The Far East GetTextExtent API Fails with Null LPNFit

ID: Q176322

The information in this article applies to:

Microsoft Windows NT Workstation versions 3.51, 4.0
Microsoft Windows NT Server versions 3.51, 4.0
Microsoft Windows NT Server version 4.0, Terminal Server Edition

SYMPTOMS

For Far East versions of Windows NT that use DBCS character sets, passing a NULL LpnFit parameter to the GetTextExtentExPoint API may cause an access violation (AV). A Dr. Watson dialog box appears similar to:

An application error has occurred and an application error log is being
generated.

XXX.EXE

Exception: access violation (0xc0000005), Address: 0x77f52edb

NOTE: Xxx.exe is your custom application. Also, the address may be different, but the access violation code should be the same.

CAUSE

Debug analysis shows this error occurs the first time the contents of NULL LpnFit is accessed.

RESOLUTION

Obtain the updated Gdi32.dll file, for the Far East versions of Windows NT that use DBCS character sets.

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Microsoft has confirmed this to be a problem in Windows NT version 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords : NT4SP4Fix kbbug4.00 kbfix4.00.sp4 kbbug3.51 NTSrvWkst
Version : WinNT:3.51,4.0
Platform : winnt
Issue type : kbbug