_chdrive

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12/18/2017

The latest version of this topic can be found at _chdrive.

Changes the current working drive.

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

int _chdrive(   
   int drive   
);

Parameters

drive
An integer from 1 through 26 that specifies the current working drive (1=A, 2=B, and so forth).

Return Value

Zero (0) if the current working drive was changed successfully; otherwise, -1.

Remarks

If drive is not in the range from 1 through 26, the invalid-parameter handler is invoked as described in Parameter Validation. If execution is allowed to continue, the _chdrive function returns -1, errno is set to EACCES, and _doserrno is set to ERROR_INVALID_DRIVE.

The _chdrive function is not thread-safe because it depends on the SetCurrentDirectory function, which is itself not thread-safe. To use _chdrive safely in a multi-threaded application, you must provide your own thread synchronization. For more information, go to MSDN Library and then search for SetCurrentDirectory.

The _chdrive function changes only the current working drive; _chdir changes the current working directory.

Requirements

Routine	Required header
_chdrive	<direct.h>

For more information, see Compatibility.

Example

See the example for _getdrive.

.NET Framework Equivalent

System::Environment::CurrentDirectory

共用方式為