Question

我尝试使用C ++创建一个后台实用程序，它可以作为日历提醒。该程序编译并运行没有任何障碍，但它不会发出警报，当它应该...时，这是代码：

#include<Windows.h>
#include<fstream>
#include<conio.h>
#include<string>
#include<ctime>

char Caption[] = "AshTech EventSentinel";

struct EventFormat
{
    char *notes; // Notes for the event
    int repeat; // Repeat flag (0-No, 1-Daily, 2-Weekly, 3-Monthly, 4-Yearly)
    int day; // Day of week  (0-Sunday, 1-Monday,..., 6-Saturday)
    int hour; // Hour of day (0-23 hours)
    int min; // Minute of hour (0-59 minutes)
    int date; // Date of month (1-31 days)
    int mon; // Month of year (0-January, 1-February,..., 11-December)
    int year; // Year of event
};

void Alert(char*);

int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR     lpCmdLine,
int       nCmdShow)
{
    char *filepath = "C:\\Windows\\EventSentinel_db.esdb";
    ifstream db_in(filepath);

    // If file exists, enter program.
    if(db_in)
    {
        int RecordNum, i;
        string FileRecord;
        i = RecordNum = 0;

        // Calculate number of lines in the file...
        while(getline(db_in, FileRecord))
        if (!FileRecord.empty())
            RecordNum++;

        EventFormat *Event;
        time_t     rawtime;
        struct tm* timeinfo;
        Event = new EventFormat[RecordNum];

        /********* EDITED ********/

        // Initializes all objects created to -1
        for(i=0;i<RecordNum;i++)
        {
            Event[i].date =
            Event[i].day =
            Event[i].hour =
            Event[i].min =
            Event[i].mon =
            Event[i].repeat =
            Event[i].year = -1;
        }
        db_in.seekg(0); // Reposition get pointer at the 0th byte...            
        /*************************/

        // Load struct array.
        while (!db_in.eof())
        {

            // EXCEPTION THROWN IN THIS STATEMENT BELOW...
            db_in.getline(Event[i].notes,','); // Assign input to Event[i].notes until ',' is encountered.

            db_in >> Event[i].repeat;
            switch (Event[i].repeat)
            {
                case 0: // No repeat - single instance.
                {
                    db_in >> Event[i].date;
                    db_in >> Event[i].mon;
                    db_in >> Event[i].year;
                    db_in >> Event[i].hour;
                    db_in >> Event[i].min;
                }break;
                case 1: // Repeat daily
                {
                    db_in >> Event[i].hour;
                    db_in >> Event[i].min;
                }break;             
                case 2: // Repeat weekly
                {
                    db_in >> Event[i].day;
                    db_in >> Event[i].hour;
                    db_in >> Event[i].min;
                }break;             
                case 3: // Repeat monthly
                {
                    db_in >> Event[i].date;
                    db_in >> Event[i].hour;
                    db_in >> Event[i].min;
                }break;             
                case 4: // Repeat yearly
                {
                    db_in >> Event[i].mon;
                    db_in >> Event[i].date;
                    db_in >> Event[i].hour;
                    db_in >> Event[i].min;
                }
            }
        }

        // Close file.
        db_in.close();

        // Main Loop.
        while (1)
        {
            time(&rawtime);
            timeinfo = localtime(&rawtime);
            for (i = 0; i < RecordNum; i++)
            {
                switch (Event[i].repeat)
                {
                    // No Repeat
                    case 0:
                    {
                        if (
                            timeinfo->tm_year == Event[i].year&&
                            timeinfo->tm_mon == Event[i].mon&&
                            timeinfo->tm_mday == Event[i].date&&
                            timeinfo->tm_hour == Event[i].hour&&
                            timeinfo->tm_min == Event[i].min
                            )
                            Alert(Event[i].notes);
                    }break;
                    // Repeat Daily
                    case 1:
                    {
                        if (
                            timeinfo->tm_hour == Event[i].hour&&
                            timeinfo->tm_min == Event[i].min
                            )
                            Alert(Event[i].notes);
                    }break;
                    // Repeat Weekly
                    case 2:
                    {
                        if (
                            timeinfo->tm_wday == Event[i].day&&
                            timeinfo->tm_hour == Event[i].hour&&
                            timeinfo->tm_min == Event[i].min
                            )
                            Alert(Event[i].notes);
                    }break;
                    // Repeat Monthly
                    case 3:
                    {
                        if (
                            timeinfo->tm_wday == Event[i].date&&
                            timeinfo->tm_hour == Event[i].hour&&
                            timeinfo->tm_min == Event[i].min
                            )
                            Alert(Event[i].notes);
                    }break;
                    // Repeat Yearly
                    case 4:
                    {
                        if (
                            timeinfo->tm_mon == Event[i].mon&&
                            timeinfo->tm_wday == Event[i].date&&
                            timeinfo->tm_hour == Event[i].hour&&
                            timeinfo->tm_min == Event[i].min
                            )
                            Alert(Event[i].notes);
                    }break;
                }
            }
            Sleep(10000);
        }

        delete[] Event;
    }

    // If file doesn't exist, create new file, and exit program.
    else
    {
        ofstream db_new(filepath);
        db_new.close();
        MessageBox(
            NULL,
            "File did not exist. New file has been created. Please add some events to it, for EventSentinel to handle.",
            "EventSentinel - Error detected!",
            MB_ICONEXCLAMATION | MB_OK);
    }
    return 0;
}

void Alert(char* notes)
{
    strcat(notes, "\r\n\n\nPress <ESC> to stop...");
    int KeyPress = -1;
    MessageBox(NULL, notes, Caption, MB_ICONINFORMATION);
    while (KeyPress != VK_ESCAPE)
    {
        if (_kbhit())
            KeyPress = getch;
        Beep(4000, 100);
        Sleep(25);
        Beep(4000, 100);
        Sleep(25);
        Beep(4000, 100);
        Sleep(25);
        Beep(4000, 100);
        Sleep(525);
    }
}

以下是数据库文件的示例输入：TV Show,1 12 00 其中“电视节目”是提醒本身，1表示“每日”重复标志值，因此只需要小时（'12'）和分钟（'00'）。

有人可以在这里查明问题吗？所有更正，优化，建议和建设性批评都非常感激。非常感谢你！

Answer 1

    while(getline(db_in, FileRecord))
        if (!FileRecord.empty())
            RecordNum++;

    ...

    // Load struct array.
    while (!db_in.eof())

第一个循环读取整个文件，第二个循环不读任何内容。

您可能想要db_in.seekg(0)。

日历提醒后台实用程序无法正常工作

1 个答案: