Get Error 'hWndDlg' undeclared(first use this function)..

Question

BruenorBH 0 Light Poster

14 Years Ago

I am getting the above error when trying to compile..

main.cpp

#include <windows.h>
#include <string>
#include "resource.h"

#define GETITEM(item) GetDlgItem(hWndDlg, item)

static bool keeprunning = true;
static bool keeprunning1 = true;
static bool keeprunning2 = true;
static void run();
static void breakrun();
static void lunchrun();
static void end();
static void breakend();
static void lunchend();
static DWORD WINAPI ThreadTime(LPVOID lpParam);
static DWORD WINAPI ThreadBreak(LPVOID lpParam);
static DWORD WINAPI ThreadLunch(LPVOID lpParam);
static HANDLE hThread = NULL;

LPCTSTR Caption = "Time for Aux!"; // Set the Captoin for all Msg boxes

// Global Variables
char CurrentTime[15], MeetingTime[15], StartTime[15], Break1Start[15], 
     LunchStart[15], Break2Start[15], LeaveTime[15], LateBreak[15], Time[15],
     Tmp[0], FileString[120];

int Contains = 0;

LRESULT CALLBACK DlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
 switch(Msg)
 {
  case WM_INITDIALOG:
       // Initiate what loads when the application starts
       run(); // Start thread for showing current thread
       
       // Open Times.txt file and save to FileString
       HANDLE fh;
       DWORD dwRead;
       DWORD dwFileSize;
       fh = CreateFile("Times.txt", GENERIC_READ, FILE_SHARE_READ, NULL,
                        OPEN_EXISTING, 0, NULL);
       dwFileSize = GetFileSize(fh, NULL);
       ReadFile(fh, FileString, dwFileSize, &dwRead, NULL);
       CloseHandle(fh);
       
       //Split FileString into its respective strings
       strncpy(StartTime, FileString, 11);
       strncpy(Break1Start, FileString + 13, 11);
       strncpy(LunchStart, FileString + 26, 11);
       strncpy(Break2Start, FileString + 39, 11);
       strncpy(LeaveTime, FileString + 52, 11);
       strcpy(FileString, "");
       
       // Load the Windows with the saved string values
       SetWindowText(GetDlgItem(hWndDlg, IDC_MEETING_TIME), "");
       SetWindowText(GetDlgItem(hWndDlg, IDC_START_TIME), StartTime);
       SetWindowText(GetDlgItem(hWndDlg, IDC_BREAK1), Break1Start);
       SetWindowText(GetDlgItem(hWndDlg, IDC_LUNCH), LunchStart);
       SetWindowText(GetDlgItem(hWndDlg, IDC_BREAK2), Break2Start);
       SetWindowText(GetDlgItem(hWndDlg, IDC_LEAVE_TIME), LeaveTime);      
  return TRUE;
  
  case WM_COMMAND:
       switch(LOWORD(wParam))
       {
        case IDC_LATE_BREAK_BTN:
             Sleep(900000); // Start a 15 minute timer
             MessageBox(NULL, "Time to return from your late break.", Caption, 
                         MB_OK);
        return TRUE;
        
        case IDCANCEL:
             // Stop the Current Timer Thread
             end();
             
             // Save current user entered times to string values
             GetWindowText(GETITEM(IDC_START_TIME), StartTime, 15);
             GetWindowText(GETITEM(IDC_BREAK1), Break1Start, 15);
             GetWindowText(GETITEM(IDC_LUNCH), LunchStart, 15);             
             GetWindowText(GETITEM(IDC_BREAK2), Break2Start, 15);
             GetWindowText(GETITEM(IDC_LEAVE_TIME), LeaveTime, 15);
             
             // Merge user entered times into comma delimeted line
             if (strcmp(StartTime, Tmp) == 0)
             {
               strcpy(FileString, "          ");
             }
             else
             {
               strcpy(FileString, StartTime);
             }
             strcat(FileString, ", ");
             
             if (strcmp(Break1Start, Tmp) == 0)
             {
               strcat(FileString, "          ");
             }
             else
             {
               strcat(FileString, Break1Start);
             }
             strcat(FileString, ", ");
             
             if (strcmp(LunchStart, Tmp) == 0)
             {
               strcat(FileString, "          ");
             }
             else
             {
               strcat(FileString, LunchStart);
             }
             strcat(FileString, ", ");
             
             if (strcmp(Break2Start, Tmp) == 0)
             {
               strcat(FileString, "          ");
             }
             else
             {
               strcat(FileString, Break2Start);
             }
             strcat(FileString, ", ");
               
             if (strcmp(LeaveTime, Tmp) == 0)
             {
               strcat(FileString, "          ");
             }
             else
             {
               strcat(FileString, LeaveTime);
             }
             
             // Save the string values to a file
             HANDLE fh;
             DWORD dwWritten = 120;
             DWORD dwFileSize = strlen(FileString);
             fh = CreateFile("Times.txt", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
                              FILE_ATTRIBUTE_NORMAL, NULL);
             WriteFile(fh, FileString, dwFileSize, &dwWritten, NULL);
             CloseHandle(fh);

             // Terminates the window
             EndDialog(hWndDlg, 0); 
        return TRUE;
       }
  break;
  }
 return FALSE; 
}

// Current Time Thread
static void run()
{
 DWORD dummy;
 hThread = CreateThread(NULL, 0, ThreadTime, NULL, 0, &dummy);
}

static void end()
{
 keeprunning = false;
}

static DWORD WINAPI ThreadTime(LPVOID lpParam)
{
 while (keeprunning)
 {
  time_t rawtime;
  struct tm * timeinfo;
  time(&rawtime);
  timeinfo = localtime(&rawtime);
  strftime(CurrentTime,20,"%I:%M:%S %p", timeinfo);
  SetWindowText(GetDlgItem(hWndDlg, IDC_CURRENT_TIME), CurrentTime);
  Sleep(1000);
  GetWindowText(GetDlgItem(hWndDlg, IDC_MEETING_TIME), MeetingTime, 15);
  GetWindowText(GetDlgItem(hWndDlg, IDC_START_TIME), StartTime, 15);
  GetWindowText(GetDlgItem(hWndDlg, IDC_BREAK1), Break1Start, 15);
  GetWindowText(GetDlgItem(hWndDlg, IDC_LUNCH), LunchStart, 15);
  GetWindowText(GetDlgItem(hWndDlg, IDC_BREAK2), Break2Start, 15);
  GetWindowText(GetDlgItem(hWndDlg, IDC_LEAVE_TIME), LeaveTime, 15);
  if (strcmp(MeetingTime, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time for your Meeting.", Caption, MB_OK);
  }
  else if (strcmp(StartTime, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time to login and start your day.", Caption, MB_OK);
  }
  else if (strcmp(Break1Start, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time to start your first break.", Caption, MB_OK);
    breakrun();
  }
  else if (strcmp(LunchStart, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time to go eat your lunch.", Caption, MB_OK);
    lunchrun();
  }
  else if (strcmp(Break2Start, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time to start your last break.", Caption, MB_OK);
    breakrun();
  }
  else if (strcmp(LeaveTime, CurrentTime) == 0)
  {
    MessageBox(NULL, "Time to ACD and get ready to go home.", Caption, MB_OK);
  }
 }
 return 0;
}

// Break Thread
static void breakrun()
{
 DWORD dummy;
 hThread = CreateThread(NULL, 0, ThreadBreak, NULL, 0, &dummy);
}

static void breakend()
{
 keeprunning1 = false;
}

static DWORD WINAPI ThreadBreak(LPVOID lpParam)
{
 while(keeprunning1)
 {
  Sleep(900000);
  MessageBox(NULL, "Time to login from your break.", Caption, MB_OK);
  breakend();
 }
 return 0;
}

// Lunch Thread
static void lunchend()
{
  DWORD dummy;
  hThread = CreateThread(NULL, 0, ThreadLunch, NULL, 0, &dummy);
}

static void lunchend()
{
 keeprunning2 = false;
}

static DWORD WINAPI ThreadLunch(LPVOID lpParam)
{
 while(keeprunning2)
 {
  Sleep(1800000);
  MessageBox(NULL, "Time to return from lunch.", Caption, MB_OK);
  lunchend();
 }
 return 0;
}

int APIENTRY WinMain (HINSTANCE hInst, HINSTANCE unused, LPSTR cmdLine, int cmdShow)
{
 DialogBox(hInst, MAKEINTRESOURCE(IDD_CONTROLS_DLG), 0, (DLGPROC)(DlgProc));
 return 0;
}

GUI.rc

#include "resource.h"
#include <afxres.h>

IDD_CONTROLS_DLG DIALOG DISCARDABLE  0, 0, 132, 180
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "HSBC Break Clock"
FONT 8, "MS Sans Serif"
MENU IDR_MAIN_MENU
BEGIN
    LTEXT           "Current Time is: ",-1,10,10,55,12
    LTEXT           "Meeting Time: ",-1,10,30,45,12
    LTEXT           "Start Time: ",-1,10,50,45,12
    LTEXT           "Break 1 Start: ",-1,10,70,45,12
    LTEXT           "Lunch Start: ",-1,10,90,45,12
    LTEXT           "Break 2 Start: ",-1,10,110,45,12
    LTEXT           "End Time: ",-1,10,130,45,12
    EDITTEXT        IDC_CURRENT_TIME,80,10,45,12, ES_AUTOHSCROLL
    EDITTEXT        IDC_MEETING_TIME,80,30,45,12,ES_RIGHT | ES_AUTOHSCROLL
    EDITTEXT        IDC_START_TIME,80,50,45,12,ES_RIGHT | ES_AUTOHSCROLL
    EDITTEXT        IDC_BREAK1,80,70,45,12,ES_RIGHT | ES_AUTOHSCROLL
    EDITTEXT        IDC_LUNCH,80,90,45,12,ES_RIGHT | ES_AUTOHSCROLL
    EDITTEXT        IDC_BREAK2,80,110,45,12,ES_RIGHT | ES_AUTOHSCROLL
    EDITTEXT        IDC_LEAVE_TIME,80,130,45,12,ES_RIGHT | ES_AUTOHSCROLL
    PUSHBUTTON      "Late Break",IDC_LATE_BREAK_BTN,20,150,40,18
    PUSHBUTTON      "Quit",IDCANCEL,70,150,40,18
END

IDR_MAIN_MENU MENU 
BEGIN
    POPUP "&File"
    BEGIN
        MENUITEM "Se&lect a Sound",             IDM_FILE_SOUND
        MENUITEM "E&xit",                       IDM_FILE_EXIT
    END
    POPUP "&Help"
    BEGIN
        MENUITEM "&About...\tF1",               IDM_HELP_ABOUT
    END
END

resource.h

#define IDD_CONTROLS_DLG                101
#define IDR_MAIN_MENU                   102
#define IDR_POPUP                       103
#define IDC_CURRENT_TIME                1002
#define IDC_MEETING_TIME                1003
#define IDC_START_TIME                  1004
#define IDC_BREAK1                      1005
#define IDC_LUNCH                       1006
#define IDC_BREAK2                      1007
#define IDC_LEAVE_TIME                  1008
#define IDC_LATE_BREAK_BTN              1009
#define IDM_FILE_SOUND                  2001
#define IDM_FILE_EXIT                   2002
#define IDM_HELP_ABOUT                  2003

c

3 Contributors
5 Replies
243 Views
2 Days Discussion Span
Latest Post 14 Years Ago Latest Post by BruenorBH

All 5 Replies

Ancient Dragon 5,243 Achieved Level 70

14 Years Ago

what line number does that error occur on ?

nucleon 114 Posting Pro in Training

14 Years Ago

ThreadTime does not have access to hWndDlg. You need to either make it global (DlgProc would set the global var in WM_INITDIALOG)or pass it as a parameter to ThreadTime.

Reply to this topic

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.

BruenorBH 0 Light Poster · Answer 1 · 2009-04-26T00:34:54+00:00

ThreadTime does not have access to hWndDlg. You need to either make it global (DlgProc would set the global var in WM_INITDIALOG)or pass it as a parameter to ThreadTime.

How would I set it as a Global variable or pass it as a parameter?

nucleon 114 Posting Pro in Training · Answer 2 · 2009-04-26T20:15:14+00:00

> How would I set it as a Global variable

This question suggests that you may not be ready for WinAPI programming. You should master the programming language with console programs.

To make it global: First put HWND gHWndDlg; at the top of the program (say, just before the definition of keeprunning). Then under case WM_INITDIALOG: put the line gHWndDlg = hWndDlg; . Then in ThreadProc change all hWndDlg to gHWndDlg.

BruenorBH 0 Light Poster · Answer 3 · 2009-04-27T07:13:30+00:00

OK.. I understand most of it.. I really don't learn unless I do it. I was putting something similar at the top but not declaring it in WM_INITDIALOG:. This is my second Win32 API program so it is a learning experience.. Thank you again Nucleon for the help..

Get Error 'hWndDlg' undeclared(first use this function)..

Recommended Answers Collapse Answers

All 5 Replies

Recommended Answers