Does D3DXLoadSurfaceFromFileInMemory function really support png   

Hi , guys,

In my project, I will use file buffer to create texture instead of local 
file. The buffer is downloaded through http. I want to avoid save the buffer 
to local file then create texture .So I try to use 
D3DXLoadSurfaceFromFileInMemory() function to create surface. It works fine 
if the buffer is bmp file buffer. All other file type will return 
failed,D3DXERR_INVALIDDATA.

In MSDN ,This function supports the following file formats: .bmp, .dds, 
..dib, .jpg, .png, and .tga.

Did I do anything wrong?  Thank you for any suggestion and help!

Bravew

Here is the code:
  //testing code , simulating get image buffer from internet
  //char fileName[] = "c:\\image\\a.bmp";
  char fileName[] = "c:\\image\\transparent.png"; //error 
  struct __stat64 buf;
  int fd, result;
  fd = _open( fileName, _O_RDONLY );
  result = _fstat64( fd, &buf );
  BYTE *  buffer  = new BYTE [  buf.st_size ];
   FILE *fp = 0;
   fp = fopen(fileName,"r");
   int bytes;
  bytes = fread(buffer, 1,  buf.st_size, fp);
 
  mpNormTex->GetSurfaceLevel(levelMipMap, &surface);
  // get D3DXIMAGE_INFO first
  D3DXIMAGE_INFO imageInfo;
  hr = D3DXGetImageInfoFromFileInMemory(buffer,size,&imageInfo);
   // Here is the problem, it will return D3DXERR_INVALIDDATA for not bmp file
  hr = D3DXLoadSurfaceFromFileInMemory (surface, NULL, NULL,  buffer,   
buf.st_size,  NULL, D3DX_FILTER_NONE, 0,  &imageInfo) ;

_close( fd );
fclose(fp);

date: Sun, 26 Mar 2006 15:07:27 -0800   author:   Bravew