48. 		return 0;
  49. 	if (!WriteFile(BmpFile, &lpbi->bmiHeader, sizeof(BITMAPINFOHEADER), &Written, NULL))
  50. 		return 0;
  51. 	if (Written < sizeof(BITMAPINFOHEADER))
  52. 		return 0;
  53. 	int PalEntries;
  54. 	if (lpbi->bmiHeader.biCompression == BI_BITFIELDS)
  55. 		PalEntries = 3;
  56. 	else PalEntries = (lpbi->bmiHeader.biBitCount <= 8) ?
  57. 					  (int)(1 << lpbi->bmiHeader.biBitCount) : 0;
  58. 	if(lpbi->bmiHeader.biClrUsed)
  59. 	PalEntries = lpbi->bmiHeader.biClrUsed;
  60. 	if(PalEntries){
  61. 	if (!WriteFile(BmpFile, &lpbi->bmiColors, PalEntries * sizeof(RGBQUAD), &Written, NULL))
  62. 		return 0;
  63. 		if (Written < PalEntries * sizeof(RGBQUAD))
  64. 			return 0;
  65. 	}
  66. 	bmfh.bfOffBits = GetFilePointer(BmpFile);
  67. 	if (!WriteFile(BmpFile, lpvBits, lpbi->bmiHeader.biSizeImage, &Written, NULL))
  68. 		return 0;
  69. 	if (Written < lpbi->bmiHeader.biSizeImage)
  70. 		return 0;
  71. 	bmfh.bfSize = GetFilePointer(BmpFile);
  72. 	SetFilePointer(BmpFile, 0, 0, FILE_BEGIN);
  73. 	if (!WriteFile(BmpFile, &bmfh, sizeof(bmfh), &Written, NULL))
  74. 		return 0;
  75. 	if (Written < sizeof(bmfh))
  76. 		return 0;
  77. 	return 1;
  78. }
  79. bool ScreenCapture(int x, int y, int width, int height, char *filename){
  80. 	HDC hDc = CreateCompatibleDC(0);
  81. 	HBITMAP hBmp = CreateCompatibleBitmap(GetDC(0), width, height);
  82. 	SelectObject(hDc, hBmp);
  83. 	BitBlt(hDc, 0, 0, width, height, GetDC(0), x, y, SRCCOPY);
  84. 	bool ret = SaveBMPFile(filename, hBmp, hDc, width, height);
  85. 	DeleteObject(hBmp);
  86. 	return ret;
  87. }
  88.  
  89. int main() {
  90. 	int x1 = 0;
  91. 	int y1 = 0;
  92. 	int x2 = GetSystemMetrics(SM_CXSCREEN);
  93. 	int y2 = GetSystemMetrics(SM_CYSCREEN);
  94. 	ScreenCapture(x1, y1, x2 - x1, y2 - y1, "rename_me_before_upload.bmp");
  95. 	cin.ignore();
  96. 	return 0;
  97. }
Last edited by kashmir323; May 1st, 2009 at 5:02 pm.
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Re: Screen Capture Program

 
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  #2
May 1st, 2009
If all you want to do is let allow the user to input the bitmap name, use std::cin to get the name, and strcat ".bmp" on the end. Change your main code like this:
C++ Syntax (Toggle Plain Text) 
  1. int main() {
  2.   int x1 = 0;
  3.   int y1 = 0;
  4.   int x2 = GetSystemMetrics(SM_CXSCREEN);
  5.   int y2 = GetSystemMetrics(SM_CYSCREEN);
  6.  
  7.   char bmp_name[100];
  8.   cin.getline( bmp_name, 96 );
  9.   strcat( bmp_name, ".bmp" );
  10.  
  11.  
  12.   ScreenCapture(x1, y1, x2 - x1, y2 - y1, bmp_name);
  13.  
  14.   cin.ignore();
  15.   return 0;
  16. }

>if at all possible is there a way to make this window pop up above the game screen when a key combination is pressed?
Not quite sure what you mean by this.
Last edited by William Hemsworth; May 1st, 2009 at 6:25 pm.
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Re: Screen Capture Program

 
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  #3
May 1st, 2009
Since this program is a anti-cheat parameter for the league, the picture wont be needed till once the player is in game. so once in game i would like the players to push lets say Shift+Alt+S to bring up the console app over top the game. Then once the picture is taken and saved then push Shift+Alt+S to minimize the console behind the top screen again.
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Re: Screen Capture Program

 
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  #4
May 1st, 2009
Okay, that's tricky but possible. In this small example, I check to see if those keys are down. If they are down, it will toggle the windows visibility. I tried using windows hooks to give this example, but I couldn't set the hook without having a hInstance, so I tried this alternative method which works on console windows.
C++ Syntax (Toggle Plain Text) 
  1. #define _WIN32_WINNT 0x0500
  2. #include <windows.h>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. int main() {
  7.   bool visible = false;
  8.   ShowWindow( GetConsoleWindow(), SW_HIDE );
  9.  
  10.   for ( ; ; ) {
  11.  
  12.     if ( GetAsyncKeyState( VK_SHIFT ) &&
  13.          GetAsyncKeyState( VK_MENU ) &&
  14.          GetAsyncKeyState( VkKeyScanA('s') ) )
  15.     {
  16.       if ( visible )
  17.         ShowWindow( GetConsoleWindow(), SW_HIDE );
  18.       else
  19.         ShowWindow( GetConsoleWindow(), SW_SHOW );
  20.  
  21.       visible = !visible;
  22.       Sleep( 500 );
  23.     }
  24.  
  25.     Sleep( 100 );
  26.   }
  27.  
  28.   cin.ignore();
  29. }
Whether or not ShowWindow will be enough to bring the console window in front of the game, I don't know, but that would be the next stage if the above doesn't work.

Hope this helps.

Code tags don't seem to work correctly, and can't get the C++ syntax, not sure why.
Last edited by William Hemsworth; May 1st, 2009 at 8:21 pm.
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Re: Screen Capture Program

 
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  #5
May 1st, 2009
Alright. So i havent compiled any programs for a while and im compiling this using the Microsoft Visual C++ Toolkit 2003. When i click build it gives me an error saying:
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"LRSscreenshooter - Release" uses an invalid compiler. Skipping...
Nothing to be done.
Any idea what is wrong? And im building this in CodeBlocks 8.02.
Last edited by kashmir323; May 1st, 2009 at 9:47 pm.
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32 Days Ago
Hello,

I'm trying to use the code in the first post to capture a smaller area than the whole screen. I have a point that is at the center of the area I need to capture. In my main() function I call ScreenCapture(xPos - 25, yPos - 25, 50, 50, "image.bmp"), where xPos is the x-position of the center and yPos is the y-position of the center point.

Everything is running OK, but the saved image is black. It has the right size, but it's black. What am I doing wrong?

Thanx!
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32 Days Ago
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Originally Posted by thefly View Post
Hello,

I'm trying to use the code in the first post to capture a smaller area than the whole screen. I have a point that is at the center of the area I need to capture. In my main() function I call ScreenCapture(xPos - 25, yPos - 25, 50, 50, "image.bmp"), where xPos is the x-position of the center and yPos is the y-position of the center point.

Everything is running OK, but the saved image is black. It has the right size, but it's black. What am I doing wrong?

Thanx!
What OS are you using ?
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Originally Posted by ithelp View Post
What OS are you using ?
Windows Vista 32bit. Capturing the whole screen works well. I get normal screen shot.
Last edited by thefly; 32 Days Ago at 5:32 am.
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