ag1976

Thanks a lot for your help. I tried to solve this problem with shared variables and it seems to works. But as always there is another problem how to close add_file_to_data_viewer.exe window after it runs data_viewer.exe. I though it would be trivial problem to code but it is not. Anyway thanks for your help (if you have any other idea or examples how to solve it would be great) Regards Andrzej I don't know how it would help?

Hello, I would need to prepare program for visualizing data with certain extension e.g. "*.dat". My idea was to create one program called e.g. "data_viewer.exe" Second program called "add_file_to_data_viewer.exe". Idea is that in the moment I click on *.dat file (I use windows 7), program "add_file_to_data_viewer.exe" starts "data_viewer.exe" (if need) and add file path to "data_viewer.exe". After it "add_file_to_data_viewer.exe" is closed. When I click on another *.dat file, "add_file_to_data_viewer.exe" adds second file path to the "data_viewer.exe" and so on. Only one instance of "data_viewer.exe" is allowed. Question what is the best way to communicate between "add_file_to_data_viewer.exe" and "data_viewer.exe"? Is it possible to do it without "add_file_to_data_viewer.exe" program? Thank you for any suggestions or ideas Regards Andrzej