C / C++ / MFC

Re: Is it Posibble to multithread a for loop

23-May-09 11:49

As you've mentioned a 'for' loop, I think OpenMP[^] is probably the simplest first thing to investigate, as it's aimed at that sort of thing[^].

Here's a CP article[^]...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

ThatsAlok24-May-09 18:32

ThatsAlok

24-May-09 18:32

FISH786 wrote:
However I have that process in it's own worker thread. I was wondering if that can be further multithreaded?

Yes and No!, answer is based on software design, your company software architect can help in this case. It very difficult to answer this question from remote.

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
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Simulate Keypress on a window

nitin323-May-09 3:26

nitin3

23-May-09 3:26

hi,
i want to simulate a key press on a window.

eg: ive handle to the notepad window and i want perform "ctrl+s" on notepad.

how to do that, please help me

Thanks & Regards

Re: Simulate Keypress on a window

Stuart Dootson23-May-09 4:32

23-May-09 4:32

keybd_event[^] or SendInput[^]?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

MoveNext ( )

vital_parsley200023-May-09 0:58

23-May-09 0:58

I am deleting a record from the table and then using the MoveNext()fucntion to move to the next record in the recordset.Below is the code for that.
How do i do that using the code below ??

<pre>void CSimpdbView::OnRecordsDelete()
{
CSimpdbDoc* pDoc=GetDocument();
_CommandPtr pCmd;
pCmd.CreateInstance(__uuidof(Command));
_ParameterPtr paramIsbn;
CString strIsbn;

CEdit* pEdit = (CEdit*)GetDlgItem(IDC_ISBN);
pEdit->GetWindowText(strIsbn);
_bstr_t sqlQuery("DELETE FROM lib WHERE ISBN = ?");

int val = MessageBox("This deletes the record.Continue ?",NULL,MB_OKCANCEL);
if(val == IDOK)
{
try
{
pCmd->ActiveConnection = pDoc->m_pConnection;
pCmd->CommandText=sqlQuery;

paramIsbn = pCmd->CreateParameter("strIsbn",adVarChar,adParamInput,-1,vtMissing);
paramIsbn->Value = (_variant_t)strIsbn;
pCmd->Parameters->Append(paramIsbn);

pCmd->Execute(NULL,NULL,adCmdText);
MessageBox("Record Deleted !",NULL,MB_OK);
pRs->MoveNext(); //Should move to the next reccord !
}

catch(_com_error &e)
{
TRACE( "Error:%08lx.\n", e.Error());
TRACE( "ErrorMessage:%s.\n", e.ErrorMessage());
TRACE( "Source:%s.\n", (LPCTSTR) _bstr_t(e.Source()));
TRACE( "Description:%s.\n", (LPCTSTR)_bstr_t(e.Description()));
}
catch(...)
{
TRACE("\n****Unhandled Exception****\n");
}
}
}

Help Please . Confused | :confused:

Stuart Dootson23-May-09 1:55

23-May-09 1:55

What's wrong with the recordset's Delete method[^]? (Well, possibly this[^], it's something you need to check).

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

vital_parsley200023-May-09 2:26

23-May-09 2:26

OMG!!

I m sorry i forgot to add the question to the post!!

Well, in the above code i m able to delete the record but i want it to show the next record once the record is deleted.For which i m using the pRs->MoveNext() method.
What i want to know is how do i do this ??

Stuart Dootson23-May-09 3:13

23-May-09 3:13

I think using the Delete method of the Recordset allows you to do just that without needing to worry about delete commands or anything like that. I guess you just need to open the recordset as read-write? This page[^] may provide more reassurance about that.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

vital_parsley200023-May-09 4:11

23-May-09 4:11

But isnt there a way where i could delete the record using sql query and then move to the next record and show it on GUI ? Confused | :confused:

Stuart Dootson23-May-09 4:24

23-May-09 4:24

I've just looked at your code properly - I presume pRS is a member of a class somewhere whose cursor points at the current record that a) you're displaying, and b) you want to delete?

If so, then this should work:

void CSimpdbView::OnRecordsDelete() 
{
   int val = MessageBox("This deletes the record.Continue ?",NULL,MB_OKCANCEL);
   if(val == IDOK)
   {
      try
      {
         pRs->Delete(adAffectCurrent);
         MessageBox("Record Deleted !",NULL,MB_OK);
         pRs->MoveNext(); //Should move to the next reccord !
      }

      catch(_com_error &e)
      {
         TRACE( "Error:%08lx.\n", e.Error());
         TRACE( "ErrorMessage:%s.\n", e.ErrorMessage());
         TRACE( "Source:%s.\n", (LPCTSTR) _bstr_t(e.Source()));
         TRACE( "Description:%s.\n", (LPCTSTR)_bstr_t(e.Description()));
      }
      catch(...)
      {
         TRACE("\n****Unhandled Exception****\n");
      }
   }
}

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

vital_parsley200023-May-09 4:46

23-May-09 4:46

In my code i deleted the record using sql query as you can see,and i have declared :

ResultsetPtr pRs;

in the View.h file.So it is globally accessible.So in that case (making changes to the code you gave),i have to call the sql query

select * from lib_details where ISBN = ? ;

and then insert the parameter using command object and append function
and then call pRs->Open()
and then pRs->Delete(adAffectCurrent);
and then pRs->MoveNext(); //as you have mentioned in your code

I hope what i have mentioned is right.

But instead of this can i delete the record using sql query and then move to the next record ? if this is possible how can it be done ? and i guess it would be easier . Blush | :O

Stuart Dootson23-May-09 5:04

23-May-09 5:04

vital_parsley2000 wrote:
But instead of this can i delete the record using sql query and then move to the next record ?

The term 'next record' has no meaning unless you've selected a bunch of records into a recordset. What I thought you had done (and would suggest you do) is select the records you are interested in (using a SELECT statement) into a record-set. Then the user can delete a record if they choose to (using the record-set's delete method, as I showed you) and you can move on to the record-set's next record. The record-set would be declared at class scope, so it is persistent across event handlers. Something like this (obviously this is a bare-bones sketch of what you'd use):

class MyDoc
{
   // other declarations
   _RecordsetPtr pRs;
  void SelectRecords(parameters) { /* create and initialise record-set */ }
};

class MyView
{
   void DisplayRecord() { /* Display the current record in GetDocument()->pRs; }
   void OnNextRecordButtonPressed() ( GetDocument()->pRs->MoveNext(); DisplayRecord(); }
   void OnDeleteRecordButtonPressed() ( GetDocument()->pRs->Delete(adAffectCurrent); OnNextRecordButtonPressed(); }
};

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

[Message Deleted]

vital_parsley200024-May-09 21:07

24-May-09 21:07

[Message Deleted]

Stuart Dootson25-May-09 0:40

25-May-09 0:40

If the objcore.cpp in your MFC is like mine, you've got a bad object somewhere. Look at a) what the assertion in objcore say, b) which of your objects it is acting on, c) the call stack - that will show where in your program the assertion originates.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

vital_parsley200025-May-09 5:09

25-May-09 5:09

Thanx for ur replies.Appreciate your help Big Grin | :-D

CueBanner in vc6

ganesh.dp23-May-09 0:49

ganesh.dp

23-May-09 0:49

how can i add "cue banner" facility to cedit in vc++ 6.0

Re: CueBanner in vc6

Stuart Dootson23-May-09 1:51