日志类库框架

　　一个错误报告日志的框架，编译成动态库，不过功能还不够完善。

　　利用C++输出文件流的类ofstream 来实现日志记录功能：

　　使用ios::out和ios::app的方式打开（文件以输出方式打开(内存数据输出到文件)；以追加方式打开文件）

private:
	__Log()
	{
		 StreamObject.open( "刘大大.log", std::ios::out | std::ios::app );
	}
	__Log(const __Log&) = delete;
	__Log& operator = (const __Log&) = delete;

private:
	ofstream StreamObject;

　　

　　效果：

　　

　　源代码：

#pragma once
#include <windows.h>
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdio>
using namespace std;
enum _LOG_LEVEL_
{
    Fatal = 0,
    Error,
    Critical,
    Warning,
    Normal,
    Verbose
};


class __Log
{
public:
    ~__Log();
    static __Log& Instance()
    {
        static __Log LogObject;
        return LogObject;
    }
    
    BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel, const char* Format, ...);
    BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel, const char* Format, va_list ParameterData);
private:
    __Log()
    {    
        //以输出方式打开(内存数据输出到文件)；以追加的方式打开文件
         StreamObject.open( "刘大大.log", std::ios::out | std::ios::app );
    }
    __Log(const __Log&) = delete;
    __Log& operator = (const __Log&) = delete;

private:
    ofstream StreamObject;
};

#include "Common.h"

static const char* __LogLevel[] = { "*致命*", "*错误*", "*关键*", "*警告*", "*普通*", "*冗长*" };
__Log::~__Log()
{
    StreamObject << endl;
}
BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel,const char* Format, ...)
{
    //初始化指向可变参数列表的指针
    va_list ParameterData;
    bool IsOk = FALSE;
    //将第一个可变参数的地址付给ap，即ap指向可变参数列表的开始
    va_start(ParameterData, Format);
    IsOk = RecordLog(LogLevel, Format, ParameterData);
    //ParameterData赋值为0，没什么实际用处，主要是为程序健壮性
    va_end(ParameterData);

    return IsOk;
}
BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel,const char* Format, va_list ParameterData)
{
    char BufferData[2048] = { 0 };
    char MessageData[0x1000] = { 0 };
    char TimeData[256] = { 0 };

    auto TimeObject = time(NULL);
    tm v1;
    localtime_s(&v1, &TimeObject);
    strftime(TimeData, _countof(TimeData), "%Y-%m-%d %H:%M:%S", &v1);
    //将参数fmt、ap指向的可变参数一起转换成格式化字符串，放string数组中，其作用同sprintf，只是参数类型不同
    vsprintf_s(BufferData, _countof(BufferData), Format, ParameterData);
    sprintf_s(MessageData, _countof(MessageData), "%s %-5s %s", TimeData, 
        __LogLevel[LogLevel], BufferData);

    StreamObject << MessageData << std::endl;  //写入到日志

    return true;
}

#pragma once
#include <windows.h>
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdio>
using namespace std;

enum _LOG_LEVEL_
{
    Fatal = 0,
    Error,
    Critical,
    Warning,
    Normal,
    Verbose  
};

//用__declspec(dllexport)显式的定义dll接口给调用它的exe或dll文件，
class _declspec (dllexport) __Log
{
public:
    __Log();
    ~__Log();
    static __Log& __Log::Instance();
    BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel, const char* Format, ...);
    BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel,const char* Format, va_list ParameterData);

protected:
private:
    std::ofstream StreamObject;

};

#include "Common.h"

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

// Log.cpp : 定义控制台应用程序的入口点。
//
#include <windows.h>
#include <iostream>

using namespace std;
#include "..\__Log\__Log.h"

#ifdef _WIN64
#pragma comment(lib,"..\x64\debug\__log.lib")
#else
#pragma comment(lib,"..\debug\__Log.lib")
#endif
int main()
{
    /*
    int   v1 = 10;
    char* v2 = "函数错误";
    __Log::Instance().RecordLogEx(Warning,"%d %s",v1,v2);
    __Log::Instance().RecordLogEx(Fatal,"%s",v2);
    __Log::Instance().RecordLogEx(Fatal,"%s %f %f %d %s",v2,4.1,4.4,100,"HelloWorld");
    */


    //char* v1 = NULL;


    __try
    {
        int a = 1;
        a = a / 0;
        //memcpy(v1,"HelloWorld",10);

    }
    __except(EXCEPTION_EXECUTE_HANDLER)
    {
        int LastError = GetLastError();
        __Log::Instance().RecordLogEx(Fatal,"%d %s",LastError,"继续努力");
    }
    return 0;
}