Here Goes My Code
// hook.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <windows.h>
#include <iostream>
using namespace std;
LRESULT CALLBACK GetMsgProc(int code, WPARAM wParam, LPARAM lParam);
int _tmain(int argc, _TCHAR* argv[]){
int __;
cout << "Hallo World" << endl;
SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc, 0, 0);
cin >> __;
return 0;
}
LRESULT CALLBACK GetMsgProc(int code, WPARAM wParam, LPARAM lParam){
cout << code << endl;
return 0;
}
I am trying to get WM_PAINT event... at the moment I am trying to trap all the events. Where I am Missing ?
Read the documentation please. It clearly states why your usage is incorrect especially with regard to the last two parameters. If you want to hook every thread you need to provide a module
http://msdn.microsoft.com/en-us/library/ms644990(v=vs.85).aspx
Related
I have a issue, where I need the GUI from QT Designer to give values to a separate program running from terminal where the values from the GUI are "printed" onto the terminal interface (Linux with GCC compiler)
I have researched pthreads, but their application examples are limited to In-Application uses. The code in my main file is as follows:
#include "main_window.h"
#include <QApplication>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
void *thr_func(void *thread_id)
{
int tid = thread_id;
pthread_mutex_lock(&lock_x);
cout << "thread" << tid << end1;
cout << xValue << end1;
cout << yValue << end1;
cout << zValue << end1;
pthread_mutex_unlock(&lock_x);
}
int main(int argc, char *argv[])
{
pthread_create(thread_1, NULL, thr_func, NULL)
while(true)
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
pthread_exit(NULL);
}
**Note that xValue, yValue, and zValue already stream to a textfile from the QT application. I am adapting the application for terminal running and control.
#include <iostream>
#include <thread>
#include <signal.h>
#include <unistd.h>
void handler(int sig){
std::cout << "handler" << std::endl;
}
void func() {
sleep(100);
perror("sleep err:");
}
int main(void) {
signal(SIGINT, handler);
std::thread t(func);
pthread_kill(t.native_handle(), SIGINT);
perror("kill err:");
t.join();
return 0;
}
If I put sleep() inside main function, and send a signal by pressing ctrl+c, sleep will be interrupted and return immediately with perror() saying it's interrupted.
But with the code above, the "handler" in handler function will be printed, but sleep will not return and the program keeps running. The output of this program is:
kill err:: Success
handler
And if I replace sleep() with recvfrom(), recvfrom() will not be interrupted even it's inside the main thread.
#include <vector>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <unistd.h>
void SigHandler(int sig){
std::cout << "handler" << std::endl;
}
int main(void) {
signal(SIGINT, SigHandler);
int bind_fd_;
if ((bind_fd_ = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
std::cout << "socket creation failed " << strerror(errno) << std::endl;
}
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(12345);
if (bind(bind_fd_, reinterpret_cast<const struct sockaddr *>(&servaddr),
sizeof(servaddr)) < 0) {
std::cout << "socket bind failed " << strerror(errno) << std::endl;
}
struct sockaddr_in cliaddr;
socklen_t cliaddr_len = sizeof(cliaddr);
std::vector<char> buffer(10*1024*1024,0);
std::cout << "Wait for new request"<< std::endl;
int n = 0;
while (n == 0) {
std::cout << "before recvfrom" << std::endl;
n = recvfrom(bind_fd_, buffer.data(), buffer.size(), 0,
reinterpret_cast<struct sockaddr *>(&cliaddr), &cliaddr_len);
// sleep(100);
perror("recvfrom err: ");
std::cout << "recv " << n << " bytes from " << cliaddr.sin_port<< std::endl;
}
}
I don't know what is wrong with my code, hoping your help, thanks
At the time you direct the signal to the thread, that thread has not yet proceeded far enough to block in sleep(). Chances are that it has not even been scheduled for the first time. Change the code to something like
std::thread t(func);
sleep(5); // give t enough time to arrive in sleep()
pthread_kill(t.native_handle(), SIGINT);
and you'll see what you expect.
Note that using signals in a multithreaded program is not usually a good idea because certain aspects are undefined/not-so-clearly defined.
Note also that it is not correct to use iostreams inside a signal handler. Signal handlers run in a context where pretty much nothing is safe to do, much like an interrupt service routine on bare metal. See here for a thorough explanation of that matter.
I am using code that runs on ARM (not Intel processor). Running c++11 code example (CODE A) from: http://www.cplusplus.com/reference/condition_variable/condition_variable/wait_for/ to test the wait_for() mechanism. This is not working right - looks like the wait_for() does not wait. In Intel works fine. After some research and using pthread library directly and setting MONOTONIC_CLOCK definition, solves the issue (CODE B).
(Running on ARM is not the issue)
My problem is :
How can I force the C++11 API wait_for() to work with MONOTONIC_CLOCK?
Actually I would like to stay with 'CODE A' but with the support or setting of MONOTONIC_CLOCK.
Thanks
CODE A
// condition_variable::wait_for example
#include <iostream> // std::cout
#include <thread> // std::thread
#include <chrono> // std::chrono::seconds
#include <mutex> // std::mutex, std::unique_lock
#include <condition_variable> // std::condition_variable, std::cv_status
std::condition_variable cv;
int value;
void read_value() {
std::cin >> value;
cv.notify_one();
}
int main ()
{
std::cout << "Please, enter an integer (I'll be printing dots): \n";
std::thread th (read_value);
std::mutex mtx;
std::unique_lock<std::mutex> lck(mtx);
while
(cv.wait_for(lck,std::chrono::seconds(1))==std::cv_status::timeout)
{
std::cout << '.' << std::endl;
}
std::cout << "You entered: " << value << '\n';
th.join();
return 0;
}
CODE B
#include <sys/time.h>
#include <unistd.h>
#include <iostream> // std::cout
#include <thread> // std::thread
#include <chrono> // std::chrono::seconds
#include <mutex> // std::mutex, std::unique_lock
#include <condition_variable> // std::condition_variable, std::cv_status
const size_t NUMTHREADS = 1;
pthread_mutex_t mutex;
pthread_cond_t cond;
int value;
bool done = false;
void* read_value( void* id )
{
const int myid = (long)id; // force the pointer to be a 64bit integer
std::cin >> value;
done = true;
printf( "[thread %d] done is now %d. Signalling cond.\n", myid, done
);
pthread_cond_signal( &cond );
}
int main ()
{
struct timeval now;
pthread_mutexattr_t Attr;
pthread_mutexattr_init(&Attr);
pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mutex, &Attr);
pthread_condattr_t CaAttr;
pthread_condattr_init(&CaAttr);
pthread_condattr_setclock(&CaAttr, CLOCK_MONOTONIC);
pthread_cond_init(&cond, &CaAttr);
std::cout << "Please, enter an integer:\n";
pthread_t threads[NUMTHREADS];
int t = 0;
pthread_create( &threads[t], NULL, read_value, (void*)(long)t );
struct timespec ts;
pthread_mutex_lock( &mutex );
int rt = 0;
while( !done )
{
clock_gettime(CLOCK_MONOTONIC, &ts);
ts.tv_sec += 1;
rt = pthread_cond_timedwait( & cond, & mutex, &ts );
std::cout << "..." << std::endl;
}
pthread_mutex_unlock( & mutex );
std::cout << "You entered: " << value << '\n';
return 0;
}
The documentation for std::condition_variable::wait_for says:
A steady clock is used to measure the duration.
std::chrono::steady_clock:
Class std::chrono::steady_clock represents a monotonic clock. The time points of this clock cannot decrease as physical time moves forward.
Unfortunately, this is gcc Bug 41861 (DR887) - (DR 887)(C++0x) does not use monotonic_clock that it uses system_clock instead of steady_clock for condition variables.
One solution is to use wait_until (be sure to read Notes section) function that allows to specify durations relative to a specific clock. E.g.:
cv.wait_until(lck, std::chrono::steady_clock::now() + std::chrono::seconds(1))
i have this Working example in C++ of a keyboard hook
#include <iostream>
#include <fstream>
#include <Windows.h>
#pragma comment(lib, "user32.lib")
HHOOK keyboardHook{ NULL };
LRESULT CALLBACK MyLowLevelKeyBoardProc(const int nCode, const WPARAM wParam, const LPARAM lParam)
{
KBDLLHOOKSTRUCT *kb = (KBDLLHOOKSTRUCT *)lParam;
switch (wParam)
{
case WM_KEYUP:
std::cout << "KeyUp event : " << kb->vkCode << std::endl;
break;
}
return CallNextHookEx(keyboardHook, nCode, wParam, lParam);
}
int main(int argc, char* argv[])
{
keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, MyLowLevelKeyBoardProc, NULL, 0);
if (keyboardHook == NULL) {
std::cout << "Keyboard hook failed!" << std::endl;
}
while (GetMessage(NULL, NULL, 0, 0));
return 0;
}
i want to this to read data from an usb rfid card reader that act like a keyboard .
the main problem is how to differentiate the keys that come from the reader and that come from the real keyboard .
i have tested the dwExtraInfo parameter of KBDLLHOOKSTRUCT but gave me 0 in both cases (keyboard/card reader)
any help/idea/suggestion is welcome
thanks .
I'm trying to send multiple notifications to a running thread from another thread (main thread) using std::condition_variable. Sending it once works however doing it the second or multiple times doesn't seem to work. This is what I did (without unnecessary details of the actual events):
#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <future>
bool keep_running=true;
bool condition_reached=false;
std::mutex cond_mtx;
std::condition_variable cond;
void thread_waiting_to_be_notified(){
while(keep_running){
std::unique_lock<std::mutex> lk(cond_mtx);
cond.wait(lk,[]()->bool{return condition_reached;});
std::cout << "got notitication" << std::endl;
condition_reached=false;
}
}
void some_event(){
/*some event happens here*/
}
void another_event(){
/*another event happens here*/
}
int main(){
std::thread thr(thread_waiting_to_be_notified);
some_event();//first event
std::cout << "some event happened" << std::endl;
condition_reached=true;
cond.notify_one();
another_event();//second event
std::cout << "another event happened" << std::endl;
condition_reached=true;
cond.notify_one();
keep_running=false;
thr.join();
return 0;
}
and the output I got
some event happened
another event happened
got notitication
However, I'd expect
some event happened
another event happened
got notitication
got notitication
Any advice would be appreciated.
Try inserting lk.unlock(); after
condition_reached=false;