strcpy, wcscpy, _mbscpy

Article
06/05/2017

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 strcpy, wcscpy, _mbscpy.

Copies a string. More secure versions of these functions are available; see strcpy_s, wcscpy_s, _mbscpy_s.

Important

_mbscpy cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

char *strcpy(  
   char *strDestination,  
   const char *strSource   
);  
wchar_t *wcscpy(  
   wchar_t *strDestination,  
   const wchar_t *strSource   
);  
unsigned char *_mbscpy(  
   unsigned char *strDestination,  
   const unsigned char *strSource   
);  
template <size_t size>  
char *strcpy(  
   char (&strDestination)[size],  
   const char *strSource   
); // C++ only  
template <size_t size>  
wchar_t *wcscpy(  
   wchar_t (&strDestination)[size],  
   const wchar_t *strSource   
); // C++ only  
template <size_t size>  
unsigned char *_mbscpy(  
   unsigned char (&strDestination)[size],  
   const unsigned char *strSource   
); // C++ only

Parameters

strDestination
Destination string.

strSource
Null-terminated source string.

Return Value

Each of these functions returns the destination string. No return value is reserved to indicate an error.

Remarks

The strcpy function copies strSource, including the terminating null character, to the location that's specified by strDestination. The behavior of strcpy is undefined if the source and destination strings overlap.

Important

Because strcpy does not check for sufficient space in strDestination before it copies strSource, it is a potential cause of buffer overruns. Therefore, we recommend that you use strcpy_s instead.

wcscpy and _mbscpy are, respectively, wide-character and multibyte-character versions of strcpy. The arguments and return value of wcscpy are wide-character strings; those of _mbscpy are multibyte-character strings. These three functions behave identically otherwise.

In C++, these functions have template overloads that invoke the newer, secure counterparts of these functions. For more information, see Secure Template Overloads.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
`_tcscpy`	`strcpy`	`_mbscpy`	`wcscpy`

Requirements

Routine	Required header
`strcpy`	<string.h>
`wcscpy`	<string.h> or <wchar.h>
`_mbscpy`	<mbstring.h>

For additional compatibility information, see Compatibility.

Example

// crt_strcpy.c  
// compile with: /W3  
// This program uses strcpy  
// and strcat to build a phrase.  
  
#include <string.h>  
#include <stdio.h>  
  
int main( void )  
{  
   char string[80];  
  
   // If you change the previous line to  
   //   char string[20];  
   // strcpy and strcat will happily overrun the string  
   // buffer.  See the examples for strncpy and strncat  
   // for safer string handling.  
  
   strcpy( string, "Hello world from " ); // C4996  
   // Note: strcpy is deprecated; use strcpy_s instead  
   strcat( string, "strcpy " );           // C4996  
   // Note: strcat is deprecated; use strcat_s instead  
   strcat( string, "and " );              // C4996  
   strcat( string, "strcat!" );           // C4996  
   printf( "String = %s\n", string );  
}

String = Hello world from strcpy and strcat!

.NET Framework Equivalent

System::String::Copy

Partager via