How do I get latest clearcase label programmatically from C#?

Question

I am trying to put version information to my C# GUI framework retrieved from the latest ClearCase label. This was originally done from Visual Soursafe as below.

Answer 1

I believe this could be better achieved through a script, which would be called from your C# program.

But you may be able to directly call some COM objects, through the CAL interface provided with ClearCase.

The documentation for the interface can be accessed through ClearCase help (Start>Programs>Rational ClearCase>ClearCase Help), where there's an entry for "ClearCase Automation Library (CAL)". An alternate path is to look in the ClearCase/bin directory for "cc_cal.chm".

In VB, with CAL API, that would give something like:

Dim CC As New ClearCase.Application 
Dim labelID As String
Set aVersion = CC.Version("[Path-To]\BuildDCP.bat");
Set someLabels = Ver.Labels;
If (someLabels.Count > 0) Then 
    ' the first label listed is the most recently applied
    labelID = someLabels.Item(1).Type.Name
EndIf

Answer 2

I really wish that the COM interfaces had better documentation, or were more obvious. Or that the code to ClearCase Explorer or Project Explorer were open source.

I've done a few cool things, but I pretty much started by adding COM references to my C# project, and then started screwing around with the interfaces I found.

Good luck!