Microsoft KB Archive/248194

Knowledge Base

BUG: get_Version returns S_OK even if the version does not exist

Article ID: 248194

Article Last Modified on 7/20/2005

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APPLIES TO

• Microsoft Visual SourceSafe 5.0 Standard Edition
• Microsoft Visual SourceSafe 6.0 Standard Edition

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This article was previously published under Q248194

SYMPTOMS

When trying to get a specific version of a file or project, the get_Version function returns successfully and has a valid item even if that item does not exist in the database.

RESOLUTION

Instead of checking the HRESULT or whether the IVSSItem is not null, check the get_VersionNumber after calling get_Version. Compare the version numbers to make sure the version is valid. For example, place the following code inside the pVdb->get_VSSItem if statement:

// Used to store the latest version number of the item
long originalnumber, num;

// Store the latest version number of the item
vssi->get_VersionNumber(&originalnumber);

// Get the version at the label (this label will fail)
CComVariant varLabel = -51;
vssi->get_Version(varLabel, &vx);

// Get the version number of the returned item
vx->get_VersionNumber(&num);

// Compare the versions and see if the item is valid
if ( num > 0 && num <= originalnumber )
   printf("Valid label.");

// Release the item
vx->Release();

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Steps to reproduce the behavior

1. Create a Win32 Console Application in Microsoft Visual C++.

2. Add the following code to the project.
   
   Note This is the same code as in the following Microsoft Knowledge Base Article:

   169927 How to get history using SourceSafe OLE automation in C++

   #include <atlbase.h>
   #include <comdef.h>
   #include <initguid.h>
   #include "ssauto.h"
   
   int main ()
   {
      CLSID clsid;
      IClassFactory *pClf;
      IVSSDatabase *pVdb;
      BSTR bstrPath = SysAllocString(L"c:\\Program Files\\Microsoft Visual Studio\\Common\\VSS\\srcsafe.ini");
      BSTR bstrUName = SysAllocString(L"guest");
      BSTR bstrUPass = SysAllocString(L"");
   
      CoInitialize(0);
      if(S_OK == CLSIDFromProgID(L"SourceSafe", &clsid ))
      {
         if(S_OK == CoGetClassObject( clsid, CLSCTX_ALL, NULL,
            IID_IClassFactory, (void**)&pClf ))
         {
            if(S_OK == pClf->CreateInstance( NULL, IID_IVSSDatabase,
               (void **) &pVdb ))
            {
               if(S_OK == pVdb->Open(bstrPath, bstrUName, bstrUPass))
               {
                  // Get the root project
                  BSTR bstrName = SysAllocString(L"$/");
                  IVSSItem *vx;
                  IVSSItem *vssi;
   
                  if( S_OK == pVdb->get_VSSItem(bstrName, FALSE, &vssi) )
                  {
                     // Get the version at the label (this label should fail)
                     CComVariant varLabel = -51;
                     if( S_OK == vssi->get_Version(varLabel, &vx) )
                     {
                        // This prints out even though the label in invalid
                        printf("Should not be here.");
   
                        vx->Release();
                     }
   
                     vssi->Release();
                  }
   
                  SysFreeString(bstrName);
               }
   
               pVdb->Release();
            }
   
            pClf->Release();
         }
      }
   
      CoUninitialize();
   
      SysFreeString(bstrPath);
      SysFreeString(bstrUName);
      SysFreeString(bstrUPass);
      return 0;
   }

3. Download and add the ssauto.h header file that is used to integrate with Visual SourceSafe from the following Microsoft Web site:

   http://www.msdn.microsoft.com/vstudio/previous/ssafe/downloads/samples/

4. Run the program.

REFERENCES

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

196197 You receive an error message when you get a file from a project label by using OLE automation

Additional query words: ssauto

Keywords: kbbug kbnofix kbautomation KB248194

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