MFC中几个有用的字符串操作函数.docx

MFC中几个有用的字符串操作函数MFC中有几个字符串操作函数很有用，但有的在MSDN中都查不到，因为MSDN没有公布。下面我们来看看它们的用法和声明及定义等。// 功能：格式化字符串// 参数：rString－输出参数，格式化后的字符串将保存在此字符串中// nIDS－将进行替换操作的格式字符串的资源ID// lpsz1 －指向将替换格式字符串中“%1”字符的字符串// lpsz2 －指向将替换格式字符串中“%2”字符的字符串void AFXAPI AfxFormatString1(CString rString, UINT nIDS, LPCTSTR lpsz1);void AFXAPI AfxFormatString2(CString rString, UINT nIDS, LPCTSTR lpsz1, LPCTSTR lpsz2);// Implementation string helpersvoid AFXAPI AfxFormatStrings(CString rString, UINT nIDS, LPCTSTR const* rglpsz, intnString);void AFXAPI AfxFormatStrings(CString rString, LPCTSTR lpszFormat, LPCTSTR const* rglpsz, intnString);// 功能：获取子字符串// 参数：rString－输出参数，保存子字符串// lpszFullString－源字符串// iSubString－子字符串索引，从0开始计数// chSep－子字符串间的分隔字符，默认为\nBOOL AFXAPI AfxExtractSubString(CString rString, LPCTSTR lpszFullString, intiSubString, TCHAR chSep = \n);////////////////////////////////////////////////////////////////////////////////////////////////////// Strings in format .....%1 .... %2 .... etc. void AFXAPI AfxFormatStrings(CString rString, UINT nIDS,LPCTSTR const* rglpsz, intnString){TCHAR szFormat[256];if (!AfxLoadString(nIDS, szFormat) != 0){TRACE1(Error: failed to load AfxFormatString string 0x%04x.\n, nIDS);ASSERT(FALSE);return;}AfxFormatStrings(rString, szFormat, rglpsz, nString);}void AFXAPI AfxFormatStrings(CString rString, LPCTSTR lpszFormat,LPCTSTR const* rglpsz, intnString){// 计算结果字符串的长度intnTotalLen = 0;LPCTSTR pchSrc = lpszFormat;while (*pchSrc != \0){if (pchSrc[0] == % ( (pchSrc[1] = 0 pchSrc[1] = 9) ||(pchSrc[1] = A pchSrc[1] = Z)) ){// %A comes after %9 -- well need it somedayinti;if (pchSrc[1] 9)i = 9 + (pchSrc[1] - A);elsei = pchSrc[1] - 1;pchSrc += 2;if (i = nString)++nTotalLen;else if (rglpsz[i] != NULL)nTotalLen += lstrlen(rglpsz[i]);}else{if (_istlead(*pchSrc))++nTotalLen, ++pchSrc;++pchSrc;++nTotalLen;}}pchSrc = lpszFormat;LPTSTR pchDest = rString.GetBuffer(nTotalLen);while (*pchSrc != \0){if (pchSrc[0] == % ( (pchSrc[1] = 0 pchSrc[1] = 9) ||(pchSrc[1] = A pchSrc[1] = Z)) ){// %A comes a