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Importante Es posible que este documento no represente los procedimientos recomendados para el desarrollo actual. Puede que los vínculos a las descargas y otros recursos ya no sean válidos. Encontrará aquí la versión que se recomienda en la actualidad.

memcmp, wmemcmp

Compare characters in two buffers.


int memcmp(
   const void *buf1,
   const void *buf2,
   size_t count
);
int wmemcmp(
   const wchar_t * buf1,
   const wchar_t * buf2,
   size_t count
);

Parameters

buf1

First buffer.

buf2

Second buffer.

count

Number of characters (bytes for memcmp, wide characters for wmemcmp).

The return value indicates the relationship between the buffers.

Return value Relationship of first count bytes of buf1 and buf2

< 0

buf1 less than buf2

0

buf1 identical to buf2

> 0

buf1 greater than buf2

Compares the first count characters of buf1 and buf2 and returns a value indicating their relationship.

Routine Required header Compatibility

memcmp

<memory.h> or <string.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

wmemcmp

<wchar.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For additional compatibility information, see Compatibility in the Introduction.

All versions of the C run-time libraries.

// crt_memcmp.c
/* This program uses memcmp to compare
 * the strings named first and second. If the first
 * 19 bytes of the strings are equal, the program
 * considers the strings to be equal.
 */

#include <string.h>
#include <stdio.h>

int main( void )
{
   char first[]  = "12345678901234567890";
   char second[] = "12345678901234567891";
   int int_arr1[] = {1,2,3,4};
   int int_arr2[] = {1,2,3,4};
   int result;

   printf( "Compare '%.19s' to '%.19s':\n", first, second );
   result = memcmp( first, second, 19 );
   if( result < 0 )
      printf( "First is less than second.\n" );
   else if( result == 0 )
      printf( "First is equal to second.\n" );
   else
      printf( "First is greater than second.\n" );

   printf( "Compare '%d,%d' to '%d,%d':\n", int_arr1[0], int_arr1[1], int_arr2[0], int_arr2[1]);
   result = memcmp( int_arr1, int_arr2, sizeof(int) * 2 );
   if( result < 0 )
      printf( "int_arr1 is less than int_arr2.\n" );
   else if( result == 0 )
      printf( "int_arr1 is equal to int_arr2.\n" );
   else 
      printf( "int_arr1 is greater than int_arr2.\n" );
}

Compare '1234567890123456789' to '1234567890123456789':
First is equal to second.
Compare '1,2' to '1,2':
int_arr1 is equal to int_arr2.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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