BMPTOPNG

BMP 이미지를 PNG로 변환시키는 루틴

VS 2008을 사용하여야 작동합니다. ㅡㅡ; 그지같은 VS6.0

#include
#include
#include
#include 
#include 

#define CAPTUREBLT          (DWORD)0x40000000 /* Include layered windows */
#define false 0


void CaptureScreen();
void SaveBitmap(char *szFilename,HBITMAP hBitmap);

int main(void)
{
 CaptureScreen();
 LPCTSTR filename=_T("c:\\test.bmp");
 LPCTSTR changefilename=_T("c:\\test01.png");

 CImage myImage;
 myImage.Load(filename);
 myImage.Save(changefilename);

 return 0;
}

void CaptureScreen()
{
 int nScreenWidth = GetSystemMetrics(SM_CXSCREEN);
 int nScreenHeight = GetSystemMetrics(SM_CYSCREEN);
 HWND hDesktopWnd = GetDesktopWindow();
 HDC hDesktopDC = GetDC(hDesktopWnd);
 HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
 HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC, 
  nScreenWidth, nScreenHeight);
 SelectObject(hCaptureDC,hCaptureBitmap); 
 BitBlt(hCaptureDC,
  0,
  0,
  nScreenWidth,
  nScreenHeight,
  hDesktopDC,0,0,SRCCOPY|CAPTUREBLT); 
 SaveBitmap("c:\\test.png" ,hCaptureBitmap); //Place holder - Put your code
 //here to save the captured image to disk
 ReleaseDC(hDesktopWnd,hDesktopDC);
 DeleteDC(hCaptureDC);
 DeleteObject(hCaptureBitmap);
}

void SaveBitmap(char *szFilename,HBITMAP hBitmap)
{
 HDC     hdc=NULL;
 FILE*    fp=NULL;
 LPVOID    pBuf=NULL;
 BITMAPINFO   bmpInfo;
 BITMAPFILEHEADER bmpFileHeader;

 do{

  hdc=GetDC(NULL);
  ZeroMemory(&bmpInfo,sizeof(BITMAPINFO));
  bmpInfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
  GetDIBits(hdc,hBitmap,0,0,NULL,&bmpInfo,DIB_RGB_COLORS);

  if(bmpInfo.bmiHeader.biSizeImage<=0)
   bmpInfo.bmiHeader.biSizeImage=bmpInfo.bmiHeader.biWidth*abs(bmpInfo.bmiHeader.biHeight)*(bmpInfo.bmiHeader.biBitCount+7)/8;

  if((pBuf=malloc(bmpInfo.bmiHeader.biSizeImage))==NULL)
  {
   //   MessageBox(NULL,"Unable to Allocate Bitmap Memory","Error",MB_OK|MB_ICONERROR);
   break;
  }

  bmpInfo.bmiHeader.biCompression=BI_RGB;
  GetDIBits(hdc,hBitmap,0,bmpInfo.bmiHeader.biHeight,pBuf,&bmpInfo,DIB_RGB_COLORS); 

  if((fp=fopen(szFilename,"wb"))==NULL)
  {
   //   MessageBox(NULL,"Unable to Create Bitmap File","Error",MB_OK|MB_ICONERROR);
   break;
  }

  bmpFileHeader.bfReserved1=0;
  bmpFileHeader.bfReserved2=0;
  bmpFileHeader.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+bmpInfo.bmiHeader.biSizeImage;
  bmpFileHeader.bfType='MB';
  bmpFileHeader.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);

  fwrite(&bmpFileHeader,sizeof(BITMAPFILEHEADER),1,fp);
  fwrite(&bmpInfo.bmiHeader,sizeof(BITMAPINFOHEADER),1,fp);
  fwrite(pBuf,bmpInfo.bmiHeader.biSizeImage,1,fp);

 }while(false);

 if(hdc)
  ReleaseDC(NULL,hdc);

 if(pBuf)
  free(pBuf);

 if(fp)
  fclose(fp);
}