Hi all,
I have this code here and I like to save all the messages into 1 text file name contimer.txt. I've tried to do

FILE *output
    fopen(output,"comtimer.txt", "ww");

right before the function Timer 1 and change every "printf" function into fprint_s(f, "Message", variables) but it does not help. Could I have some pointers? Thank you.

This is my full code:

// ConTimer.cpp
    // Username: lduong
    // Name: Luan Duong
    // File: ConTimer.cpp
    // Setup and run timers from a Windows Console.
    //
     
    #include "stdafx.h"
     
    #define IDT_TIMER1 1
    #define IDT_TIMER2 2
    #define IDT_TIMER3 3
    #define IDT_TIMER4 4
     
    double t1;
    int t2;
    int t3;
    int t4;
    double t;
     
    //////////////////////////////////////////////////////////////////////////////////
    /// Timer 1
    VOID CALLBACK Timer1(HWND hWnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
    {
    t = t1/10;
    t1++;
    printf("At time %f: Timer 1: %f, Timer 2: %d, Timer 3: %d, Timer 4: %d \n",t,t1,t2,t3,t4);
    }
     
    //////////////////////////////////////////////////////////////////////////////////
    /// Timer 2
    VOID CALLBACK Timer2(HWND hWnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
    {
    t = t1/10;
    t2++;
    printf("At time %f: Timer 2 now at %d cycles\n",t,t2);
    }
     
    //////////////////////////////////////////////////////////////////////////////////
    /// Timer 3
    VOID CALLBACK Timer3(HWND hWnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
    {
    t = t1/10;
    t3++;
    printf("At time %f: Timer 3 now at %d cycles\n",t,t3);
    }
    VOID CALLBACK Timer4(HWND hWnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
    {
    t = t1/10;
    t4++;
    printf("At time %f: Timer 4 now at %d cycles\n",t,t4);
    }
     
    //////////////////////////////////////////////////////////////////////////////////
    /// Main program
    int _tmain(int argc, _TCHAR* argv[])
    {
    MSG msg; // Windows message structure
    HWND hWnd;
    UINT_PTR timer_1;
    UINT_PTR timer_2;
    UINT_PTR timer_3;
    UINT_PTR timer_4;
     
    hWnd = NULL;
     
    // Setup the Timers.
     
    if (!(timer_1 = SetTimer(hWnd,
    IDT_TIMER1, // Real time data collection timer
    1000/10, // 2 Hertz interval
    (TIMERPROC) Timer1))) return -1;
     
    if (!(timer_2 = SetTimer(hWnd,
    IDT_TIMER2, // Real time data collection timer
    1000/5, // 2 second interval
    (TIMERPROC) Timer2))) return -2;
     
    if (!(timer_3 = SetTimer(hWnd,
    IDT_TIMER3, // Real time data collection timer
    1000/2, // 3 second interval
    (TIMERPROC) Timer3))) return -3;
    if (!(timer_4 = SetTimer(hWnd,
    IDT_TIMER4, // Real time data collection timer
    1000*2, // 3 second interval
    (TIMERPROC) Timer4))) return -4;
     
    t1 = 0;
    t2 = 0;
    t3 = 0;
    t4 = 0;
    // Now wait for the timers to timeout.
    // In this loop, we ask Windows if it has any
    // "messages" for this process.
     
    while (GetMessage(&msg, // message structure
    hWnd, // handle to window to receive the message
    0, // lowest message to examine
    0)) // highest message to examine
    { // A message has been received.
    // Dispatche the message.
    DispatchMessage(&msg);
    if (t>30) break;
    }
    // Stop the timers.
    KillTimer(hWnd, timer_1);
    KillTimer(hWnd, timer_2);
    KillTimer(hWnd, timer_3);
    KillTimer(hWnd, timer_4);
    return 0;
    }

Wrong format. Use:

filePointer = fopen("filename", "w");

Your file mode letter can be "r", "w", "a" "rt", "wt","rb" or "wb". The one's with a b are for binary mode, t is for text (and your system may have a default set by a variable option for your system). You can also use + between the letters, etc.

You should check your filePointer to be sure it's not NULL after the open line of code. It's common to have a filename be just a letter off, etc. Filenames are case sensitive, btw.

Wrong format. Use:

filePointer = fopen("filename", "w");

Your file mode letter can be "r", "w", "a" "rt", "wt","rb" or "wb". The one's with a b are for binary mode, t is for text (and your system may have a default set by a variable option for your system). You can also use + between the letters, etc.

You should check your filePointer to be sure it's not NULL after the open line of code. It's common to have a filename be just a letter off, etc. Filenames are case sensitive, btw.

thank you Adak. I could solve my problems using your help. Really appreciate it.

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