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Message: [QUOTE="loudking, post: 2864339"] Dear all, I encountered a problem with fread and fwrite. If I am going to copy a file using the same string, it will succeed char *file_content; struct stat buf; FILE *fp, *new_fp; fread(file_content, sizeof(char), buf.st_size, fp); fwrite(file_content, sizeof(char), buf.st_size, new_fp); If I duplicate that string, the new file will be different from the original one. char *bak; fread(file_content, sizeof(char), buf.st_size, fp); bak = strdup(file_content); fwrite(bak, sizeof(char), buf.st_size, new_fp); I checked the return value of both fread and fwrite, the result is identical. I even used strcmp to compare these two strings, but they are identical, too. so I don't know why this happens ... BTW: fp and new_fp points to pdf files. [/QUOTE]