C++獲取GIF圖片的長和寬

bool GetGifSize(const char* file_path, int* width, int* height)
{
bool has_image_size = false;
int file_size;
*height = -1;
*width = -1;
file_size = -1;
FILE * fp = fopen(file_path, “rb”);
if (fp == NULL)
return has_image_size;
struct stat st;
char sigBuf[26];
if (fstat(fileno(fp), &st) < 0)
{
fclose(fp);
return has_image_size;
}
else
{
file_size = st.st_size;
}
if (fread(&sigBuf, 26, 1, fp) < 1)
{
fclose(fp);
return has_image_size;
}

char* gif87_signature = "GIF87a";
char* gif89_signature = "GIF89a";

if ((file_size >= 10) && (memcmp(sigBuf, gif87_signature, strlen(gif87_signature)) == 0 || memcmp(sigBuf, gif89_signature, strlen(gif89_signature)) == 0))
{
	// image type: gif
	unsigned short* size_info = (unsigned short*)(sigBuf + 6);
	*width = size_info[0];
	*height = size_info[1];
	has_image_size = true;
}
if (fp != NULL)
	fclose(fp);
return has_image_size;

}

int main（）
{
char[MAX_PATH] file_path=“d://123.gif”;
int nImgWidth;
int nImgHeight;
GetGifSize(file_path,&nImgWidth, &nImgHeight);
}