10 编码转换问题

字符编码问题

Windows API 函数
MessageBoxA:MessageBox 内部实现，字符串编码(ANSI)转换成了Unicode,在调用MessageboxW
MessageBox:是一个宏定义
MessageBoxA(NULL,"Hello","提示",MB_OK);
MessageBoxW(NULL,L"Hello",L"提示",MB_OK);

编码转换问题

ANSI转Unicode

//ANSI转Unicode
wchar_t* CCharset::AnsiToUnicode(const char* str)
{if (m_wstr)//安全{delete m_wstr;m_wstr = NULL;}DWORD dwSize=::MultiByteToWideChar(CP_ACP,0,str,-1,NULL,0);//求宽字符的大小m_wstr = new wchar_t[dwSize];::MultiByteToWideChar(CP_ACP, 0, str, -1, m_wstr, dwSize);return m_wstr;
}

Unicode转ANSI

//Unicode转ANSI
char * CCharset::UnicodeToAnsi(const wchar_t * wstr)
{if (m_str){delete m_str;m_str = NULL;}DWORD dwSize=WideCharToMultiByte(CP_ACP, 0, wstr, -1,NULL,0,NULL,NULL);m_str = new char[dwSize];::WideCharToMultiByte(CP_ACP, 0, wstr, -1, m_str, dwSize, NULL, NULL);return m_str;
}

Utf8转 ANSI

char * CCharset::Utf8ToAnsi(const char * str)
{if (m_wstr){delete[] m_wstr;m_wstr = NULL;}if (m_str){delete[] m_str;m_str = NULL;}//UTF-8 转Unicodem_wstr= Utf8ToUnicode(str);//Unicode 转ANSIm_str= UnicodeToAnsi(m_wstr);return m_str;
}

utf8 转Unicode

wchar_t* CCharset::Utf8ToUnicode(const char * str)
{if (m_wstr){delete m_wstr;m_wstr = NULL;}DWORD dwSize=MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);m_wstr = new wchar_t[dwSize];memset(m_wstr, 0, dwSize*sizeof(wchar_t));//清空内存MultiByteToWideChar(CP_UTF8, 0, str, -1, m_wstr, dwSize);return m_wstr;
}

ANSI 转UTF-8

char* CCharset::AnsitoUtf8(const char* str)
{if (m_wstr){delete[] m_wstr;m_wstr = NULL;}if (m_utf8){delete[] m_utf8;m_utf8 = NULL;}//Ansi 转Unicodem_wstr= AnsiToUnicode(str);//Unicode 转UTF-8m_utf8=UnicodeToUtf8(m_wstr);return m_utf8;
}

Unicode 转 UTF-8

char * CCharset::UnicodeToUtf8(const wchar_t * wstr)
{if (m_utf8){delete[] m_utf8;m_utf8 = NULL;}DWORD dwSize=WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);m_utf8 = new char[dwSize];memset(m_utf8,0,dwSize);//清空内存WideCharToMultiByte(CP_UTF8, 0, wstr, -1, m_utf8, dwSize, NULL, NULL);return m_utf8;
}

全部代码

CCharset.h

#pragma once
class CCharset
{private:wchar_t* m_wstr;char* m_str;char* m_utf8;
public:CCharset();~CCharset();//ANSI转Unicodewchar_t* AnsiToUnicode(const char* str);//Unicode转ANSIchar* UnicodeToAnsi(const wchar_t* wstr);//UTF8 转ANSIchar* Utf8ToAnsi(const char* str);//ANSI转UTF - 8char* AnsitoUtf8(const char* str);//Unicode 转 UTF-8char* UnicodeToUtf8(const wchar_t* wstr);//UTF-8转Unicodewchar_t* Utf8ToUnicode(const char* str);};

CCharset.cpp

#include "pch.h"
#include "CCharset.h"CCharset::CCharset()
{m_wstr = NULL;m_str = NULL;m_utf8 = NULL;
}CCharset::~CCharset()
{if (m_wstr){delete m_wstr;m_wstr = NULL;}if (m_str){delete m_str;m_str = NULL;}if (m_utf8){delete[] m_utf8;m_utf8 = NULL;}
}//ANSI转Unicode
wchar_t* CCharset::AnsiToUnicode(const char* str)
{if (m_wstr)//安全{delete[] m_wstr;m_wstr = NULL;}DWORD dwSize=::MultiByteToWideChar(CP_ACP,0,str,-1,NULL,0);//求宽字符的大小m_wstr = new wchar_t[dwSize];::MultiByteToWideChar(CP_ACP, 0, str, -1, m_wstr, dwSize);return m_wstr;
}//Unicode转ANSI
char * CCharset::UnicodeToAnsi(const wchar_t * wstr)
{if (m_str){delete[] m_str;m_str = NULL;}DWORD dwSize=WideCharToMultiByte(CP_ACP, 0, wstr, -1,NULL,0,NULL,NULL);//求字符的大小m_str = new char[dwSize];::WideCharToMultiByte(CP_ACP, 0, wstr, -1, m_str, dwSize, NULL, NULL);return m_str;
}char * CCharset::Utf8ToAnsi(const char * str)
{if (m_wstr){delete[] m_wstr;m_wstr = NULL;}if (m_str){delete[] m_str;m_str = NULL;}//UTF-8 转Unicodem_wstr= Utf8ToUnicode(str);//Unicode 转ANSIm_str= UnicodeToAnsi(m_wstr);return m_str;
}char* CCharset::AnsitoUtf8(const char* str)
{if (m_wstr){delete[] m_wstr;m_wstr = NULL;}if (m_utf8){delete[] m_utf8;m_utf8 = NULL;}//Ansi 转Unicodem_wstr= AnsiToUnicode(str);//Unicode 转UTF-8m_utf8=UnicodeToUtf8(m_wstr);return m_utf8;
}//Unicode 转 UTF-8
char * CCharset::UnicodeToUtf8(const wchar_t * wstr)
{if (m_utf8){delete[] m_utf8;m_utf8 = NULL;}DWORD dwSize=WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);m_utf8 = new char[dwSize];memset(m_utf8,0,dwSize);//清空内存WideCharToMultiByte(CP_UTF8, 0, wstr, -1, m_utf8, dwSize, NULL, NULL);return m_utf8;
}//utf8 转Unicode
wchar_t* CCharset::Utf8ToUnicode(const char * str)
{if (m_wstr){delete m_wstr;m_wstr = NULL;}DWORD dwSize=MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);m_wstr = new wchar_t[dwSize];memset(m_wstr, 0, dwSize*sizeof(wchar_t));//清空内存MultiByteToWideChar(CP_UTF8, 0, str, -1, m_wstr, dwSize);return m_wstr;
}