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vb.netdelphisendmessagewm-copydata
Fred
Fred

Reputation: 21

How to send a short string from a Visual Basic application to a Delphi application?

I need to send a short string, (less than 30 bytes, but sent every second), from one VB application, to a Delphi application.. is this possible, using CopyDataStruct, WM_COPYDATA and SendMessage functions in Windows?

Upvotes: 1

Views: 948

Answers (2)

Paul Robinson
Paul Robinson

Reputation: 156

This sounds like the kind of thing that you would use DDE to accomplish. Another way would be to write a string into a temporary area in the registry and then call the other program to read it and delete the temporary registry key once finished. You could also pass the string as a parameter in the command line and just exec the program.

Upvotes: 0

David Heffernan
David Heffernan

Reputation: 612854

I would say that WM_COPYDATA is the perfect way to do this. You just need to get your Delphi main form, say, to implement a message handler for WM_COPYDATA.

At the Delphi end it looks something like this:

TMyMainForm = class(TForm)
protected
  procedure WMCopyData(var Msg: TWMCopyData); message WM_COPYDATA;
end;

procedure TMyMainForm.WMCopyData(var Msg: TWMCopyData);
begin
  //do something with Msg.lpData
end;

Your VB code will need to obtain the window handle of your Delphi main form.

Upvotes: 3

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