C++实现字符格式相互转换的示例代码
作者:欧特克_Glodon
这篇文章主要为大家详细介绍了C++中实现字符格式相互转换的方法,主要有UTF8与string互转、wstring与string互转,感兴趣的小伙伴可以了解一下
一、UTF8转std:string
std::string UTF8_To_string(const std::string& str) { int nwLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0); wchar_t* pwBuf = new wchar_t[nwLen + 1]; //一定要加1,不然会出现尾巴 memset(pwBuf, 0, nwLen * 2 + 2); MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), pwBuf, nwLen); int nLen = WideCharToMultiByte(CP_ACP, 0, pwBuf, -1, NULL, NULL, NULL, NULL); char* pBuf = new char[nLen + 1]; memset(pBuf, 0, nLen + 1); WideCharToMultiByte(CP_ACP, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL); std::string strRet = pBuf; delete[]pBuf; delete[]pwBuf; pBuf = NULL; pwBuf = NULL; return strRet; }
二、string_To_UTF8
std::string string_To_UTF8(const std::string& str) { int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0); wchar_t* pwBuf = new wchar_t[nwLen + 1]; //一定要加1,不然会出现尾巴 ZeroMemory(pwBuf, nwLen * 2 + 2); ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen); int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL); char* pBuf = new char[nLen + 1]; ZeroMemory(pBuf, nLen + 1); ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL); std::string strRet(pBuf); delete[]pwBuf; delete[]pBuf; pwBuf = NULL; pBuf = NULL; return strRet; }
三、wstring转string
std::string wstring2string(std::wstring wstr) { string result; int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL); if (len <= 0)return result; char* buffer = new char[len + 1]; if (buffer == NULL)return result; WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL); buffer[len] = '\0'; result.append(buffer); delete[] buffer; return result; }
四、string转wstring
std::wstring string2wstring(std::string str) { wstring result; int len = MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), NULL, 0); if (len < 0)return result; wchar_t* buffer = new wchar_t[len + 1]; if (buffer == NULL)return result; MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), buffer, len); buffer[len] = '\0'; result.append(buffer); delete[] buffer; return result; }
五、unicode属性和多字节属性转换(char转wchar_t)
// WideChar.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include <windows.h> #include <iostream> #include <atlbase.h> //#include <comutil.h> #include <atlstr.h> using namespace std; //方法1:MultiByteToWideChar, WideCharToMultiByte void Way_1() { //char转wchar_t char *p1 = "abc"; wchar_t p2[20] = L"EFG"; MultiByteToWideChar(CP_ACP, 0, p1, strlen(p1) + 1, p2, sizeof(p2)); printf("%S\n", p2); //wchar_t转char wchar_t *p3= L"EFG"; char p4[20]; WideCharToMultiByte(CP_ACP, 0, p3, -1, p4, sizeof(p4), NULL, NULL); printf("%s\n", p4); } //方法2:A2W, W2A, T2A, A2T void Way_2() { //需要添加头文件 <atlbase.h> char * p1 = "abc"; wchar_t *p2 = L"def"; TCHAR *P3 = _T("CC"); USES_CONVERSION; wchar_t *p5 = A2W(p1); char * p4 = T2A(P3); } 方法3: //void Way_3() //{//需要添加头文件<comutil.h>,一般在MFC工程下使用 // CString str = "abc";//只能存一种 // _bstr_t bstr = "abc";//可以用非unicode // bstr += L"efg";//可以用unicode // char *p = bstr; // wchar_t *p2 = bstr; //} int main() { Way_1(); //Way_2(); return 0; }
六、Unicode ansi utf8转换
int Unicode2UTF8(const wchar_t* pUnicode, char* pUTF8Buffer, int nBufferSize) { if( (nBufferSize == 0) && (pUTF8Buffer != NULL) ) return 0; int result = WideCharToMultiByte(CP_UTF8, NULL, pUnicode, -1, pUTF8Buffer, nBufferSize, NULL, NULL); if ((result > 0) && (pUTF8Buffer != NULL)) pUTF8Buffer[result-1] = 0; return result; } int UTF82Unicode(const char* pUTF8, wchar_t* pUnicodeBuffer, int nBufferSize) { if( (nBufferSize == 0) && (pUnicodeBuffer != NULL) ) return 0; int result = MultiByteToWideChar(CP_UTF8, NULL, pUTF8, -1, pUnicodeBuffer, nBufferSize); if ((result > 0) && (pUnicodeBuffer != NULL)) pUnicodeBuffer[result-1] = 0; return result; } int Unicode2Ansi(const wchar_t* pUnicode, char* pAnsiBuffer, int nBufferSize) { if( (nBufferSize == 0) && (pAnsiBuffer != NULL) ) return 0; int result = ::WideCharToMultiByte(CP_ACP, 0, pUnicode, -1, pAnsiBuffer, nBufferSize, NULL, NULL); if ((result > 0) && (pAnsiBuffer != NULL)) pAnsiBuffer[result-1] = 0; return result; } int Ansi2Unicode(const char* pAnsi, wchar_t* pUnicodeBuffer, int nBufferSize) { if( (nBufferSize == 0) && (pUnicodeBuffer != NULL) ) return 0; int result = ::MultiByteToWideChar(CP_ACP, 0, pAnsi, -1, pUnicodeBuffer, nBufferSize); if ((result > 0) && (pUnicodeBuffer != NULL)) pUnicodeBuffer[result-1] = 0; return result; }
简单实用
CString strBuf; int nSize = Unicode2UTF8(strBuf, NULL, 0); char* szBuf = new char[nSize]; Unicode2UTF8(strBuf, szBuf, nSize);
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