Taking a screenshot in DirectDraw

This is a discussion on Taking a screenshot in DirectDraw within the Game Programming forums, part of the General Programming Boards category; How do I take a screenshot in fullscreen directdraw. I hit alt+printscrn, and also only printscrn, but I only get ...

  1. #1
    I am he who is the man! Stan100's Avatar
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    Taking a screenshot in DirectDraw

    How do I take a screenshot in fullscreen directdraw.

    I hit alt+printscrn, and also only printscrn, but I only get the white window created in the beginning of the program.

    Do I need some technique or (ugh) software?
    Stan The Man. Beatles fan

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  2. #2
    Super Moderator VirtualAce's Avatar
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    Code one.

    Simply iterate through your primary surface and write the values to disk - which will be huge in 32-bit color. Another alternative is to use RLE or make a function that will create a BMP out of the data. Then most programs could load your screenshot.

  3. #3
    I am he who is the man! Stan100's Avatar
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    whats RLE?
    Stan The Man. Beatles fan

    When I was a child,
    I spoke as a child,
    I thought as a child,
    I reasoned as a child.
    When I became a man,
    I put childish ways behind me"
    (the holy bible, Paul, in his first letter to the Cor. 13:11)

  4. #4
    Used Registerer jdinger's Avatar
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    This code below uses DirectDraw (DX7) but it's easily enough altered to work with other API's. For instance, for my OpenGL wrapper I pass HDCs directly instead of passing a DX surface and having to grab the HDC from it.

    Inside of "Types.h" I have:
    typedef LPDIRECTDRAWSURFACE7 lpdds7;

    Code:
    #pragma once
    
    #include "Types.h"
    #include <string>
    using std::string;
    
    void SaveScreen(lpdds7 sfHDC);
    PBITMAPINFO MakeBI(lpdds7 sfHDC);
    Code:
    #include "ScreenCapture.h"
    
    HBITMAP NewBmp=NULL, OldBmp=NULL;
    HDC hdcCom=NULL;
    
    void SaveScreen(lpdds7 sfHDC)
    {
    	HANDLE hf;
    	BITMAPFILEHEADER hdr;
    	PBITMAPINFOHEADER pbih;
    	LPBYTE lpBits;
    	DWORD dwTotal;
    	DWORD cb;
    	BYTE *hp;
    	DWORD dwTmp;
    	PBITMAPINFO pbiTest=MakeBI(sfHDC);
    	pbih=(PBITMAPINFOHEADER) pbiTest;
    	lpBits=(LPBYTE)GlobalAlloc(GMEM_FIXED,pbih->biSizeImage);
    	GetDIBits(hdcCom,NewBmp,0,(WORD)pbih->biHeight,lpBits,pbiTest,DIB_RGB_COLORS);
    	//lpwin32_find_data
    	WIN32_FIND_DATA finddata;
    	string sBitmapName;
    	int iFileCheck=1;
    	hf=FindFirstFile("screen*.bmp",&finddata);
    	if(hf==INVALID_HANDLE_VALUE)
    	{
    		sBitmapName="screen0.bmp";
    	}
    	else
    	{
    		while(iFileCheck)
    		{
    			iFileCheck=FindNextFile(hf,&finddata);
    		}
    		string sLastBitmapFound=finddata.cFileName;
    		string sFileID="";
    		char cID[5];
    		int EndOfID, ID, i;
    		for(i=6;i<sLastBitmapFound.size();i++)
    		{
    			if(!isdigit(sLastBitmapFound[i]))
    			{
    				EndOfID=i;
    				break;
    			}
    		}
    		for(i=6;i<EndOfID;i++)
    		{
    			sFileID+=sLastBitmapFound[i];
    		}
    		ID=atoi(sFileID.c_str());
    		ID++;
    		itoa(ID,cID,10);
    		sBitmapName="screen";
    		sBitmapName+=cID;
    		sBitmapName+=".bmp";
    		DebugLog(sBitmapName.c_str(),ID,1);
    	}
    	hf=CreateFile(sBitmapName.c_str(),GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
    	hdr.bfType=0x4d42;
    	hdr.bfSize=(DWORD)(sizeof(BITMAPFILEHEADER)+pbih->biSize+pbih->biClrUsed*sizeof(RGBQUAD)+pbih->biSizeImage);
    	hdr.bfReserved1=0;
    	hdr.bfReserved2=0;
    	hdr.bfOffBits=(DWORD)sizeof(BITMAPFILEHEADER)+pbih->biSize+pbih->biClrUsed*sizeof(RGBQUAD);
    	WriteFile(hf,(LPVOID)&hdr,sizeof(BITMAPFILEHEADER),(LPDWORD)&dwTmp,NULL);
    	WriteFile(hf,(LPVOID)pbih,sizeof(BITMAPINFOHEADER)+pbih->biClrUsed*sizeof(RGBQUAD),(LPDWORD)&dwTmp,NULL);
    	dwTotal=cb=pbih->biSizeImage;
    	hp=lpBits;
    	WriteFile(hf,(LPSTR)hp,(int)cb,(LPDWORD)&dwTmp,NULL);
    	CloseHandle(hf);
    	DebugLog("Scree capture recorded.",0,1);
    	GlobalFree((HGLOBAL)lpBits);
    	SelectObject(hdcCom,OldBmp);
    	DeleteObject(NewBmp);
    	NewBmp=NULL;
    	DeleteDC(hdcCom);
    	hdcCom=NULL;
    }
    
    PBITMAPINFO MakeBI(lpdds7 sfHDC)
    {
    	BITMAP bmp;
    	PBITMAPINFO pbmi;
    	WORD cClrBits;
    	HDC hdc;
    	sfHDC->GetDC(&hdc);
    	NewBmp=CreateCompatibleBitmap(hdc,800,600);
    	hdcCom=CreateCompatibleDC(hdc);
    	OldBmp=(HBITMAP)SelectObject(hdcCom,NewBmp);
    	BitBlt(hdcCom,0,0,800,600,hdc,0,0,SRCCOPY);
    	sfHDC->ReleaseDC(hdc);
    	hdc=NULL;
    	GetObject(NewBmp,sizeof(BITMAP),(LPSTR)&bmp);
    	cClrBits=(WORD)(bmp.bmPlanes*bmp.bmBitsPixel);
    	if(cClrBits==1)
    		cClrBits=1;
    	else if(cClrBits<=4)
    		cClrBits=4;
    	else if(cClrBits<=8)
    		cClrBits=8;
    	else if(cClrBits<=16)
    		cClrBits=16;
    	else if(cClrBits<=24)
    		cClrBits=24;
    	else cClrBits=32;
    	if(cClrBits!=24)
    		pbmi=(PBITMAPINFO)LocalAlloc(LPTR,sizeof(BITMAPINFOHEADER)+sizeof(RGBQUAD)*(1<<cClrBits));
    	else
    		pbmi=(PBITMAPINFO)LocalAlloc(LPTR,sizeof(BITMAPINFOHEADER));
    	pbmi->bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
    	pbmi->bmiHeader.biWidth=bmp.bmWidth;
    	pbmi->bmiHeader.biHeight=bmp.bmHeight;
    	pbmi->bmiHeader.biPlanes=bmp.bmPlanes;
    	pbmi->bmiHeader.biBitCount=bmp.bmBitsPixel;
    	if(cClrBits<24)
    		pbmi->bmiHeader.biClrUsed=(1<<cClrBits);
    	pbmi->bmiHeader.biClrImportant=BI_RGB;
    	pbmi->bmiHeader.biSizeImage=((pbmi->bmiHeader.biWidth*cClrBits+31)&~31)*pbmi->bmiHeader.biHeight;
    	pbmi->bmiHeader.biClrImportant=0;
    	return(pbmi);
    }

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