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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| WinNT
| Platform Notes
| None
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QueryDosDevice
The QueryDosDevice function lets an application obtain information about MS-DOS device names.
The function can obtain the current mapping for a particular MS-DOS device name.
The function can also obtain a list of all existing MS-DOS device names.
MS-DOS device names are stored as symbolic links in the Windows NT object name
space. The code that converts an MS-DOS path into a corresponding Windows NT
path uses these symbolic links to map MS-DOS devices and drive letters. The QueryDosDevice function provides a mechanism whereby a Win32-based application can query the
names of the symbolic links used to implement the MS-DOS device namespace as
well as the value of each specific symbolic link.
DWORD QueryDosDevice(
LPCTSTR lpDeviceName,
| // address of MS-DOS device name string
| LPTSTR lpTargetPath,
| // address of buffer for storing query results
| DWORD ucchMax
| // maximum storage capacity of buffer
| );
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Parameters
lpDeviceName
Pointer to an MS-DOS device name string specifying the target of the query.
This parameter can be NULL. In that case, the QueryDosDevice function will store a list of all existing MS-DOS device names into the
buffer pointed to by lpTargetPath.
lpTargetPath
Pointer to a buffer that will receive the result of the query. The function
fills this buffer with one or more null-terminated strings. The final
null-terminated string is followed by an additional NULL.
If lpDeviceName is non-NULL, the function obtains information about the particular MS-DOS
device specified by lpDeviceName. The first null-terminated string stored into the buffer is the current
mapping for the device. The other null-terminated strings represent undeleted prior
mappings for the device.
If lpDeviceName is NULL, the function obtains a list of all existing MS-DOS device names.
Each null-terminated string stored into the buffer is the name of an existing
MS-DOS device.
ucchMax
Specifies the maximum number of characters that can be stored into the buffer
pointed to by lpTargetPath.
Return Values
If the function succeeds, the return value is the number of characters stored
into the buffer pointed to by lpTargetPath.
If the function fails, the return value is zero. To get extended error
information, call GetLastError.
Remarks
The DefineDosDevice function provides a means whereby a Win32-based application can create and
modify the symbolic links used to implement the MS-DOS device namespace.
MS-DOS device names are global. Once defined, an MS-DOS device name remains
visible to all processes until either it is explicity removed or the system
reboots.
See Also
DefineDosDevice
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