Name

Return Value

On success, gzwrite() shall return the number of uncompressed bytes actually written to file. On error gzwrite() shall return a value less than or equal to 0. Applications may examine the cause using gzerror().

Detailed Description

The gzwrite() function shall write data to the compressed file referenced by file, which shall have been opened in a write mode (see gzopen() and gzdopen()). On entry, buf shall point to a buffer containing lenbytes of uncompressed data. The gzwrite() function shall compress this data and write it to file. The gzwrite() function shall return the number of uncompressed bytes actually written.

Examples

#include <stdio.h>
#include <zlib.h>
void Gzwrite( )
  {
   
    gzFile file;
    uInt size ,len;
    const char *s="ritesh";
    len=strlen(s);
    const char * fname = TESTFILE ;
    file = gzopen(fname, "wb");
    size = gzwrite(file, (char*)s, (unsigned)strlen(s));
    printf("size is %d",size);
    gzclose(file);
  }

Size is 6.

Errors

On error, gzwrite() shall set the error number associated with the stream identified by file to indicate the error. Applications should use gzerror() to access this error value.