I got a notepad which has a PID: 2860
#include <iostream>
#include <windows.h>
#include <psapi.h>
using namespace std;
HWND SendIt (DWORD dwProcessID){
HWND hwnd = NULL;
do {
hwnd = FindWindowEx(NULL, hwnd, NULL, NULL);
DWORD dwPID = 0;
GetWindowThreadProcessId(hwnd, &dwPID);
if (dwPID == dwProcessID) {
cout<<"yay:"<<hwnd<<":pid:"<<dwPID<<endl;//debug
PostMessage(hwnd,WM_KEYDOWN,'A',1); //send
}
} while (hwnd != 0);
return hwnd; //Ignore that
}
int main()
{
SendIt(2680); //notepad ID
return 0;
}
and notepad should write A
to it but nothing happens.
I tried WM_DESTROY
message on it and it's working but WM_KEYDOWN
is not working.
I have also done GetLastError()
and it prints error 2 ERROR_FILE_NOT_FOUND
.
Why is this not working and is it possible to fix it?
PostThreadMessage should be used.
hThread = GetWindowThreadProcessId(hwnd,&dwPID);
if (dwPID == dwProcessID && hThread!= NULL ) {
PostThreadMessage( hThread, WM_KEYDOWN,'A',1);
}
Two process must be created by same user. Otherwise, the function fails and returns ERROR_INVALID_THREAD_ID.
If the other process is active window which is capturing keyboard input, SendInput or keybd_event also can be used to send keystroke event.
I got a notepad which has a PID: 2860
Couldn't help noticing that you are saying 2860 and calling 2680
SendIt(2680); //notepad ID
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