SetFileApisToOEM
VOID SetFileApisToOEM(VOID);
Parameters
Return value
Remarks
The SetFileApisToOEM function complements the SetFileApisToANSI function, which causes file I/O functions to use the ANSI character set code page.
The 8-bit console functions use the OEM code page by default. All other functions use the ANSI code page by default. This means that strings returned by the console functions may not be processed correctly by other functions, and vice versa. For example, if the FindFirstFileA function returns a string that contains certain extended ANSI characters, and the 8-bit console functions are set to use the OEM code page, then the WriteConsoleA function does not display the string properly.
Use the AreFileApisANSI function to determine which code page the set of file I/O functions is currently using. Use the SetConsoleCP and SetConsoleOutputCP functions to set the code page for the 8-bit console functions.
To solve the problem of code page incompatibility, it is best to use Unicode for console applications. Console applications that use Unicode are much more versatile than those that use 8-bit console functions. Barring that solution, a console application can call the SetFileApisToOEM to cause the set of file I/O functions to use OEM character set strings rather than ANSI character set strings. Use the SetFileApisToANSI to set those functions back to the ANSI code page.
The SetFileApisToANSI and SetFileApisToOEM functions affect the following set of Win32 file functions.
| Function | Description |
|---|---|
| _lopen
|
open existing file |
| CopyFile
|
copy file |
| CreateDirectory
|
create directory |
| CreateFile
|
create/open an object (file, pipe, etc.) |
| CreateProcess
|
create process |
| DeleteFile
|
delete file |
| FindFirstFile
|
start searching for a file object |
| FindNextFile
|
continue searching |
| GetCurrentDirectory
|
get the current directory |
| GetDiskFreeSpace
|
get disk info |
| GetDriveType
|
get drive type |
| GetFileAttributes
|
get file attributes |
| GetFullPathName
|
get path to a file |
| GetModuleFileName
|
get full name of the module |
| GetModuleHandle
|
get handle of the module |
| GetSystemDirectory
|
get path to the system directory |
| GetTempFileName
|
get name for a temporary file |
| GetTempPath
|
get path to the TEMP directory |
| GetVolumeInformation
|
get file system information |
| GetWindowsDirectory
|
get path to the Windows directory |
| LoadLibrary
|
load library (DLL) |
| LoadLibraryEx
|
load library (DLL) |
| MoveFile
|
move/rename file or directory |
| MoveFileEx
|
move/rename file or directory |
| OpenFile
|
create/open/delete file |
| RemoveDirectory
|
delete directory |
| SearchPath
|
search for a file |
| SetCurrentDirectory
|
set current directory |
| SetFileAttributes
|
set file attributes |
When dealing with command lines, a console application should obtain the command line in Unicode form and then convert it to OEM form using the relevant character-to-OEM functions. Note also that the array in the argv parameter contains ANSI character set strings in this case.