I am recording to current time, and compare with the old time which stored in a file. but here t4 is always one digit less. for example, when I check file end.txt and start.txt, t4 is 22284, and t3 is 21975, no problem. but when I calculate and output differ, it shows 2228-21975=-19747. t4 is wrong! what is the problem here? int differ=0; // int old_time=0; int t3=0; int t4=0; time_t t1,t2; FILE * pFile; (void) time(&t2); // record the current time t4=(int)t2; pFile = fopen ("/root/pclinq/end.txt","r+"); fprintf (pFile, "%d",t4); //save the current time to the file fclose (pFile); pFile = fopen ("/root/pclinq/start.txt","r+"); fscanf (pFile, "%d", &t3); //dig out the old time saved fclose (pFile); differ=t4-t3; printf("differ is %d-%d=%d\n",t4,t3,differ); (solved)it turns out the last digit was a remaining one, for example,2228 is the real number recorded this time -- modified at 8:51 Tuesday 17th July, 2007

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I had been used multithread, and it works strange. It works fine when I run the program at foreground, the first thread keeps running while the second thread waiting for input. But it does not work well when I run it at background. Without any inputs, both the first and second threads will stop. Only after I manually switching it back to run at foreground, then the first thread runs again. So I really want to find something similar and simpler than the mulithread way.

not necessarily a single function, but with the usage: keep program running, while accept the input if any

if I am using getchar(), then the execution of the program will stop here if no input is given. could someone help me figure out if there is another way? Aim: while any input is given, save it to a variable, if not, keep on executing program without stop. I have used multithread, but it did not work well when I put it running at background. I am using C

if I am using getchar(), then the execution of the program will stop here if no input is given. could someone help me figure out if there is another way? Aim: while any input is given, save it to a variable, if not, keep on executing program without stop. I have used multithread, but it did not work well when I put it running at background. I am using C

errr.... I am only using C, so could you give me some information related to it?

thank you for reply. 1.I guess it does not have much thing to do with the platform. 2.Regarding to the parameters of pthread, I took reference from here http://www.yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html#BASICS it looks working fine, at least as I said when executing it at the foreground, but because I can open only one terminal, probably have to do several things, so I can only put it running at the background, there problems occurs.

the scenario is I am counting down 5, if no 'y' has been input during this time, then it ends at one way, else it ends at another way. Because I dont expect there must be a 'y' input, I write this as multi-thread, one for counting down, one for checking the 'y' input (could be unnecessary). this program works fine when I put it at the foreground(using linux), but when put it at background, error happens, it will stop and wait for getchar() input, and m doesnot count down. As long as I use shell command "fg" to bring it back to foreground, the count down resumes, but that is not what I want. what I want is just: put the program execution at background, while waiting for a 'y' input during 5 seconds count down time. void *countdown( ); void *waitinput( ); static int m=5; static int k=1; int main(int argc, char **argv) { pthread_t thread1=0, thread2=0; int iret1=0, iret2=0; /* Create independent threads each of which will execute function */ iret1 = pthread_create( &thread1, NULL, countdown, NULL); iret2 = pthread_create( &thread2, NULL, waitinput, NULL); /* Wait till threads are complete before main continues. Unless we */ /* wait we run the risk of executing an exit which will terminate */ /* the process and all threads before the threads have completed. */ pthread_join( thread1, NULL); // pthread_join( thread2, NULL); pthread_cancel(thread1); pthread_cancel(thread2); printf("pthread been cancelled\n\n"); if(k=1){...} else {...} return 0; } void *countdown() { while(m>0) { printf("%d seconds left\n",m--); sleep(1); printf("m is %d\n",m); } } void *waitinput() { char c='n'; while(m) { if((c=getchar())=='y') { printf("congratulations. you entered y\n"); sleep(1); m=0;k=0; } else ; } }

the scenario is I am counting down 5, if no 'y' has been input during this time, then it ends at one way, else it ends at another way. Because I dont expect there must be a 'y' input, I write this as multi-thread, one for counting down, one for checking the 'y' input (could be unnecessary). this program works fine when I put it at the foreground(using linux), but when put it at background, error happens, it will stop and wait for getchar() input, and m doesnot count down. As long as I use shell command "fg" to bring it back to foreground, the count down resumes, but that is not what I want. what I want is just: put the program execution at background, while waiting for a 'y' input during 5 seconds count down time. void *countdown( ); void *waitinput( ); static int m=5; static int k=1; int main(int argc, char **argv) { pthread_t thread1=0, thread2=0; int iret1=0, iret2=0; /* Create independent threads each of which will execute function */ iret1 = pthread_create( &thread1, NULL, countdown, NULL); iret2 = pthread_create( &thread2, NULL, waitinput, NULL); /* Wait till threads are complete before main continues. Unless we */ /* wait we run the risk of executing an exit which will terminate */ /* the process and all threads before the threads have completed. */ pthread_join( thread1, NULL); // pthread_join( thread2, NULL); pthread_cancel(thread1); pthread_cancel(thread2); printf("pthread been cancelled\n\n"); if(k=1){...} else {...} return 0; } void *countdown() { while(m>0) { printf("%d seconds left\n",m--); sleep(1); printf("m is %d\n",m); } } void *waitinput() { char c='n'; while(m) { if((c=getchar())=='y') { printf("congratulations. you entered y\n"); sleep(1); m=0;k=0; } else ; } }

I know how to read string values from Access db, like: CString strFields[5]; COleVariant varstring for(field=0; field<5;field++) { recordset.GetFieldValue(field, varstring); strFields[field]=V_BSTRT(&varstring); } then the string value from db. goes into strFields But what if I know the strFields, and want write to update the db. Does anyone know the adverse procedure?

I know how to read string values from Access db, like: CString strFields[5]; COleVariant varstring for(field=0; field<5;field++) { recordset.GetFieldValue(field, varstring); strFields[field]=V_BSTRT(&varstring); } then the string value from db. goes into strFields But what if I know the strFields, and want write to update the db. Does anyone know the adverse procedure?

I am a new learner to the Dao database operation through MFC access.For now I am trying to write a program, saving two values in two edit boxes to a column of MS Access 2000 table. There are not many samples available. Could any one write little sample codes or guide me to a tutorial. The msdn explanation seems a bit difficult and abstract for me.

string strd1 = "9"; int m=atoi(strd); Got the error: error C2664: 'atoi' : cannot convert parameter 1 from 'class std::basic_string,class std::allocator >' to 'const char *' how to change the second line to make it work?

if I have three words in there lines in a .txt file, and I want to read them to three string, how to do this using c++ ifstream? how to read every line(word)?

I am using C++ in VC++ 2003 there are some examples like this http://www.codeproject.com/cpp/miniexcel.asp but I don't quite understand. I hope someone could help me or guide me to some related documents, bow!

I am using the MFC dialog application. There are 3 edit box, add1, add2 and sum and a button "add", when exectuing, I input add1, add2, and use the "add" function dlg.m_sum=dlg.m_add1+dlg.m_add2 how to make the sum appears in the "sum" edit box? Do I have to add a view class or how to modify the OnPaint? I now only have add.cpp and addDlg.cpp

I am using the MFC dialog application. There are 3 edit box, add1, add2 and sum and a button "add", when exectuing, I input add1, add2, and use the "add" function dlg.m_sum=dlg.m_add1+dlg.m_add2 how to make the sum appears in the "sum" edit box? Do I have to add a view class or how to modify the OnPaint? I now only have add.cpp and addDlg.cpp

do you mean both these two ways are ok? which would you prefer here?

sorry, what is that mean? could you explain it a little detailed? what is the difference if I had not use it?