Microsoft KB Archive/113588

= FIX: Assertion, VIEWSCRL.CPP, Line 455 with SetScaleToFitSize =

Article ID: 113588

Article Last Modified on 11/21/2006

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APPLIES TO


 * Microsoft Foundation Class Library 4.2, when used with:
 * Microsoft Visual C++ 1.0 Professional Edition

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This article was previously published under Q113588



SYMPTOMS
Calling SetScaleToFitSize in OnInitialUpdate of a CFormView derived class causes the following assertion to fail:

File viewscrl.cpp, Line 455, Assertion Failed!



CAUSE
Because the view window has not yet been displayed, SetScaleToFitSize uses the size of the CFormView. Because the CFormView is created with size CRect(0,0,0,0), the view size is miscalculated.



RESOLUTION
To set the view window size before calling SetScaleToFitSize, call RecalcLayout on the parent frame. For example: GetParentFrame->RecalcLayout; See the sample code below for an example of this.



STATUS
Microsoft has confirmed this to be a problem in the Microsoft Foundation Classes (MFC) version 2.0. This problem was corrected in the Microsoft Foundation Classes version 2.5.



MORE INFORMATION
The call to RecalcLayout in OnInitialUpdate is no longer needed with MFC version 2.5 because the framework takes care of calling RecalcLayout in response to the WM_CREATE message before the call to OnInitialUpdate is made.

Sample Code
/* Compile options needed: none

void CMyFormView::OnInitialUpdate {   CFormView::OnInitialUpdate;     // Base class initialization.

//GetParentFrame->RecalcLayout // Uncomment to fix. No need to                                     // call if this is version 2.5. CSize mysize(100,100);

SetScaleToFitSize(mysize);       // This will ASSERT in version // 2.0 unless RecalcLayout is                                     // called. }

Additional query words: 1.00 2.00 2.10 kbNoUpdate

Keywords: kbbug kbdocview kbfix kbvc150fix KB113588

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