|
輸入 ： a1,a2,a10,a001 我們知道，如果按照字符串比較,結果應該是 a001,a1,a10,a2,但我們期望的結果應該是a001,a1,a2,a10. 自己寫了一個算法，請參考，或者有更好的算法，請賜教 /* Return Value Description < 0 arg1 less than arg2 0 arg1 equivalent to arg2 > 0 arg1 greater than arg2 */ int compare(const void* arg1,const void* arg2) { if (NULL==arg1||NULL==arg2)//address of item return 0; LPSTR lpText1 = *( TCHAR** )arg1; //content of item LPSTR lpText2 = *( TCHAR** )arg2; //content of item if (NULL==lpText1||NULL==lpText2) return 0; int nText1Len = _tcslen(lpText1); int nText2Len = _tcslen(lpText2); int nText1IndexHandled = 0; int nText2IndexHandled = 0; int nRet = 0; for (;;) { if (nText1IndexHandled==nText1Len||nText2IndexHandled==nText2Len) //don't compare complete since all are same, "ab","abc" { TCHAR chOffset1 = nText1IndexHandled<nText1Len?lpText1[nText1IndexHandled]:0; TCHAR chOffset2 = nText2IndexHandled<nText2Len?lpText2[nText2IndexHandled]:0; nRet = (int)((WORD)chOffset1-(WORD)chOffset2); break; } TCHAR ch1 = *(lpText1+nText1IndexHandled); TCHAR ch2 = *(lpText2+nText2IndexHandled); if (isdigit(ch1)&&isdigit(ch2)) // if digit, change to number and compare { TCHAR* lpNum1 = new TCHAR[nText1Len]; TCHAR* lpNum2 = new TCHAR[nText2Len]; if (NULL==lpNum1||NULL==lpNum2) return 0; memset(lpNum1,0,nText1Len*sizeof(TCHAR)); memset(lpNum2,0,nText2Len*sizeof(TCHAR)); extractnumber(lpText1,nText1Len,nText1IndexHandled,lpNum1); extractnumber(lpText2,nText2Len,nText2IndexHandled,lpNum2); nRet = comparenumber(lpNum1,lpNum2); delete[] lpNum1; delete[] lpNum2; } else { nRet = (int)((WORD)ch1-(WORD)ch2); nText1IndexHandled++; nText2IndexHandled++; } if (nRet!=0) break; } return nRet; } TCHAR* extractnumber(TCHAR* lpBuf,int nLen,int& nIndexBegin,TCHAR* lpNumber) { if (NULL==lpBuf||NULL==lpNumber) return lpNumber; for (int i=nIndexBegin,nIndex=0;i<nLen;++i,++nIndexBegin) { TCHAR ch = *(lpBuf+i); if (!isdigit(ch)) break; lpNumber[nIndex++]=ch; } return lpNumber; } int comparenumber(TCHAR* lpNumber1,TCHAR* lpNumber2) { if (NULL==lpNumber1||NULL==lpNumber2) return 0; int nNum1Len = _tcslen(lpNumber1); int nNum2Len = _tcslen(lpNumber2); int nMaxLen = max(nNum1Len,nNum2Len); TCHAR* lpFormatNum1 = new TCHAR[nMaxLen+1]; TCHAR* lpFormatNum2 = new TCHAR[nMaxLen+1]; if (NULL==lpFormatNum1||NULL==lpFormatNum2) return 0; memset(lpFormatNum1,_T('0'),nMaxLen*sizeof(TCHAR)); memset(lpFormatNum2,_T('0'),nMaxLen*sizeof(TCHAR)); lpFormatNum1[nMaxLen]=0; lpFormatNum2[nMaxLen]=0; int nPos = 0, nRet = 0; int nIndex = nMaxLen-1; for (nPos=nNum1Len-1;nPos>=0;--nPos) lpFormatNum1[nIndex--]=lpNumber1[nPos]; nIndex = nMaxLen-1; for (nPos=nNum2Len-1;nPos>=0;--nPos) lpFormatNum2[nIndex--]=lpNumber2[nPos]; for (nPos=0;nPos<nMaxLen;++nPos) { nRet = lpFormatNum1[nPos]-lpFormatNum2[nPos]; if (nRet!=0) break; } delete[] lpFormatNum1; delete[] lpFormatNum2; return nRet; } |
