visual C++实现MFC动态库运用debugview输出日志1:将调试信息运行时发送至DebugView

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#pragma once

// 本类可以将调试信息运行时发送至DebugView
// 引用至 https://www.codeproject.com/Articles/1053/Using-an-output-stream-for-debugging
// Dxw 2017-04-03

#include <Windows.h>
#include <ostream>
#include <sstream>
#include <string>

template <class CharT, class TraitsT = std::char_traits<CharT> >
class basic_debugbuf : 
    public std::basic_stringbuf<CharT, TraitsT>
{
public:

    virtual ~basic_debugbuf()
    {
        sync();
    }

protected:

    int sync()
    {
        output_debug_string(str().c_str());
        str(std::basic_string<CharT>());    // Clear the string buffer

        return 0;
    }

    void output_debug_string(const CharT *text) {}
};

template<>
void basic_debugbuf<char>::output_debug_string(const char *text)
{
    ::OutputDebugStringA(text);
}

template<>
void basic_debugbuf<wchar_t>::output_debug_string(const wchar_t *text)
{
    ::OutputDebugStringW(text);
}

template<class CharT, class TraitsT = std::char_traits<CharT> >
class basic_dostream : 
    public std::basic_ostream<CharT, TraitsT>
{
public:

    basic_dostream() : std::basic_ostream<CharT, TraitsT>
                (new basic_debugbuf<CharT, TraitsT>()) {}
    ~basic_dostream() 
    {
        delete rdbuf(); 
    }
};

typedef basic_dostream<char>    dostream;
typedef basic_dostream<wchar_t> wdostream;

// 快速使用宏 
// 例如: DI<<"结果为："<<9;
// Dxx为DebugView过滤用的关键字
#define DI wdostream()<<L"MPTC INFO "<<L"\t"
#define DW wdostream()<<L"MPTC WARNING "<<L"\t"
#define DE wdostream()<<L"MPTC ERROR "<<L"\t"
#define DF wdostream()<<L"MPTC FATAL "<<L"\t"