输入 : a1,a2,a10,a001
我们知道,如果按照字符串比较,结果应该是 a001,a1,a10,a2,但我们期望的结果应该是a001,a1,a2,a10.
自己写了一个算法,请参考,或者有更好的算法,请赐教
/*
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 TCHAR chOffset2 = nText2IndexHandled 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 { 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 { nRet = lpFormatNum1[nPos]-lpFormatNum2[nPos]; if (nRet!=0) break; } delete[] lpFormatNum1; delete[] lpFormatNum2; return nRet; }
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