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, int nString);void AFXAPI AfxFormatStrings(CString& rString, LPCTSTR lpszFormat, LPCTSTR const* rglpsz, int nString);/ 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, int iSubString, TCHAR chSep = n);/ Strings in format .%1 . %2 . etc. void AFXAPI AfxFormatStrings(CString& rString, UINT nIDS,LPCTSTR const* rglpsz, int nString)TCHAR szFormat256;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, int nString)/ 计算结果字符串的长度int nTotalLen = 0;LPCTSTR pchSrc = lpszFormat;while (*pchSrc != 0)if (pchSrc0 = % &( (pchSrc1 = 0 & pchSrc1 = A & pchSrc1 9)i = 9 + (pchSrc1 - A);elsei = pchSrc1 - 1;pchSrc += 2;if (i = nString)+nTotalLen;else if (rglpszi != NULL)nTotalLen += lstrlen(rglpszi);elseif (_istlead(*pchSrc)+nTotalLen, +pchSrc;+pchSrc;+nTotalLen;pchSrc = lpszFormat;LPTSTR pchDest = rString.GetBuffer(nTotalLen);while (*pchSrc != 0)if (pchSrc0 = % &( (pchSrc1 = 0 & pchSrc1 = A & pchSrc1 9)i = 9 + (pchSrc1 - A);elsei = pchSrc1 - 1;pchSrc += 2;if (i = nString)TRACE1(Error: illegal string index requested %d.n, i);*pchDest+ = ?;else if (rglpszi != NULL)lstrcpy(pchDest, rglpszi);pchDest += lstrlen(pchDest);elseif (_istlead(*pchSrc) / *pchSrc是否多字节字符的首字节*pchDest+ = *pchSrc+; / 拷贝首字节*pchDest+ = *pchSrc+;rString.ReleaseBuffer(int)(LPCTSTR)pchDest - (LPCTSTR)rString);/ ReleaseBuffer will assert if we went too farvoid AFXAPI AfxFormatString1(CString& rString, UINT nIDS, LPCTSTR lpsz1)AfxFormatStrings(rString, nIDS, &lpsz1, 1);void AFXAPI AfxFormatString2(CString& rString, UINT nIDS, LPCTSTR lpsz1,LPCTSTR lpsz2)LPCTSTR rglpsz2;rglpsz0 = lpsz1;rglpsz1 = lpsz2;AfxFormatStrings(rString, nIDS, rglpsz, 2);BOOL AFXAPI AfxExtractSubString(CString& rString, LPCTSTR lpszFullString,int iSubString, TCHAR chSep)if (lpszFullString = NULL)return FALSE;while (iSubString-)lpszFullString = _tcschr(lpszFullString, chSep);if (lpszFullString = NULL)rString.Empty(); / return empty string as wellreturn FALSE;lpszFullString+; / point past the separatorLPCTSTR lpchEnd = _tcschr(lpszFullString, chSep);int nLen = (lpchEnd = NULL) ? lstrlen(lpszF