程序中如何打印日志？(一)

       断点调试和打印日志各有优点，下面我们来简要说说如何在程序中打印日志，在BCB6.0中实现。

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop
#include <wtypes.h>
#include <stdio.h>
#include <fstream>
#include <string>
using namespace std;


#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    SYSTEMTIME stCurTime = {0};
    GetLocalTime(&stCurTime);
    char szTime[128] = {0};
    sprintf(szTime, "%d-%d-%d %d:%d:%d", stCurTime.wYear, stCurTime.wMonth, stCurTime.wDay, stCurTime.wHour, stCurTime.wMinute, stCurTime.wSecond);

    char szLocation[1024] = {0};
    sprintf(szLocation, "Function--->%s, Line: %d, File: %s", __FUNC__, __LINE__, __FILE__);

    char buf[2048] = {0};
    sprintf(buf, "%s %s", szTime, szLocation);
    ofstream outfile("log.txt", ios::app);
    outfile << buf << endl;
}
//---------------------------------------------------------------------------

      结果，log.txt中为：

2013-11-9 10:42:57 Function--->TForm1::Button1Click, Line: 32, File: C:\Documents and Settings\Administrator\hLآ\bcbTest\Unit1.cpp
2013-11-9 10:42:59 Function--->TForm1::Button1Click, Line: 32, File: C:\Documents and Settings\Administrator\hLآ\bcbTest\Unit1.cpp
2013-11-9 10:43:0 Function--->TForm1::Button1Click, Line: 32, File: C:\Documents and Settings\Administrator\hLآ\bcbTest\Unit1.cpp

      实际上，上述只是打印了基本的信息，后续博文中会介绍如何打印其它需要打印的信息。