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c:stdio.h:vfprintf

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c:stdio.h:vfprintf [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +====== vfprintf ======
 +
 +<code c>
 +int vfprintf(FILE *stream, const char *format, va_list arg);
 +</code>
 +Equivalent to fprintf with variable argument list replaced by arg, which must have been initialised by the va_start macro (and may have been used in calls to va_arg).
 +
 +===== C Sourcecode Example =====
 +<code c>
 +/* 
 + * vfprintf example code
 + * http://code-reference.com/c/stdio.h/vfprintf 
 + */
 +
 +#include <stdio.h> /* including standard library */
 +//#include <windows.h> /* uncomment this for Windows */
 +
 +#include <stdarg.h>
 +
 +int myfprintf( FILE *file, char const * format, ... )
 +{
 +  va_list args;
 +  int n;
 +  
 +  va_start( args, format );
 +  n=vfprintf( file, format, args );
 +  va_end( args );
 +  fputs("vfprintf test line\n", file);
 +  
 +  return n;
 +}
 +
 +int main (void)
 +{
 +  char string[] ="Hello";
 +  FILE * stream = fopen("test.txt","w");
 +  if(stream == 0) {
 +   perror("file problem");
 +  }
 +   
 +   myfprintf( stream, " %s World\n", string);
 +   
 +   fclose(stream);
 +
 +   return 0;
 +}
 +
 +</code>
 +
 +==== output ====
 +
 +== test.txt ==
 +<code c>
 +Hello World
 +vfprintf test line
 +</code>
 +
 +
 +    
  
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c/stdio.h/vfprintf.txt · Last modified: 2013/01/22 22:02 (external edit)

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