Q169927: HOWTO: Get History Using SourceSafe OLE Automation in C++
Article: Q169927
Product(s): Microsoft SourceSafe
Version(s): WINDOWS:5.0,6.0
Operating System(s):
Keyword(s): kbSSafe500 kbSSafe600
Last Modified: 01-MAY-2001
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The information in this article applies to:
- Microsoft Visual SourceSafe for Windows, versions 5.0, 6.0
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SUMMARY
=======
The sample code in this article, along with the description of the structures
and functions used, provides a guide to retrieving a collection of SourceSafe
items and getting the history for these items. The sample code is written in
C++.
MORE INFORMATION
================
The SourceSafe Object Model contains 7 objects. The top-most of these objects is
the VSSDatabase object. The first step in any SourceSafe OLE Automation client
is to make a connection to a VSSDatabase pointer through the IClassFactory
interface. This article assumes that there is already a pointer to the
VSSDatabase object. For more information about getting a VSSDatabase pointer,
please see the following Knowledge Base article:
Q169928 HOWTO: Open a SourceSafe Database with OLE Automation in C++
There are several operations available from the VSSItem object that produce
collections. The Items property returns a collection of all children associated
with a VSSItem, this is useful for listing all the children of a SourceSafe
Project. The Checkouts property returns a collection of all checkouts on a file
in Sourcesafe.
The method discussed in this article is the Versions method, which returns a
collection of Version objects. These represent old versions, labels and other
actions that have been applied to the file or project in SourceSafe during its
lifetime.
Once you have a pointer to a valid IVSSItem, call the get_Versions method.
get_Versions requires a long integer containing a number representing flag
values, and a pointer to a pointer to an IVSSVersions object.
Call the _NewEnum method from pointer to IVSSVersions passing a pointer to an
LPUNKNOWN. Then QueryInterface on the LPUNKNOWN for an IEnumVARIANT interface.
The IEnumVARIANT Interface supports Next, Skip, and Reset methods. Using the
Next Method within a while loop allows you to retrieve each version within the
collection using the punkVal property to get a pointer to IUnknown.
Sample Code
-----------
#include <windows.h>
#include <ocidl.h>
#include <stdio.h>
#include "ssauto.h"
void ListVersions( IVSSDatabase* db, LPCSTR path )
{
BSTR bstrval;
char lpbuf[200];
char lpbuf2[200];
IVSSItem *vssi;
IVSSVersion *vers;
IVSSVersions *vx;
LPUNKNOWN lpunk;
IEnumVARIANT *ppvobj;
VARIANT st;
OLECHAR* svalue;
BSTR bstrValue;
int x;
ULONG fetched;
long lvnum;
if( (x = MultiByteToWideChar(CP_ACP, 0, path, -1, svalue, 0 )) != 1)
{
svalue = new OLECHAR[x];
if( MultiByteToWideChar(CP_ACP, 0, path, -1, svalue, x ) == 0 )
MessageBox(NULL, "Error in Conversion", "Multibytetowide", MB_OK);
}
else
svalue = L"";
bstrValue = SysAllocString(svalue);
if( S_OK == db->get_VSSItem(bstrValue, FALSE, &vssi) )
{
if( S_OK == vssi->get_Versions( 0l, &vx ) )
{
if( S_OK == vx->_NewEnum(&lpunk) )
{
if(!FAILED(lpunk->
QueryInterface(IID_IEnumVARIANT, (void**)&ppvobj)))
{
vssi->get_Spec( &bstrval );
x = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)bstrval, -1,
lpbuf, sizeof(lpbuf), NULL, NULL );
printf("History of: %s\n", lpbuf );
printf("ACTION USER NAME VERSION NUMBER\n");
do
{
ppvobj->Next( 1UL, &st, &fetched );
if( fetched != 0 )
{
if(!FAILED(st.punkVal->
QueryInterface(IID_IVSSVersion,(void**)&vers)))
{
vers->get_Action( &bstrval );
WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)bstrval, -1,
lpbuf, sizeof(lpbuf), NULL, NULL );
vers->get_Username( &bstrval );
WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)bstrval, -1,
lpbuf2, sizeof( lpbuf2 ), NULL, NULL );
vers->get_VersionNumber( &lvnum );
printf("%s %s %ld\n", lpbuf, lpbuf2, lvnum );
vers->Release();
}
st.punkVal->Release();
}
} while( fetched != 0 );
ppvobj->Release();
}
lpunk->Release();
}
vx->Release();
}
vssi->Release();
}
SysFreeString(bstrValue);
}
REFERENCES
==========
MSDN Library: IClassFactory; IEnumVARIANT Interface; Visual SourceSafe OLE
Automation
You can download the header file ssauto.h from the following Web site:
http://www.msdn.microsoft.com/SSAFE
Additional query words:
======================================================================
Keywords : kbSSafe500 kbSSafe600
Technology : kbSSafeSearch kbAudDeveloper kbSSafe600 kbSSafe500
Version : WINDOWS:5.0,6.0
Issue type : kbhowto
=============================================================================
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