unresolved external symbol

RIVOPICO

Hi i need help with these type of errors:
tecladoyraton.obj:-1: error: LNK2019: unresolved external symbol __imp__GetAsyncKeyState@4 referenced in function "short __cdecl comprobarTeclas(void)" (?comprobarTeclas@@YAFXZ)

Code:

#include "../headers/tecladoyratonwin.h"
#include <windows.h>

void enviarTecla(int tecla)
{
switch (tecla)
{
case Qt::Key_Return:
tecla = VK_RETURN;
break;
case Qt::Key_Backspace:
tecla = VK_BACK;
break;
case Qt::Key_Escape:
tecla = VK_ESCAPE;
break;
case Qt::Key_Shift:
tecla = VK_SHIFT;
break;
case Qt::Key_CapsLock:
tecla = VK_CAPITAL;
break;
}
keybd_event(tecla, 0, 0, 0);
keybd_event(tecla, 0, KEYEVENTF_KEYUP, 0);
}

void hacerClickDerechoP()
{
mouse_event( MOUSEEVENTF_RIGHTDOWN, 0, 0, 0, 0 );
}

void hacerClickIzquierdoP()
{
mouse_event( MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0 );
}
void hacerClickDerechoS()
{
mouse_event( MOUSEEVENTF_RIGHTUP, 0, 0, 0, 0 );
}

void hacerClickIzquierdoS()
{
mouse_event( MOUSEEVENTF_LEFTUP, 0, 0, 0, 0 );
}
short comprobarTeclas()
{
short i = 0;
for(i = 0; i < 255; i++){
if(GetAsyncKeyState(i) == -32767)
return i;
}
return 0;
}

Code of header:

#ifndef TECLADOYRATONWIN_H
#define TECLADOYRATONWIN_H
#include <Qt>

void enviarTecla(int tecla);
void hacerClickDerechoP();
void hacerClickIzquierdoP();
void hacerClickDerechoS();
void hacerClickIzquierdoS();
short comprobarTeclas();

[Moved to C++ Gurus ~kshegunov]

SGaist

Hi,

You are not linking to the user32 library.

RIVOPICO

hi i included this library with this way: LIBS += -luser32 but still i get other error very similar MSVCRT.lib(crtexe.obj):-1: error: LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup How i could include this library. Thanks in advance. The user library was solved. Only need this MSVCRT.lib

kshegunov

@RIVOPICO said in unresolved external symbol:

LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup

You need to have a main() function[1] in your application.

[1]: http://en.cppreference.com/w/cpp/language/main_function

SGaist

What exactly are you trying to develop ?

Qt already provides keyboard and mouse handling.

RIVOPICO

but i included main in this code:

#include <QApplication>
#include "mainwindow.h"
#include <Windows.h>
#ifndef Q_WS_X11
#include <QtPlugin>
#endif

#ifdef _MSC_VER
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    int argc = 0;
    char *argv[1];
#else
int main(int argc, char *argv[])
{
#endif
    QApplication a(argc, argv);
    MainWindow w;
    return a.exec();
}

Maybe i need to change mi main ??

kshegunov

@RIVOPICO said in unresolved external symbol:

Maybe i need to change mi main ??

No, you need to not use the WinAPI. Here I've given you the most basic of programs and there's no WinMain and there's no #ifdef, because they aren't needed nor at all useful in this case.

RIVOPICO

look this:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644990(v=vs.85).aspx
i am trying to record my keyboard and mouse

SGaist

Please stop posting the same questions several times.

This one ends up being exactly the same as this thread.

Closing this one.