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Editorial Team
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Asked: 2026-05-24T12:26:08+00:00

We have an old Windows 32 bit app written in C++ which does some

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We have an old Windows 32 bit app written in C++ which does some stuff and displays the results in what resembles a textbox.

I have been ask to write an application in C# that reads the data out of the old app and then further process the data.

The issue is how do I read the textbox in the old application?

Someone told me I can get the “handle “of the application using windows API and step through the controls and then read each ones data! Is this true and if so how would I do it from C#?

This is to be a .Net 4 Windows forms Application.

Many thanks

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1 Answer

  1. Editorial Team

    You’re probably going to have to use some Interop calls to accomplish this, specifically using a combination of FindWindow / FindWindowEx and SendMessage & WM_GETTEXT / WM_GETTEXTLENGTH.

    Here is an article on the subject (in c++, however the same concepts will just need to be ported to use P/Invoke), it’s a bit dated but I believe is should be very relevant to your situation.

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