How can I convert Visio binary file (.vsd extension) to Visio xml file(.vdx extension) in programming?
Does Microsoft provide such C/C++ library ?
Answer
Option 1: Use Visio application programmatically
Any .NET language can control Visio through it's COM automation interfaces and use its SaveAs method.
mydoc.SaveAs("d:\\foo.vdx");
This option, obviously requires the Visio application to be installed.
Option 2: Use a third party library
I've never used it but apparently Aspose.Diagram for .NET can be used to convert these files.
Microsoft Library?
To answer your last question: No, Microsoft does not provide a C/C++ library to perform this conversion.