Notepad

[eacbypass]

Trying to inject into notepad with this method seems to not work, and it also doesnt work for any other processes i've tried.

[realbadidas]

make sure you use the window name as the string you input is handled with "FindWindowA".
if you want to use for example a path or name of the executable you need to iterate through all processes, check the file path or whatever and then get the HWND from there