Forum posts for iexplore.exe

How to capture keystrokes of iexplore.exe only?

My goal is to capture keystrokes of the user when he is interacting with Internet Explorer (iexplore.exe).

This is my DLL code for a DLL called hook.dll.

#include <iostream>
#include <windows.h>

extern 'C' __declspec(dllexport)
LRESULT keyboardHook(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode >= 0) {
std::cout << 'nCode: ' << nCode << '; wParam: ' << wParam
<<' (' << char(wParam) << '); scan code: '
<< ((lParam & 0xFF0000) >> 16)
<< '; transition state: ' << ((lParam & 0x80000000) >> 31)
<< std::endl;
}
return CallNextHookEx(NULL, nCode, wParam, lParam);
}
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
std::cout << 'hinstDLL: ' << hinstDLL
<< '; fdwReason: ' << fdwReason
<< '; lpvReserved: ' << lpvReserved << std::endl;

return TRUE;
}


Here is the main program code for main.exe:

#include <iostream>
#include <windows.h>

int main(int argc, char **argv)
{
HMODULE dll = LoadLibrary('hook.dll');
if (dll == NULL) {
std::cerr << 'LoadLibrary error ' << GetLastError() << std::endl;
return 1;
}

HOOKPROC callback = (HOOKPROC) GetProcAddress(dll, 'keyboardHook');
if (callback == NULL) {
std::cerr << 'GetProcAddress error ' << GetLastError() << std::endl;
return 1;
}

HHOOK hook = SetWindowsHookEx(WH_KEYBOARD, callback, dll, NULL);
if (hook == NULL) {
std::cerr << 'SetWindowsHookEx error ' << GetLastError() << std::endl;
return 1;
}

MSG messages;
while (GetMessage (&messages, NULL, 0, 0))
{
TranslateMessage(&messages);
DispatchMessage(&messages);
}
UnhookWindowsHookEx(hook);
}


I compile this project with these commands:

vcvars32.bat
cl /LD hook.cc /link user32.lib
cl main.cc /link user32.lib


When I execute the program, and press the keys A, B and C, I see the following output.

C:>main
hinstDLL: 10000000; fdwReason: 1; lpvReserved: 00000000
nCode: 0; wParam: 65 (A); scan code: 30; transition state: 0
nCode: 0; wParam: 65 (A); scan code: 30; transition state: 1
nCode: 0; wParam: 66 (B); scan code: 48; transition state: 0
nCode: 0; wParam: 66 (B); scan code: 48; transition state: 1
nCode: 0; wParam: 67 (C); scan code: 46; transition state: 0
nCode: 0; wParam: 67 (C); scan code: 46; transition state: 1


This is all good so far, but this program captures keystrokes made anywhere on the desktop. But I want to capture only those keystrokes that are made on Internet Explorer. I believe I need to modify the SetWindowsHookEx(WH_KEYBOARD, callback, dll, NULL); call in main program and pass the thread ID of the Internet Explorer as the fourth argument to this call. Could you please help me to solve this problem?

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