Keyboard hook weird problems.

Levia · #1 22-Feb-2006, 12:04

Im creating a hook to catch the text from users input when pressed F8, and it gets sent to a mirc channel window's edit box as soon as you press F7.But there are two weird problems

First one is that it doesnt work on background.F8 works on background, but the code in the hook doesnt work at background..Whats wrong?

Second, when I press F8 then type something then press F7, everything goes fine, but when I want to do it another time, without restarting, I get this error message sound as soon as I press F7, but nothing happens.I checked, and it did write the file, also checked if it executed the send messages, and it did.Whats wrong?

Pasting the whole code here.Including headers.
/\DLL
-=============DLLMAIN.CPP

CPP / C++ / C Code:

#include <windows.h> 
#include <fstream>
#include "dll.h"	
using namespace std;

ofstream KeyboardInput;	
HHOOK hHook;
HINSTANCE ghDLLInst=0;


BOOL WINAPI DllMain(HANDLE hModule, DWORD dwFunction, LPVOID lpNot)
{ 
    ghDLLInst=(HINSTANCE)hModule;
    return TRUE; 
} 

LRESULT CALLBACK KeyboardHook(int nCode, WPARAM wParam, LPARAM lParam) 
{
	KeyboardInput.open("text.txt", ofstream::app);
	if ((lParam < 1) && (nCode >= 0))	
	{
		if(wParam == VK_CONTROL || wParam == VK_ESCAPE)
		{
			return 0;
		}
		else
		{
			BYTE KeyboardState[256];
			GetKeyboardState(KeyboardState);
			WORD CharValue;
		
			if(ToAscii(wParam,0,KeyboardState,&CharValue,0) > 0)
			{
				KeyboardInput << (char)CharValue;
				KeyboardInput.close();
				return 1;
			}
		}
	}  
	KeyboardInput.close();
    return (int)CallNextHookEx(hHook, nCode, wParam, lParam); 
} 

__declspec(dllexport)int InstallHook(BOOL bCode)
{ 
    if(bCode) 
    { 
        hHook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD, (HOOKPROC)KeyboardHook,
                        ghDLLInst, GetCurrentThreadId());
        if(!hHook) {
            return 0;    
        } else {
            return 1;
        }
    } 
    else 
    { 
        return UnhookWindowsHookEx(hHook);
    } 
}

-===============DLL.H

CPP / C++ / C Code:

#ifndef dll_H
#define dll_H

__declspec(dllexport)int InstallHook(BOOL bCode);		// __declspec(dllexport) means that this function must be exported to a dll

#endif

/\Program
-================MAIN.CPP

CPP / C++ / C Code:

#include <string>
#include <iostream>
#include <fstream>
#include <windows.h>
#include "mainh.h"


using namespace std;

HINSTANCE hThisInstance;
HWND hwnd;
ifstream fin;
ofstream ofin;

int SendMessage(void);

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT paintStruct;
    HDC hDC;
    char text1[ ] = "Program will activate when F8 is pressed.";
    switch (message)
    {

        case WM_CREATE:
            if (RegisterHotKey(hwnd, VK_F8, 0, VK_F8) == 0) {
                int err = GetLastError();
                MessageBox(hwnd, "Failed", "Error", MB_OK);
                ofin.open("error.txt");
                ofin << err;
                ofin.close();
            }
            if (RegisterHotKey(hwnd, VK_F7, 0, VK_F7) == 0) {
                int err = GetLastError();
                MessageBox(hwnd, "Failed", "Error", MB_OK);
                ofin.open("error.txt");
                ofin << err;
                ofin.close();
            }
            CreateWindowEx(0,                                      //more or 'extended' styles
                       TEXT("BUTTON"),                         //'class' of control to create
                       TEXT("Main"),                      //the control caption
                       WS_CHILD|WS_VISIBLE|BS_GROUPBOX,        //control style: how it looks
                       2,                                    //control position: left
                       0,                                      //control position: top
                       290,                                    //control width
                       50,                                     //control height
                       hwnd,                                   //parent window handle
                       NULL,                                   //control's ID
                       hThisInstance,                                //application instance
                       NULL
            );
            break;
        case WM_COMMAND:           
            break;
        case WM_HOTKEY:
            if (wParam == VK_F8) {
                ofin.open("text.txt");
                if (ofin.is_open()) {
                    ofin << "";
                    ofin.close();
                }
                InstallHook(TRUE);
            }
            if (wParam == VK_F7) {
                if (SendMessage() != 1) {
                    MessageBox(hwnd, "Failed to send", "Error", MB_OK);
                    int err = GetLastError();
                    ofin.open("Error.log");
                    ofin << err;
                    ofin.close();
                }
                InstallHook(FALSE);
            }
            break;
        case WM_DESTROY:
            UnregisterHotKey(hwnd, VK_F8);
            UnregisterHotKey(hwnd, VK_F7);

            InstallHook(FALSE);
            PostQuitMessage (0);
            break;
        case WM_CLOSE:
            break;
        case WM_PAINT:  
			hDC = BeginPaint(hwnd,&paintStruct);
            SetBkMode(hDC, TRANSPARENT);
			SetTextColor(hDC, COLORREF(0x00000000));
            TextOut(hDC,6,15,text1,sizeof(text1)-1);
			EndPaint(hwnd, &paintStruct);
			return 0;
			break;

        default:
            break;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}


char szClassName[ ] = "MMChat";

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{             
    MSG messages;            
    WNDCLASSEX wincl;        

    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      
    wincl.style = CS_DBLCLKS;                 
    wincl.cbSize = sizeof (WNDCLASSEX);

    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 
    wincl.cbClsExtra = 0;                      
    wincl.cbWndExtra = 0;                      
    wincl.hbrBackground = HBRUSH(COLOR_3DFACE + 1); 
    
    if (!RegisterClassEx (&wincl))
        return 0;

    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "MMChat",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           300,                 /* The programs width */
           85,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL
           );

    ShowWindow (hwnd, nFunsterStil);

    while (GetMessage (&messages, NULL, 0, 0))
    {

        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}

/* Functions */
int SendMessage (void) {
    string line;        
    fin.open("text.txt");
    if (fin.is_open()) {
        getline (fin,line);
    }
    HWND mainHandle = FindWindow("mIRC", NULL);
    HWND serverHandle = FindWindowEx(mainHandle, NULL, "MDIClient", NULL);
    HWND chanHandle = FindWindowEx(serverHandle, NULL, "mIRC_Channel" ,NULL);
    HWND editHandle = FindWindowEx(chanHandle, NULL, "Edit", NULL);
    if (serverHandle == 0) {
        MessageBox(hwnd, "Unable to retrieve handle of MDIClient", "Error", MB_OK);
        return 0;
    } else {
        if (chanHandle == 0) {
            MessageBox(hwnd, "Unable to retrieve handle of mIRC_Channel", "Error", MB_OK);
            return 0;
        } else {
            if (editHandle == 0) {
                MessageBox(hwnd, "Unable to retrieve handle of Editbox", "Error", MB_OK);
                return 0;
            } else {
                SendMessage(editHandle, WM_SETTEXT, 0, (LPARAM)line.c_str());
                SendMessage(editHandle, WM_IME_KEYDOWN, VK_RETURN, 0);
                return 1;
            }
        }
        if (fin.is_open()) {
            fin.close();
        }
    }
    return 0;
}

-===============mainh.h

CPP / C++ / C Code:

#ifndef MAINH_H
#define MAINH_H

// InstallHook needs to be imported from a dll.
__declspec(dllimport) int InstallHook(BOOL bCode);

#endif

Sorry that I pasted this much code, but I feel like it can be in either the DLL or the program.

TurboPT · #2 23-Feb-2006, 20:57

Not sure about all the 'hooking', but could GetAsyncKeyState() possibly work for you? I'll have to post more later, for I can't get into specifics right now.

Levia · #3 25-Feb-2006, 12:53

GetAsyncKeyState is only for 1 key, not for the all of them at the same time??

TurboPT · #4 25-Feb-2006, 19:17

I guess I may not be sure about what you are trying to accomplish, but I assumed you were looking for only the F7 & F8 keys?

I was thinking something along these lines:

CPP / C++ / C Code:

      
      if (GetAsyncKeyState(VK_F7) < 0)
      {
           // handle the F7 key press.
      }
      else if (GetAsyncKeyState(VK_F8) < 0)
      {
          // handle the F8 key press.
      }

Levia · #5 26-Feb-2006, 00:31

No not really.The F8 and F7 keys work fine, but its about the 'normal' keys like 'a' and so on, I need to track those.Thats done in the DLL with GetKeyboardState() which copies all button values to a variable.THAT one doesnt work on background.

ubergeek · #6 27-Feb-2006, 15:40

I think you're trying to capture the string the user types after F7 and before F8, right? Not just one character? If I'm right, GetKeyboardState() is not what you want. That just takes a "snapshot" of the keyboard. You probably need to create a window with a text box to capture the input.

By the way, defining a function SendMessage(), which is the same name as the very common Win32 function, is probably a bad idea (while C++ overloading will sort it out, the same name in your code will get confusing)

Levia · #7 28-Feb-2006, 04:24

ubergeek: ..It is the other way around

But that doesnt matter.F8 -> "Type something you like" -> F7
But yes, I wanna the capture the string after F8 and before F7.And I want it to work on background

That is the whole problem.The F8 and F7 do work on background, only the capturing dont.

I dont think the textbox will catch the keys on background?
But using such a textbox would be more efficient, as i dont have to use the file writing anylonger, but it must work on background.

ubergeek · #8 28-Feb-2006, 15:08

why not do this (pseudocode):

Code:

OnPressF8
    SetFlag(already pressed F8)
    CreateWindow(small, middle of screen)
    CreateEditBox(in above window)
End_OnPressF8
OnPressF7
    IfNot (already pressed F8) Break
    GetText(from edit box)
    SetText(gotten in above statement, to mirc window)
    DestroyWindow(the one created in OnPressF8)
    ClearFlag(already pressed F8)
End_OnPressF7

I hope my psuedocode is comprehensible. By the way, you could eliminate the flag by simply checking whether your window exists.

My way, the program site in the background listening for F8, and then it comes to the foreground to capture text (this way the user can see what they are typing, as well) and then goes away again when F7 is pressed

Levia · #9 01-Mar-2006, 03:28

Its a very good idea.I perfectly understand what you are trying to do, which is very smart.Ill try it today, and paste the code asap, so you can see what happened to it.

Ill try it, but im not sure whether the game will alt-tab after showing the window.

Levia · #10 01-Mar-2006, 06:56

Made the program, but as I already thought, showing it in the game is a problem

CPP / C++ / C Code:

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


using namespace std;

HINSTANCE hThisInstance;
HWND hwnd;
HWND CWindow;
HWND EBox;
ifstream fin;
ofstream ofin;

int SendMessage(void);
int CreateWnd(void);

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT paintStruct;
    HDC hDC;
    int pressed = 0;
    char text1[ ] = "Program will activate when F8 is pressed.";
    switch (message)
    {

        case WM_CREATE:
            if (RegisterHotKey(hwnd, VK_F8, 0, VK_F8) == 0) {
                int err = GetLastError();
                MessageBox(hwnd, "Failed", "Error", MB_OK);
                ofin.open("error.txt");
                ofin << err;
                ofin.close();
            }
            if (RegisterHotKey(hwnd, VK_F7, 0, VK_F7) == 0) {
                int err = GetLastError();
                MessageBox(hwnd, "Failed", "Error", MB_OK);
                ofin.open("error.txt");
                ofin << err;
                ofin.close();
            }
            CreateWindowEx(0,                                      //more or 'extended' styles
                       TEXT("BUTTON"),                         //'class' of control to create
                       TEXT("Main"),                      //the control caption
                       WS_CHILD|WS_VISIBLE|BS_GROUPBOX,        //control style: how it looks
                       2,                                    //control position: left
                       0,                                      //control position: top
                       290,                                    //control width
                       50,                                     //control height
                       hwnd,                                   //parent window handle
                       NULL,                                   //control's ID
                       hThisInstance,                                //application instance
                       NULL
            );
            break;
        case WM_COMMAND:           
            break;
        case WM_HOTKEY:
            if (wParam == VK_F8) {
                pressed = 1;
                CreateWnd();
            }
            if ((wParam == VK_F7) && (pressed == 1)) {
                
            }
            break;
        case WM_DESTROY:
            UnregisterHotKey(hwnd, VK_F8);
            UnregisterHotKey(hwnd, VK_F7);

            PostQuitMessage (0);
            break;
        case WM_CLOSE:
            break;
        case WM_PAINT:  
			hDC = BeginPaint(hwnd,&paintStruct);
            SetBkMode(hDC, TRANSPARENT);
			SetTextColor(hDC, COLORREF(0x00000000));
            TextOut(hDC,6,15,text1,sizeof(text1)-1);
			EndPaint(hwnd, &paintStruct);
			return 0;
			break;

        default:
            break;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}


char szClassName[ ] = "MMChat";

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{             
    MSG messages;            
    WNDCLASSEX wincl;        

    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      
    wincl.style = CS_DBLCLKS;                 
    wincl.cbSize = sizeof (WNDCLASSEX);

    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 
    wincl.cbClsExtra = 0;                      
    wincl.cbWndExtra = 0;                      
    wincl.hbrBackground = HBRUSH(COLOR_3DFACE + 1); 
    
    if (!RegisterClassEx (&wincl))
        return 0;

    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "MMChat",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           300,                 /* The programs width */
           85,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL
           );

    ShowWindow (hwnd, nFunsterStil);

    while (GetMessage (&messages, NULL, 0, 0))
    {

        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}

/* Functions */
int SendMessage (void) {
    string line;        
    fin.open("text.txt");
    if (fin.is_open()) {
        getline (fin,line);
    }
    HWND mainHandle = FindWindow("mIRC", NULL);
    HWND serverHandle = FindWindowEx(mainHandle, NULL, "MDIClient", NULL);
    HWND chanHandle = FindWindowEx(serverHandle, NULL, "mIRC_Channel" ,NULL);
    HWND editHandle = FindWindowEx(chanHandle, NULL, "Edit", NULL);
    if (serverHandle == 0) {
        MessageBox(hwnd, "Unable to retrieve handle of MDIClient", "Error", MB_OK);
        return 0;
    } else {
        if (chanHandle == 0) {
            MessageBox(hwnd, "Unable to retrieve handle of mIRC_Channel", "Error", MB_OK);
            return 0;
        } else {
            if (editHandle == 0) {
                MessageBox(hwnd, "Unable to retrieve handle of Editbox", "Error", MB_OK);
                return 0;
            } else {
                SendMessage(editHandle, WM_SETTEXT, 0, (LPARAM)line.c_str());
                //SendMessage(editHandle, WM_IME_KEYDOWN, VK_RETURN, 0);
                return 1;
            }
        }
        if (fin.is_open()) {
            fin.close();
        }
    }
    return 0;
}

LRESULT CALLBACK ChatWindowProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT paintStruct;
    HDC hDC;
    switch (message)
    {
        case WM_CREATE:
            EBox = CreateWindowEx(
                       WS_EX_CLIENTEDGE,                      //more or 'extended' styles
                       TEXT("EDIT"),                          //'class' of control to create
                       0,    //the control caption
                       WS_CHILD|WS_VISIBLE|WS_BORDER|         //control style: how it looks
                       ES_MULTILINE,
                       0,                                    //control position: left
                       0,                                    //control position: top
                       240,                                   //control width
                       85,                                    //control height
                       hwnd,                                  //parent window handle
                       NULL,                                  //control's ID
                       hThisInstance,                               //application instance
                       NULL
            );
            if (!EBox) {
                int err = GetLastError();
                MessageBox(hwnd, "Failed", "Failed", MB_OK);
                ofin.open("errors.log");
                ofin << err;
                ofin.close();
            }
            SetWindowPos(EBox, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOMOVE);
            SetFocus(EBox);
            break;
        default:
            break;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}






int CreateWnd(void) {
    char WindowClassname[ ] = "Type";
    WNDCLASSEX wincl;        

    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = WindowClassname;
    wincl.lpfnWndProc = ChatWindowProc;      
    wincl.style = CS_DBLCLKS;                 
    wincl.cbSize = sizeof (WNDCLASSEX);

    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 
    wincl.cbClsExtra = 0;                      
    wincl.cbWndExtra = 0;                      
    wincl.hbrBackground = HBRUSH(COLOR_3DFACE + 1); 
    
    if (!RegisterClassEx (&wincl)) {
        return 0;
    }

    CWindow = CreateWindowEx(
        0,
        WindowClassname,
        "Type",
        WS_OVERLAPPEDWINDOW | WS_EX_TOPMOST,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        250,
        120,
        hwnd,
        NULL,
        hThisInstance,
        NULL
    );
    ShowWindow(CWindow,1);
    //SetForegroundWindow(CWindow);
    //BringWindowToTop(CWindow);
    if (!CWindow) {
        int err = GetLastError();
        MessageBox(hwnd, "Failed", "Failed", MB_OK);
        ofin.open("errors.log");
        ofin << err;
        ofin.close();
    }
}

Dont pay any attention to those file write stuff, there just to test, ill remove em later.

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Keyboard hook weird problems.

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Re: Keyboard hook weird problems.

Re: Keyboard hook weird problems.

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Re: Keyboard hook weird problems.

Re: Keyboard hook weird problems.

Re: Keyboard hook weird problems.