_execle, _wexecle

项目
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 _execle, _wexecle.

Loads and executes new child processes.

Important

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

Syntax

intptr_t _execle(   
   const char *cmdname,  
   const char *arg0,  
   ... const char *argn,  
   NULL,  
   const char *const *envp   
);  
intptr_t _wexecle(   
   const wchar_t *cmdname,  
   const wchar_t *arg0,  
   ... const wchar_t *argn,  
   NULL,  
   const char *const *envp   
);

Parameters

cmdname
Path of the file to execute.

arg0, ...``argn
List of pointers to parameters.

envp
Array of pointers to environment settings.

Return Value

If successful, these functions do not return to the calling process. A return value of –1 indicates an error, in which case the errno global variable is set.

`errno` value	Description
`E2BIG`	The space that's required for the arguments and the environment settings exceeds 32 KB.
`EACCES`	The specified file has a locking or sharing violation.
`EINVAL`	Invalid parameter.
`EMFILE`	Too many files are open. (The specified file must be opened to determine whether it is executable.)
`ENOENT`	The file or path is not found.
`ENOEXEC`	The specified file is not executable or has an invalid executable-file format.
`ENOMEM`	Not enough memory is available to execute the new process; the available memory has been corrupted; or an invalid block exists, which indicates that the calling process was not allocated correctly.

For more information about these return codes, see _doserrno, errno, _sys_errlist, and _sys_nerr.

Remarks

Each of these functions loads and executes a new process, and passes each command-line argument as a separate parameter and passes an array of pointers to environment settings.

The _execle functions validate their parameters. If cmdname or arg0 is a null pointer or an empty string, these functions invoke the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, these functions set errno to EINVAL and return -1. No new process is launched.

Requirements

Function	Required header	Optional header
`_execle`	<process.h>	<errno.h>
`_wexecle`	<process.h> or <wchar.h>	<errno.h>

For more information, see Compatibility.

Example

See the example in _exec, _wexec Functions.

通过