libpng 在 png_read_info(） 上崩溃

我正在尝试在vs2013中使用libpng 1.2.10读取png文件。我下载了最新的 zlib 并编译了 pnglib，效果很好。现在我正在尝试加载一个文件：

int *w = &width;
int *h = &height;
const char* name = file.c_str();
FILE *png_file = fopen(name, "rb");
if (!png_file)
{
    std::cerr << "Could not open " + file << std::endl;
    return;
}
unsigned char header[PNG_SIG_BYTES];
fread(header, 1, PNG_SIG_BYTES, png_file);
if (png_sig_cmp(header, 0, PNG_SIG_BYTES))
{
    std::cerr << "PNG signature fail " + file << std::endl;
    return;
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(png_ptr == NULL)
{
    std::cerr << "PNG read fail " + file << std::endl;
    return;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr)
{
    std::cerr << "PNG info fail " + file << std::endl;
    return;
}
png_infop end_info = png_create_info_struct(png_ptr);
if(!end_info)
{
    std::cerr << "PNG info end fail " + file << std::endl;
    return;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
    std::cerr << "PNG setjmp fail " + file << std::endl;
    return;
}
png_init_io(png_ptr, png_file);
png_set_sig_bytes(png_ptr, PNG_SIG_BYTES);
png_read_info(png_ptr, info_ptr);
*w = png_get_image_width(png_ptr, info_ptr);
*h = png_get_image_height(png_ptr, info_ptr);
png_uint_32 bit_depth, color_type;
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
{
    std::cerr << "Grayscale PNG not supported " + file << std::endl;
    return;
}
if (bit_depth == 16)
    png_set_strip_16(png_ptr);
if (color_type == PNG_COLOR_TYPE_PALETTE)
    png_set_palette_to_rgb(png_ptr);
else if (color_type == PNG_COLOR_TYPE_GRAY ||
    color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
    png_set_gray_to_rgb(png_ptr);
}
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
    png_set_tRNS_to_alpha(png_ptr);
else
    png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
png_uint_32 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
png_uint_32 numbytes = rowbytes*(height);
png_byte* pixels = (png_byte*)malloc(numbytes);
png_byte** row_ptrs = (png_byte**)malloc((height)* sizeof(png_byte*));
int i;
for (i = 0; i<height; i++)
    row_ptrs[i] = pixels + (height - 1 - i)*rowbytes;
png_read_image(png_ptr, row_ptrs);
free(row_ptrs);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(png_file);
//return (char *)pixels;
Create(*w, *h, 4, pixels, GL_UNSIGNED_BYTE);

不幸的是，我得到了

在 SimpleShader.exe 中0x77D78E19 （ntdll.dll） 处未处理的异常： 0xC0000005：访问冲突写入位置0x00000014。

在线

    png_read_info(png_ptr, info_ptr);

具体来说，错误发生在这里：

#ifdef PNG_STDIO_SUPPORTED
/* This is the function that does the actual reading of data.  If you are
 * not reading from a standard C stream, you should create a replacement
 * read_data function and use it at run time with png_set_read_fn(), rather
 * than changing the library.
 */
void PNGCBAPI
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
   png_size_t check;
   if (png_ptr == NULL)
      return;
   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
    * instead of an int, which is what fread() actually returns.
    */
   check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr)); // <---------- ERROR HERE
   if (check != length)
      png_error(png_ptr, "Read Error");
}
#endif

可能是什么问题？

编辑：好的，当我在发布模式下编译libpng和我的项目时，它不会崩溃。我需要在调试模式下运行我的项目...