How to get random string using C++ - 用 C++ 如何获取随机字符串

void CprjGetRandomStringTestDlg::OnBnClickedbtngetrandomstring(){CString strRandom;int i;bool bReturn;CString strMsg;for(i = 0;i < 100;i++){bReturn = GetRandomString(strRandom,strMsg);if(bReturn){TRACE(_T("%s/r/n"),strRandom);}else{}}}//Defination//bool GetRandomString(CString & strRandom, CString & strMsg, long lLengthMin = 5, long lLengthMax = 20, long lCharMin = 'a', long lCharMax = 'z');bool CprjGetRandomStringTestDlg::GetRandomString(CString & strRandom, CString & strMsg, long lLengthMin, long lLengthMax, long lCharMin, long lCharMax){int i;char * pcharRandom;long lLength;char charRandom;//===============================================================================================if(lLengthMax < lLengthMin){strMsg = _T("lLengthMax can't be less than lLengthMin");return false;}else if(lLengthMin <= 0 || lLengthMax <= 0){strMsg = _T("lLengthMax and lLengthMin can't be less than or equal 0");return false;}//-----------------------------------------------------------------------------------------------if(lCharMax < lCharMin){strMsg = _T("lCharMax can't be less than lCharMin");return false;}else if(lCharMin <= 0 || lCharMax <= 0){strMsg = _T("lCharMax and lCharMin can't be less than or equal 0");return false;}//-----------------------------------------------------------------------------------------------//字符串长度范围 : 5 到 20(5 + (16 - 1)) 范围lLength = rand() % (lLengthMax - lLengthMin + 1) + lLengthMin;//+1 : 多分配一个，最后一个字符必须是 /0 结束pcharRandom = (char*)malloc(lLength + 1);memset(pcharRandom,0,lLength + 1);for(i = 0;i < lLength;i++){//字符范围: 97 到 122(97 + (26 - 1)) 范围 a - zcharRandom = rand() % (lCharMax - lCharMin + 1) + lCharMin;pcharRandom[i] = charRandom;}//-----------------------------------------------------------------------------------------------CString strTemp(pcharRandom);strRandom = strTemp;//-----------------------------------------------------------------------------------------------free(pcharRandom);strTemp.Empty();//-----------------------------------------------------------------------------------------------return true;}