c++ win32 environment, taglib error - c++

Question

I want to extract albumart from mp3 files
so i use taglib library
extracting title and artist succed.
but when i try to extract album art, it occurs error.
void MusicContainer::getAlbumArt(const char* path) {
static const char *IdPicture = "APIC";
TagLib::MPEG::File mpegFile(path);
TagLib::ID3v2::Tag *id3v2tag = mpegFile.ID3v2Tag();
TagLib::ID3v2::FrameList Frame;
TagLib::ID3v2::AttachedPictureFrame *PicFrame;
void *RetImage = NULL, *SrcImage;
unsigned long Size;
FILE *jpegFile;
errno_t err = fopen_s(&jpegFile, "d:\\FromId3.jpg", "wb");
if (id3v2tag)
{
// picture frame
Frame = id3v2tag->frameListMap()[IdPicture];//error occurs on this line.
if (!Frame.isEmpty())
{
for (TagLib::ID3v2::FrameList::ConstIterator it = Frame.begin(); it != Frame.end(); ++it)
{
PicFrame = (TagLib::ID3v2::AttachedPictureFrame *)(*it);
//  if ( PicFrame->type() ==
//TagLib::ID3v2::AttachedPictureFrame::FrontCover)
{
// extract image (in it’s compressed form)
Size = PicFrame->picture().size();
SrcImage = malloc(Size);
if (SrcImage)
{
memcpy(SrcImage, PicFrame->picture().data(), Size);
fwrite(SrcImage, Size, 1, jpegFile);
fclose(jpegFile);
free(SrcImage);
}
}
}
}
}
else
{
cout << "id3v2 not present";
}
}
error message
Exception thrown: write access violation.
_Parent_proxy was 0x10011EE0.
If there is a handler for this exception, the program may be safely continued.
tell me how to fix it.