Relative path problem for a deployed win32 application

I have written a c++ program and deployed it in say c:\my_app, and my executable's path is c:\my_app\my_app.exe. Say, my_app needs many files such as the_file.txt, which is located in c:\my_app\the_file.txt.

In my executable, I open the txt file as, xx.open("the_fi开发者_Python百科le.txt");

Moreover, I have associated my program with let's say .myp extension.

When I'm on Desktop, and want to open a file named example.myp, my program can not see the_file.txt. Because, it (somehow) assumes that it's currently working on Desktop.

Is there any easy way to handle this problem by changing shell command for open in HKEY_CLASSES_ROOT? The naive solution would be to change all file open operations with something like %my_app_location/the_file.txt". I don't want to do that.

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Always use a full path name to open a file. In other words, don't open "foo.txt", open "c:\bar\foo.txt". To find the install directory of your EXE use GetModuleFileName(), passing NULL for the module handle.

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These days you shouldn't add files to c:\my_app.... Instead use the ProgramData Folder and full paths.

Use SHGetSpecialFolderPathA with CSIDL_COMMON_APPDATA to get the ProgramData folder and the create your program directory and add your files.

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You should set current directory for your app's folder with SetCurrentDirectory function. After that you can open file by name without full path