How do I write to file in binary in C?
Why does this code not work as expected?
#include开发者_JS百科 <cstdio>
int main()
{
char mona[] =
"\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52\x00\x00\x01\x90"
"\x00\x00\x02\x5d\x01\x03\x00\x00\x00\x26\xef\xb3\x78\x00\x00\x00\x45\x74\x45\x58"
// <snip>
"\x00\x49\x45\x4e\x44\xae\x42\x60\x82";
FILE *fp = fopen("mona.png","wb");
fputs(mona,fp);
fclose(fp);
return 0;
}
fputs
is supposed to write a null-terminated string. It will stop once a '\0'
is detected. You should use fwrite
to write binary data.
fwrite(mona, 1, sizeof(mona), fp);
Use fwrite
instead of fputs
.
fputs
is for writing character (not binary) data to files.
You must use fwrite AND the binary flag on fopen, like
fopen("blah.bin","wb");
If you dont use "b", all your file-operations will work in text-modus (standard) also with fwrite.
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