fread( data, 1, width * height * 3, file );
fclose( file );

Here's your problem, you can't read directly from a png file, it's compressed. You need to decompress it first in order to get any useful data. I would recommend using an image loading library like FreeImage or SOIL.

thanks icOde.

i wonder whether it is compatible with msvc 2010 c++?  i tried to load the sln file into vc 2010, but it failed.

fread( data, 1, width * height * 3, file );
fclose( file );

Here's your problem, you can't read directly from a png file, it's compressed. You need to decompress it first in order to get any useful data. I would recommend using an image loading library like FreeImage or SOIL.

thanks icOde.

i wonder whether it is compatible with msvc 2010 c++?