C++个字符串之间转换

/*  * GB2312/Unicode/UTF-8转换  * WLCIMS WorkStation 2008-09-08  * http://wlcims.cn  */  #ifndef __OCUGX_H__ #define __OCUGX_H__  class ocUgx{   public:      // --------- UTF-8转Unicode，单字 ----------------     int cU8xU(WCHAR* pOut,char *pText){       int ret = 0;       char* uchar = (char *)pOut;       unsigned cIn = (unsigned char)pText[0];       if(cIn<0x80){              // ASCII  0x00 ~ 0x7f         pOut[0] = pText[0];       }else if(cIn<0xdf){         uchar[0] = (pText[0]<<6)|(pText[1]&0x3f);         uchar[1] = (pText[0]>>2)&0x0f;         ret = 1;       }else if(cIn<0xef){         uchar[0] = (pText[1]<<6)|(pText[2]&0x3f);         uchar[1] = (pText[0]<<4)|((pText[1]>>2)&0x0f);         ret = 2;       }else if(cIn<0xf7){         uchar[0] = (pText[2]<<6)|(pText[3]&0x3f);         uchar[1] = (pText[1]<<4)|((pText[2]>>2)&0x0f);         uchar[2] = ((pText[0]<<2)&0x1c)|((pText[1]>>4)&0x03);         ret = 3;       }       return ret;     }      // ---------- Unicode转UTF-8，单字 ------------------     int cUxU8(char* pOut,WCHAR* pText){        int ret = 0;        unsigned char* pchar = (unsigned char *)pText;       if(pText[0]<=0x7f){         // ASCII  0x00 ~ 0x7f         pOut[0] = (char)pchar[0];       }else if(pText[0]<=0x7ff){  // 0x080 ~ 0x7ff         pOut[0] = 0xc0|(pchar[1]<<2)|(pchar[0]>>6);         pOut[1] = 0x80|(pchar[0]&0x3f);         ret = 1;       }else{                      // 0x0800 ~ 0xFFFF          pOut[0] = 0xe0|(pchar[1]>>4);          pOut[1] = 0x80|((pchar[1]&0x0f)<<2)|(pchar[0]>>6);          pOut[2] = 0x80|(pchar[0]&0x3f);         ret = 2;       }       return ret;     }      // ----------- Unicode转GB2312，单字 ------------------     int cUxG(char* pOut,WCHAR* pText){       int ret = 0;       if(pText[0]<0x80){        // ASCII  0x00 ~ 0x7f         pOut[0] = (char)pText[0];       }else{         ::WideCharToMultiByte(CP_ACP,0,pText,1,pOut,sizeof(WCHAR),NULL,NULL);         ret = 1;       }       return ret;     }     // ----------- GB2312转Unicode，单字 ------------------     int cGxU(WCHAR* pOut,char* pText){       int ret = 0;       if((unsigned)pText[0]<0x80){        // ASCII  0x00 ~ 0x7f         pOut[0] = (WCHAR)pText[0];       }else{          ::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,pText,2,pOut,1);          ret = 1;       }       return ret;     }     // ------------ UTF-8转Unicode，字符串 ----------------     int sU8xU(WCHAR* pOut,char *pText,int Len){       int i,j;       for(i=0,j=0;i<Len;i++,j++){         i+=cU8xU(&pOut[j],&pText[i]);       }       return j;     }      // ------------ Unicode转UTF-8，字符串 ----------------      int sUxU8(char* pOut,WCHAR* pText,int Len){        int i,j;        for(i=0,j=0;i<Len;i++,j++){          j+=cUxU8(&pOut[j],&pText[i]);        }        return j;      }      // ------------ Unicode转GB2312，字符串 ----------------      int sUxG(char* pOut,WCHAR* pText,int Len){        int i,j;        for(i=0,j=0;i<Len;i++,j++){          j+=cUxG(&pOut[j],&pText[i]);        }        return j;      }      // ------------ GB2312转Unicode，字符串 ----------------      int sGxU(WCHAR* pOut,char* pText,int Len){        int i,j;        for(i=0,j=0;i<Len;i++,j++){          i+=cGxU(&pOut[j],&pText[i]);        }        return j;      }      // ------------ GB2312转UTF-8，字符串 ------------------      int sGxU8(char* pOut,char* pText,int Len){        int i,j;        WCHAR buf;        for(i=0,j=0;i<Len;i++,j++){          if((unsigned)pText[0]<0x80){       // ASCII  0x00 ~ 0x7f            pOut[j] = pText[i];          }else{            i += cGxU(&buf,&pText[i]);            j += cUxU8(&pOut[j],&buf);          }        }        return j;      }      // ------------ UTF-8转GB2312，字符串 ------------------      int sU8xG(char* pOut,char* pText,int Len){        int i,j;        WCHAR buf;        for(i=0,j=0;i<Len;i++,j++){          if((unsigned)pText[0]<0x80){       // ASCII  0x00 ~ 0x7f            pOut[j] = pText[i];          }else{            i += cU8xU(&buf,&pText[i]);            j += cUxG(&pOut[j],&buf);          }        }        return j;      }  };  #endif 感谢你的贴子，帮助我解决了困扰一下午的难题，不过发现其中有出笔误。下面代码里if条件判断表达式中的pText[0] 应该是pText[i]// ------------ UTF-8转GB2312，字符串 ------------------ int sU8xG(char* pOut,char* pText,int Len){ int i,j; WCHAR buf; for(i=0,j=0;i<Len;i++,j++){ if((unsigned)pText[0]<0x80){ // ASCII 0x00 ~ 0x7f pOut[j] = pText[i]; }else{ i += cU8xU(&buf,&pText[i]); j += cUxG(&pOut[j],&buf); } } return j; } Feedback# re: Windows API GB2312/Unicode/UTF-8转换  回复  更多评论   2011-02-22 02:06 by Michael Genn我也来纠正个错误: cU8xU (UTF-8转Unicode, 单字) 这个函数在转换全角的逗号("，")时出现转换不正确的问题.原因在于判断cIn值的部分有问题, 应该把其中的一些小于号改为小于等于.下面是我给出的改正版:int cU8xU(wchar_t* pOut,char *pText){int ret = 0; char* uchar = (char *)pOut; unsigned cIn = (unsigned char)pText[0]; if(cIn<0x80){ // ASCII 0x00 ~ 0x7f pOut[0] = pText[0]; }else if(cIn<0xdf){ uchar[0] = (pText[0]<<6)|(pText[1]&0x3f); uchar[1] = (pText[0]>>2)&0x0f; ret = 1; }else if(cIn<=0xef){ uchar[0] = (pText[1]<<6)|(pText[2]&0x3f); uchar[1] = (pText[0]<<4)|((pText[1]>>2)&0x0f); ret = 2; }else if(cIn<0xf7){ uchar[0] = (pText[2]<<6)|(pText[3]&0x3f); uchar[1] = (pText[1]<<4)|((pText[2]>>2)&0x0f); uchar[2] = ((pText[0]<<2)&0x1c)|((pText[1]>>4)&0x03); ret = 3; } return ret; }