程序中如何打印日志？(三) VC++6.0和BCB6.0都不支持变长参数的宏

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接着前面的来讲。但是遗憾的是，无论是VC++6.0还是BCB6.0, 都不支持变长参数的宏，所以在这种环境下，无法彻底解决之前的问题（在VS2005中可以）。既然如此，我们只能求其次了，还是利用变成参数的函数来迂回解决吧：

//---------------------------------------------------------------------------#ifndef Unit1H#define Unit1H//---------------------------------------------------------------------------#include <Classes.hpp>#include <Controls.hpp>#include <StdCtrls.hpp>#include <Forms.hpp>#define POS __FUNC__, __LINE__, __FILE__//---------------------------------------------------------------------------class TForm1 : public TForm{__published:// IDE-managed Components    TButton *Button1;    TButton *Button2;    void __fastcall Button2Click(TObject *Sender);    void __fastcall Button1Click(TObject *Sender);private:// User declarationspublic:// User declarations    __fastcall TForm1(TComponent* Owner);};//---------------------------------------------------------------------------extern PACKAGE TForm1 *Form1;//---------------------------------------------------------------------------#endif

//---------------------------------------------------------------------------#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;void log(char *function, int line, char *file, char *format, ...){va_list args;va_start(args, format);char buf[1024] = {0};vsprintf(buf, format, args);va_end(args);    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", buf, function, line, file);    char szLog[2048] = {0};    sprintf(szLog, "%s %s ", szTime, szLocation);    ofstream outfile("log.txt", ios::app);    outfile << szLog << endl;}//---------------------------------------------------------------------------__fastcall TForm1::TForm1(TComponent* Owner)    : TForm(Owner){}//---------------------------------------------------------------------------void __fastcall TForm1::Button1Click(TObject *Sender){    log(POS, "HELLO");}//---------------------------------------------------------------------------void __fastcall TForm1::Button2Click(TObject *Sender){    int a = 1;    log(POS, "WORLD%d", a);}//---------------------------------------------------------------------------

最后说一句，如果支持变成参数的宏，那该多好啊, 那时，POS都不用写。VS2005就可以，有__VA_ARGS__啊。

睡觉了。