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Please help me in libpng1.2.33
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Hi All,
I am trying to read pixel values of a PNG file using turbo C. I use lingpng library files. I started with following code
FILE *fp = fopen(file_name, "rb");
if (!fp) return;
fread(header, 1, number, fp);
is_png = !png_sig_cmp(header, 0, number);
if (!is_png) return;
when complie this, it gives no error. but when I run (or build all) it, it gives the following error
"Linker error:Undefined symbol __png_sig_cmp in module"
Please can any one help me in this problem? Do you have any idea of what is missing here?
thank you very much
Nilmin
I am trying to read pixel values of a PNG file using turbo C. I use lingpng library files. I started with following code
FILE *fp = fopen(file_name, "rb");
if (!fp) return;
fread(header, 1, number, fp);
is_png = !png_sig_cmp(header, 0, number);
if (!is_png) return;
when complie this, it gives no error. but when I run (or build all) it, it gives the following error
"Linker error:Undefined symbol __png_sig_cmp in module"
Please can any one help me in this problem? Do you have any idea of what is missing here?
thank you very much
Nilmin
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Join Date: Dec 2005
Posts: 5,850
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Does libpng even work with such an ancient fossil compiler like turbo c ?
Consider using a compiler compatible with your OS.
Consider using a compiler compatible with your OS.
Like salem said, you would be better off with a decent compiler such as gcc. If its not a problem with your compiler, then I'd guess you are not linking the library properly. Its been a while, but I had a play around with libpng once I dumped the code here on my site. It should work assuming its linked and compiled correctly.
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