Get text from the focused control in the window issue

[JecyG]

// Approach 1: Use EM_GETSELTEXT (works for rich edit controls) wchar_t buffer[8192] = {0}; int textLength = SendMessageW(focusedControl, EM_GETSELTEXT, 0, (LPARAM)buffer);

You must first invoke OpenProcess to open the target process, then call VirtualAllocEx to allocate memory, followed by SendMessage(hwnd, EM_GETSELTEXT, 0, (LPARAM)pRemoteBuf); because the edit box window belongs to another process.

[0xfullex]

You're right, there is indeed a problem where the required memory content cannot be accessed across processes. I'm thinking that the Focused control may be redundant in the selection hook function, so I'll consider removing the Focused control entirely.