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Colin Robertson
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Replace or delete all obsolete KB references
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‎docs/atl-mfc-shared/date-and-time-automation-support.md‎

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The CRT correctly calculates a difference of 23 hours. `COleDateTimeSpan` calculates a difference of 24 hours.
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Note that a workaround is used near the end of the example to display the date properly using `COleDateTime::Format`. See the Knowledge Base article "BUG: Format("%D") Fails for `COleDateTime` and `COleDateTimeSpan`" (Q167338).
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[!code-cpp[NVC_ATLMFC_Utilities#176](../atl-mfc-shared/codesnippet/cpp/date-and-time-automation-support_1.cpp)]
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## See Also
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[Date and Time](../atl-mfc-shared/date-and-time.md)
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‎docs/atl-mfc-shared/exporting-string-classes-using-cstringt.md‎

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- With the new `CStringT` template class, you can customize `CString` behavior using template parameters that specify character traits, similar to the templates in the C++ Standard Library.
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- When you export your own string class from a DLL using `CStringT`, the compiler also automatically exports the `CString` base class. Since `CString` is itself a template class, it may be instantiated by the compiler when used, unless the compiler is aware that `CString` is imported from a DLL. If you have migrated projects from Visual C++ 6.0 to Visual C++.NET, you might have seen linker symbol errors for a multiply-defined `CString` because of the collision of the `CString` imported from a DLL and the locally instantiated version. The proper way to do this is described below. For more information on this issue, see the Knowledge Base article, "Linking Errors When you Import CString-derived Classes" (Q309801) at [http://support.microsoft.com/default.aspx](http://support.microsoft.com/default.aspx).
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- When you export your own string class from a DLL using `CStringT`, the compiler also automatically exports the `CString` base class. Since `CString` is itself a template class, it may be instantiated by the compiler when used, unless the compiler is aware that `CString` is imported from a DLL. If you have migrated projects from Visual C++ 6.0 to Visual C++.NET, you might have seen linker symbol errors for a multiply-defined `CString` because of the collision of the `CString` imported from a DLL and the locally instantiated version. The proper way to do this is described below.
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The following scenario will cause the linker to produce symbol errors for multiply defined classes. Assume that you are exporting a `CString`-derived class (`CMyString`) from an MFC extension DLL:
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‎docs/atl-mfc-shared/reference/cimage-class.md‎

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*eOrientation*<br/>
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Specifies the orientation of the bitmap. Can be one of the following:
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- DIBOR_DEFAULT The orientation of the bitmap is determined by the operating system. However, this may not always have the intended results on all operating systems. For more information on this, see the following Knowledge Base article (**Q186586**): PRB: GetObject() Always Returns Positive Height For DIB Sections.
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- DIBOR_DEFAULT The orientation of the bitmap is determined by the operating system.
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- DIBOR_BOTTOMUP The lines of the bitmap are in reverse order. This causes [CImage::GetBits](#getbits) to return a pointer near the end of the bitmap buffer and [CImage::GetPitch](#getpitch) to return a negative number.
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‎docs/atl-mfc-shared/reference/cstringt-class.md‎

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`CString`, `CStringA`, and `CStringW` are exported from the MFC DLL (MFC90.DLL), never from user DLLs. This is done to prevent `CStringT` from being multiply defined.
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> [!NOTE]
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> If your code contains the workaround for linker errors that is described in [Linking Errors When You Import CString-Derived Classes" (Q309801)](https://support.microsoft.com/help/309801/you-may-receive-an-lnk2019-error-message-when-you-build-a-visual-c-200), you should remove that code. It is no longer needed.
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> If your code contains the workaround for linker errors that is described in [Exporting String Classes Using CStringT](../../atl-mfc-shared/exporting-string-classes-using-cstringt.md), you should remove that code. It is no longer needed.
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The following string types are available within MFC-based applications:
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‎docs/build/dll-frequently-asked-questions.md‎

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## <a name="mfc_multithreaded_1"></a> Can an MFC DLL create multiple threads?
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Except during initialization, an MFC DLL can safely create multiple threads as long as it uses the Win32 thread local storage (TLS) functions such as **TlsAlloc** to allocate thread local storage. However, if an MFC DLL uses **__declspec(thread)** to allocate thread local storage, the client application must be implicitly linked to the DLL. If the client application explicitly links to the DLL, the call to **LoadLibrary** will not successfully load the DLL. For more information about creating multiple threads inside MFC DLLs, see the Knowledge Base article, "PRB: Calling LoadLibrary() to Load a DLL That Has Static TLS" (Q118816). For more information about thread-local variables in DLLs, see [thread](../cpp/thread.md).
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Except during initialization, an MFC DLL can safely create multiple threads as long as it uses the Win32 thread local storage (TLS) functions such as **TlsAlloc** to allocate thread local storage. However, if an MFC DLL uses **__declspec(thread)** to allocate thread local storage, the client application must be implicitly linked to the DLL. If the client application explicitly links to the DLL, the call to **LoadLibrary** will not successfully load the DLL. For more information about thread-local variables in DLLs, see [thread](../cpp/thread.md).
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An MFC DLL that creates a new MFC thread during startup will stop responding when it is loaded by an application. This includes whenever a thread is created by calling `AfxBeginThread` or `CWinThread::CreateThread` inside:
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- A supplied `DllMain` or **RawDllMain** function in an MFC extension DLL.
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For more information about creating threads during initialization, see the Knowledge Base article, "PRB: Cannot Create an MFC Thread During DLL Startup" (Q142243).
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## <a name="mfc_multithreaded_2"></a> Can a multithreaded application access an MFC DLL in different threads?
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Multithreaded applications can access regular MFC DLLs that dynamically link to MFC and MFC extension DLLs from different threads. And as of Visual C++ version 4.2, an application can access regular MFC DLLs that statically link to MFC from multiple threads created in the application.
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Prior to version 4.2, only one external thread could attach to a regular MFC DLL that statically linked to MFC. For more information about restrictions accessing regular MFC DLLs that statically link to MFC from multiple threads (prior to Visual C++ version 4.2), see the Knowledge Base article, "Multiple Threads and MFC _USRDLLs" (Q122676).
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Prior to version 4.2, only one external thread could attach to a regular MFC DLL that statically linked to MFC.
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Note that the term USRDLL is no longer used in the Visual C++ documentation. A regular MFC DLL that is statically linked to MFC has the same characteristics as the former USRDLL.
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‎docs/build/reference/md-mt-ld-use-run-time-library.md‎

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For more information about how to use the debug versions of the run-time libraries, see [C Run-Time Library Reference](../../c-runtime-library/c-run-time-library-reference.md).
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Knowledge Base article Q140584 also discusses how to choose the appropriate C run-time library.
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For more about DLLs, see [DLLs in Visual C++](../../build/dlls-in-visual-cpp.md).
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### To set this compiler option in the Visual Studio development environment

‎docs/error-messages/compiler-errors-1/compiler-error-c2059.md‎

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void func(ag_type arg = ag_type(5, 7.0)); // OK
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```
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You can also get C2059 if you define a member template class or function outside the class. For information, see [Knowledge Base article 241949](http://support.microsoft.com/kb/241949).
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C2059 can occur for an ill-formed cast.
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The following sample generates C2059:

‎docs/error-messages/compiler-errors-1/compiler-error-c2143.md‎

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The compiler expected a specific token (that is, a language element other than white space) and found another token instead.
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For information about this error when it occurs when you are using a function-try block, see [Knowledge Base article 241706](http://support.microsoft.com/kb/241706).
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Check the [C++ Language Reference](../../cpp/cpp-language-reference.md) to determine where code is syntactically incorrect. Because the compiler may report this error after it encounters the line that causes the problem, check several lines of code that precede the error.
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C2143 can occur in different situations.

‎docs/error-messages/compiler-errors-1/fatal-error-c1033.md‎

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cannot open program database pdb
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This error can be caused by disk error.
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For more information, see [http://support.microsoft.com/default.aspx?scid=kb;246007](http://support.microsoft.com/default.aspx?scid=kb;246007).
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This error can be caused by a disk error, a temporary lock created by an anti-virus program, a previous debugger instance that has not fully shut down, or parallel build mspdbsrv.exe processes that attempt to access the same file, among other possible causes.

‎docs/error-messages/compiler-errors-2/compiler-error-c2535.md‎

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If you get C2535 because of the Dispose function, see [Destructors and finalizers](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Destructors_and_finalizers) for more information.
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If you are compiling an ATL project, see Knowledge Base article Q241852.
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```

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