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MSLU: reported bugs and known issues
(The Microsoft Layer for Unicode on Windows 95, 98, and Me Systems)
(Originally posted 27 April 2002; last updated 10 December 2004)
By popular request, this page is going to list known issues that are either under investigation or fixed for a future release. Most issues start life being reported
in the microsoft.public.platformsdk.mslayerforunicode newsgroup on the msnews.microsoft.com news server and you can often see discussion about the issues there while
they are under investigation.
If you have any questions about or problems with MSLU, whether or not they are related to issues listed below, you should feel free to ask them in the
mslayerforunicode newsgroup (available via both NNTP and
HTML). You can also come by with
good news, if you want to. :-)
The latest Platform SDK contains a UnicoWS.lib file that was build using the VC++ 7.0 compiler, and the format is not 100% compatible with the linker in VC++ 6.0. In order to use the .LIB file, you need to either not use the /DEBUG flag or use VC++ 7.0. This problem will be addressed in the next PSDK update.
On a Windows 95 system with no net installed, no mpr.dll is on the system. This will cause a LoadLibrary() of unicows.dll to fail since it cannot bind to any of the WNet* functions that MSLU needs. The easy workaround is to just install the net on the target Win95 machine -- I have not seen such a machine in years and can't imagine that such machines are installing new software....
If you have a RichEdit control supporting Unicode (using the RichEd20W class name) and you attempt to use the GetWindowTextW API or the WM_GETTEXT message to retrieve the text it contains, the text will be garbled. A fix is not currently under consideration because the EM_GETTEXTEX message is available and will work properly, and it will not convert the text via the default system codepage the way that MSLU would for WM_GETTEXT or GetWindowTextW.
When MSLU's BeginUpdateResourceW and BeginUpdateResourceA APIs are called on binaries with no resources with the bDeleteExistingResources parameter set to FALSE, MSLU's call to LoadLibraryExA with the LOAD_LIBRARY_AS_DATAFILE flag to enumerate existing resources will fail and GetLastError() will return ERROR_BAD_FORMAT. This is a limitation of the Win9x function and there is no workaround for this, other than to simply pass TRUE when there are no resources in the binary upon which you plan to call the resource updating functions (since MSLU cannot afford to risk calling without LOAD_LIBRARY_AS_DATAFILE and causing code to run).
GetLogicalDriveStringsW not properly handling nBufferLength==0 -- this API should support the ability to pass an nBufferLength of 0 in order to get the full size to call the API with. As a workaround, you can simply call it with nBufferLength==1 (which would obviously be too small) and use that to get the size.
FindResourceW and FindResourceExW not accepting string parameters -- the lpName and lpType parameters do not work when they are strings. As a workaround, you can use numeric parameters for them, instead (and use the MAKEINTRESOURCE macro).
CompareStringW is not properly handling when either string is of zero length (an error is returned rather than doing a comparison, an overeager "out of memory" bug fix).
GetOpenFileNameW and GetSaveFileNameW are not updating the nFilterIndex member unless the lpstrCustomFilter member points to a valid string. To workaround, put a valid string in that member.
ModifyMenuW's lpNewItem member is always being treated as a string, even though it may not be one.
OemToCharW and CharToOemW are not null-terminating the converted strings, something that the OS does (although this is not explicitly documented).
SetWindowTextW is not treating a NULL lpString the same way as it treats TEXT(""). As a workaround, you can either use TEXT("") or you can call WM_SETTEXT directly.
SearchPathW randomly fails on CJK platforms.
Several problems have been reported with IMEs not properly allowing characters to be entered -- not on all IMEs, though.
Char[Lower|Upper][Buff] crashing when called several thousand times (exact number varies).
On Windows Me, GetOpenFileNameW and GetSaveFileNameW do not support the Places Bar even if the caller uses the new (5.0) version of the structure.
The Platform SDK mistakenly claimed that the following APIs supported Unicode on all platforms: CryptAcquireContext, CryptSignHash, CryptVerifySignature, CryptSetProvider, CryptSetProviderEx, CryptGetDefaultProvider, CryptEnumProviderTypes, and CryptEnumProviders. In truth, There is no support for the Unicode versions of these functions on Win9x. Stubs will be added to MSLU for the next release, so that people who want to call these APIs can use MSLU and implement these functions as overrides (the Platform SDK documentation bug has also been reported and will also be resolved).
WriteProfileSectionW and WritePrivateProfileSectionW are only using the first string passed in to lpString.
GetPrivateProfileSectionW, GetProfileSectionW, and GetPrivateProfileSectionNamesW are all documented as returning the number of characters copied to the specified buffer, not including the terminating NULL character, but currently the NULL character is being included in the return value.
CreateEnhMetaFileW is not properly handling the lpDescription parameter unless it is NULL.
When dealing with DBCS strings, the GetTextExtentExPointW API will return the lpnFit parameter in bytes rather than charactrers.
This page is obviously not on the Microsoft web site, but it is maintained by an employee of Microsoft who is the principal developer for MSLU. Certain factors
beyond normal control can cause there to be a difference between what you see here and what is eventually released. As they say, this posting is provided "AS IS"
with no warranties, and confers no rights. With that said, best efforts to keep this page accurate will be made any time such a difference does, in fact, exist.
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