程序中如何打印日志？(二)

       前面博文中的打印日志方法太复杂，能不能简单一点呢？我能！

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

#include 
#pragma hdrstop
#include 
#include 
#include 
#include 
using namespace std;


#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

void logFunc(char *function, int line, char *file, char *msg)
{
    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[2048] = {0};
    sprintf(szLocation, "%s ===> Function--->%s, Line: %d, File: %s", msg, function, line, file);

    char buf[2500] = {0};
    sprintf(buf, "%s %s", szTime, szLocation);
    ofstream outfile("log.txt", ios::app);
    outfile << buf << endl;
}


//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{

}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    logFunc(__FUNC__, __LINE__, __FILE__, "HELLO");
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)
{
    logFunc(__FUNC__, __LINE__, __FILE__, "WORLD");
}
//---------------------------------------------------------------------------

       上述程序逻辑和结果正确，但有个问题，两个函数中都需要写__FUNC__, __FILE__, __LINE__这些东西，你想啊，在整个工程中有多少函数啊，所以，要改：

 

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

#include 
#pragma hdrstop
#include 
#include 
#include 
#include 
using namespace std;


#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

void logFunc(char *msg)
{
    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[2048] = {0};
    sprintf(szLocation, "%s ===> Function--->%s, Line: %d, File: %s", msg, __FUNC__, __LINE__, __FILE__);

    char buf[2500] = {0};
    sprintf(buf, "%s %s", szTime, szLocation);
    ofstream outfile("log.txt", ios::app);
    outfile << buf << endl;
}


//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    logFunc("HELLO");
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)
{
    logFunc("WORLD");
}
//---------------------------------------------------------------------------

      上述程序逻辑上有问题，打印的不是所想要的信息，而是：

2013-11-9 11:9:44 HELLO ===> Function--->logFunc, Line: 26, File: C:\Documents and Settings\Administrator\hLآ\bcbTest\Unit1.cpp
2013-11-9 11:9:44 WORLD ===> Function--->logFunc, Line: 26, File: C:\Documents and Settings\Administrator\hLآ\bcbTest\Unit1.cpp

       那怎么办呢？人类的智慧是无穷的，你要知道。考虑利用宏，如下：

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

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include 
#include 
#include 
#include 

#define log(msg) logFunc(__FUNC__, __LINE__, __FILE__, msg)

//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE-managed Components
    TButton *Button1;
    TButton *Button2;
    void __fastcall Button2Click(TObject *Sender);
    void __fastcall Button1Click(TObject *Sender);
private:	// User declarations
public:		// User declarations
    __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

 

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

#include 
#pragma hdrstop
#include 
#include 
#include 
#include 
using namespace std;


#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

void logFunc(char *function, int line, char *file, char *msg)
{
    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[2048] = {0};
    sprintf(szLocation, "%s ===> Function--->%s, Line: %d, File: %s", msg, function, line, file);

    char buf[2500] = {0};
    sprintf(buf, "%s %s", szTime, szLocation);
    ofstream outfile("log.txt", ios::app);
    outfile << buf << endl;
}


//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{

}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    log("HELLO");
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)
{
    log("WORLD");
}
//---------------------------------------------------------------------------

      这样就对了。但是，还存在一个问题，log宏不支持变参，当你用log("num is %d", num);的时候就会出错，那怎么办呢？相信一切都是有出路的，我们下次见。