memset, wmemset

Visual Studio 2015

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at memset, wmemset.

Sets buffers to a specified character.

Syntax

  
      void *memset(  
   void *dest,  
   int c,  
   size_t count   
);  
wchar_t *wmemset(  
   wchar_t *dest,  
   wchar_t c,  
   size_t count  
);

Parameters

dest
Pointer to destination.

c
Character to set.

count
Number of characters.

Return Value

The value of dest.

Remarks

Sets the first count characters of dest to the character c.

Security Note Make sure that the destination buffer has enough room for at least count characters. For more information, see Avoiding Buffer Overruns.

Requirements

Routine	Required header
`memset`	<memory.h> or <string.h>
`wmemset`	<wchar.h>

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Example

// crt_memset.c  
/* This program uses memset to  
 * set the first four chars of buffer to "*".  
 */  
  
#include <memory.h>  
#include <stdio.h>  
  
int main( void )  
{  
   char buffer[] = "This is a test of the memset function";  
  
   printf( "Before: %s\n", buffer );  
   memset( buffer, '*', 4 );  
   printf( "After:  %s\n", buffer );  
}

Output

Before: This is a test of the memset function  
After:  **** is a test of the memset function

Here's an example of the use of wmemset:

// crt_wmemset.c  
/* This program uses memset to  
 * set the first four chars of buffer to "*".  
 */  
  
#include <wchar.h>  
#include <stdio.h>  
  
int main( void )  
{  
   wchar_t buffer[] = L"This is a test of the wmemset function";  
  
   wprintf( L"Before: %s\n", buffer );  
   wmemset( buffer, '*', 4 );  
   wprintf( L"After:  %s\n", buffer );  
}

Output

Before: This is a test of the wmemset function  
After:  **** is a test of the wmemset function

.NET Framework Equivalent

System::Buffer::SetByte