I have coded the following: --------------------------------------------- //file BT01.h class BT01 { public: int BruteForce(char *P, char *T); void InputText(char *T, char *P); }; --------------------------------------------------- //file BT01.cpp #include "BT01.h" #include "time.h" #include "dos.h" #include <iostream> #include <conio.h> #include <stdio.h> using namespace std; int BT01::BruteForce(char *P, char *T) { //duyet T for (int i = 0; i <= strlen(T) - strlen(P); i++) { //khai bao j int j = 0; //duyet P while (j < strlen(P)) { //Kiem tra ptu tai T tai vi tri thu i + j co bang j hay khong? xu ly if (tolower(T[i + j]) == tolower(P[j])) j++; else break; } //Tim thay if (j == strlen(P)) return i; } //khong tim thay return -1; } void BT01::InputText(char *T, char *P) { do{ printf("T: "); gets(T); } while (strlen(T) < 1); do{ printf("P: "); gets(P); } while(strlen(P) < 1 || strlen(P) > strlen(T)); } void main() { char *P = new char[20]; char *T = new char[999]; printf("BAI TAP TH01 - THUAT TOAN BRUTEFORCE\n"); BT01 objBT01; objBT01.InputText(T, P); int kq; kq = objBT01.BruteForce(P, T); if (kq == -1) printf("KQ: Khong tim thay."); else printf("\nKQ: %i, %i", kq, strlen(T)); printf("\nThoi gian (ms): "); getch(); } I would like to count time for Algorithm BruteForce. How to count?

modified on Monday, December 22, 2008 11:00 PM

Ok. Thank you for your help. See u later.

Sorry! It is not contain mUti. It correct: DataTable lTbl = PGetDataTable(mConnectString, mStrSQL, "tbl");

v: express variable of method l: local in method. vStrSQL = "select * from User where user = 'aaa' and passwd = 'bb'; I tested vStrSQL on MS Access. It is true. It used folow: vStrSQL = "select * from User where User = '" + txtUser.Text + "' and Passwd = '" + txtPassword.Text + "'"; DataTable lTbl = mUti.PGetDataTable(mConnectString, mStrSQL, "tbl"); //// Error ... System.Data.OleDb.OleDbException: Syntax error in FROM clause. at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

vConn is string: @"Provider = Microsoft.Jet.OLEDB.4.0; Data source = Dat.mdb"; I code like that. So, I want to build Library for Access.

I coded folowing: public void PWriteToEventLog(Exception ex) { EventLog lLog = new EventLog(); lLog.Source = "Data Access Error... "; lLog.WriteEntry(ex.Message.ToString()); } public DataTable PGetDataTable(string vConn, string vStrSQL, string vTableName) { //variable to return DataTable lDataTable; //variable to process OleDbConnection lConn = new OleDbConnection(vConn); OleDbCommand lComm = new OleDbCommand(vStrSQL, lConn); OleDbDataAdapter lAdapter = new OleDbDataAdapter(); try { lConn.Open(); lAdapter.SelectCommand = lComm; } catch (Exception ex) { this.PWriteToEventLog(ex); throw new Exception("Error from [PGetDataTable]\n" + ex.ToString()); } try { lDataTable = new DataTable(vTableName); lAdapter.Fill(lDataTable); lConn.Close(); } catch (Exception ex) { this.PWriteToEventLog(ex); throw new Exception("Error ... \n" + ex.ToString()); } return lDataTable; } When I run. It notice bug: Unhandle exception has your occured in your application. Error... system.data.oledbexception: sysntax error in from Clause.