HOw to make window active and get the threadid of it

[manugm_1987]

Hi everyone

I have an application which hooks to notepad and records the keyboard strokes, this works fine only when i have an notepad open before executing my application. Once the appl is running and then i open notepad my appl doesnt work. My ques is suppose i have first executed my appl and then starts my notepad, how can i hook to this notepad.

Second ques is suppose i have opened say some 5 notepads, and my appl is already running how can i record keystrokes of the active notepad. I mean, first i may work with notepad 5, then i minimize it or close it and starts working with 2 nd notepad so on .... How to capture keystrokes of the current active notepad.

The code is

#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#include "conio.h"
HINSTANCE hins;
HOOKPROC hkprc;
HHOOK hk;
HANDLE hnd;
FILE *fp;
char c;
int flag=0;
int i;
int _tmain(int argc, _TCHAR* argv[])
{
	//Sleep(1000);	
	HWND wndhnd;
	DWORD threadid;
	system("notepad.exe");
	wndhnd=FindWindow(NULL,_T("Untitled - Notepad"));
	threadid=GetWindowThreadProcessId(wndhnd,NULL);
	hins=LoadLibrary(TEXT("C:\\Documents and Settings\\manu\\My Documents\\Visual Studio 2008\\Projects\\globalkeyhook\\Debug\\globalkeyhook.dll"));
	hkprc=(HOOKPROC)GetProcAddress(hins,"KeyboardProc");
	hk=SetWindowsHookEx(WH_KEYBOARD,hkprc,hins,threadid);
				
	if(threadid==0)
	{
	        printf("Unhooked\n");
		UnhookWindowsHookEx(hk);
	}
	else 
	{
		printf("hooked to threadid-->%lu:",threadid);
				}

PLease help me ...i am newbie to system programming.....

[Ancient Dragon]

If you use CreateProcess() instead of system() to spawn Notepad.exe then CreateProcess() will give you the thread id.

Here is an example. The PROCESS_INFORMATION structure will contain the data you are looking for.

#include <Windows.h>
#include <iostream>
using std::cout;

int main()
{
    PROCESS_INFORMATION pinfo;
    STARTUPINFO sinfo;
    memset(&sinfo,0,sizeof(sinfo));
    sinfo.cb = sizeof(STARTUPINFO);

    if( CreateProcess(NULL,"Notepad.exe myfile.txt",NULL,NULL,
            FALSE,0,NULL,NULL,&sinfo,&pinfo) == 0)
    {
        cout << "Error calling Notepad\n";
        return 1;
    }
    return 0;
}