Environment: [VC6 SP4, NT4 SP3, W2k, Win 9x]
I have found that the Microsft GDI+ can do many cool things for you. Previously you had to find code or write your own code to do the same things. One of these things is the ability to load or save the following types of images:
- BMP
- DIB
- RLE
- GIF
- JPEG
- EMF
- TIFF
- PNG
These can be loaded with just a few lines of code like this:
#include <Gdiplus.h> using namespace Gdiplus; #pragma comment(lib, "gdiplus.lib") Image Im(L"c:\fig.jpg", FALSE); CLSID GifCodec; GetCodecClsid(L"image/gif", &GifCodec); Im.Save(L"c:\fig.gif", &GifCodec, NULL);
Here is the code to GetCodecClsid
int GetCodecClsid(const WCHAR* format, CLSID* pClsid) { UINT num = 0; // number of image encoders UINT size = 0; // size of the image encoder array in bytes ImageCodecInfo* pImageCodecInfo = NULL; GetImageEncodersSize(&num, &size); if(size == 0) return -1; // Failure pImageCodecInfo = (ImageCodecInfo*)(malloc(size)); if(pImageCodecInfo == NULL) return -1; // Failure GetImageEncoders(num, size, pImageCodecInfo); for(UINT j = 0; j < num; ++j) { if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 ) { *pClsid = pImageCodecInfo[j].Clsid; return j; // Success } } // for return -1; // Failure } // GetCodecClsid
All help about GDI+ can be found at: http://msdn.microsoft.com/library/default.asp
Downloads
Here is the library, headers and the dll to build the samples gdiplus.zip (900K):