C / C++ / MFC

30-Aug-07 21:18

use onchange event of the edit box.
in that box, keep scanning the string available in the edit box.
there if you find any un required character,
simply, update the edit box with a new string, which omits that character.
ultimately, you will get the output as if the un desired characters are not being taken by the control.

-- modified at 3:37 Friday 31st August, 2007

6Qing8830-Aug-07 21:31

6Qing88

30-Aug-07 21:31

Windows hooking mechnism may be desired to solve your problem.

Nishad S30-Aug-07 21:34

Nishad S

30-Aug-07 21:34

I am afraid that is bulky... since there are simple solutions.

- NS -

jhwurmbach30-Aug-07 21:34

jhwurmbach

30-Aug-07 21:34

Why?
Wouldn't subclassing be much easier?

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

jhwurmbach30-Aug-07 21:36

jhwurmbach

30-Aug-07 21:36

kiran.pinjarla wrote:
I wanto an edit box which takes only numbers and special character.

You can have a edit box that takes only numbers. No way of inserting "-1.0".
Useless crap. One of the larest omissions in the Windows GUI-classes.

For usable numeric edit fields, scan the "controls"-section of codeproject.

Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words

Anurag Gandhi30-Aug-07 23:41

Anurag Gandhi

30-Aug-07 23:41

Create a new class with base class CEdit and override the OnChar event handler.

void CharEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if ( (nChar >= 65 && nChar <= 90) || (nChar >= 97 && nChar <= 122))
{
MessageBeep ( 0 ) ;
return ;
}

CEdit::OnChar(nChar, nRepCnt, nFlags);
}

Thats it.

Anurag Gandhi.
http://www.softgandhi.co.nr
Life is a computer program and every one is the programmer of his own life.

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer31-Aug-07 0:05

31-Aug-07 0:05

Search for Masked Edit controls on CP, there are a bunch of articles doing subclassed edit controls to do what you want.

Iain.

WaitForSingleObject Not working.. Help Plzz

megha_gharote30-Aug-07 20:09

megha_gharote

30-Aug-07 20:09

Dear Friends,

Using a thread i m writting a file and i want to wait untill the file is written.
For this i have used WaitForSingleObject but its not working..
here is the code

MAIN FILE
pApp->m_hEvent = ::CreateEvent(NULL, FALSE, FALSE, "FileEvent");
pSLMDoc->UpdateJobOrderInfo(m_pJobOrderInfo);
WaitForSingleObject(pApp->m_hEvent, INFINITE);
if (file.Open(strFileName, CFile::modeRead, &e) == FALSE)
{
AfxMessageBox(e.m_cause);
}
UINT nRet = file.Read(pFileJobOrder, sizeof(FILE_JOBORDER));

IN THREAD FILE
CBackupFile file;
file.WriteFile(pDBJobOrder);
delete pDBJobOrder;
::SetEvent( ((CSLMApp*) AfxGetApp())->m_hEvent );
return;

It is not wating till the time file writing is going on. And then it will throw an error in file opening..

Can u plz help me.. if u need any more input plzz tell me Cry | :((

Megha

some more details required ot solve.

chandu00430-Aug-07 20:19

30-Aug-07 20:19

definitely, i can solve this coz, i also faced these such problems in past.
but please let me know the purpose and architecture of your program.

megha_gharote30-Aug-07 20:31

megha_gharote

30-Aug-07 20:31

In Main File
In my application on click of a button, i'l check if DB connection is there. if its not then
pApp->m_hEvent = ::CreateEvent(NULL, FALSE, FALSE, "FileEvent");
pSLMDoc->UpdateJobOrderInfo(m_pJobOrderInfo); //This fuction starts a thread to write a file.

In the thread File
CBackupFile file;
file.WriteFile(pDBJobOrder); //Calls a fuction to write a file
delete pDBJobOrder;
::SetEvent( ((CSLMApp*) AfxGetApp())->m_hEvent ); // Set the event
return;

I want to wait untill this thread executes.. but it is not happening...
Did u get my problem..

megha

chandu00430-Aug-07 20:39

30-Aug-07 20:39

you mean, you want to wait in the button till the thread comletes. am i right?

Mark Salsbery30-Aug-07 20:39

Mark Salsbery

30-Aug-07 20:39

Often, if you have/want to wait for another thread to execute, you don't need another thread.

If the creating thread can't continue executing until the second thread finishes, do you
really need another thread?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

solution

chandu00430-Aug-07 20:44

30-Aug-07 20:44

try to follow this algorithm.
int flag=0;//global variable
button code
{
pApp->m_hEvent = ::CreateEvent(NULL, FALSE,
FALSE, "FileEvent");
pSLMDoc->UpdateJobOrderInfo(m_pJobOrderInfo); //This
fuction starts a thread to write a file.
while(flag==0);//wait till flag is made 1.
}
thread code
{
//perform your writing here
then at the end of the thread, make flag=1;
}
}

Re: solution

megha_gharote30-Aug-07 21:07

megha_gharote

30-Aug-07 21:07

I tried this one
It is working.

Thank u

Re: solution

Nishad S30-Aug-07 21:11

Nishad S

30-Aug-07 21:11

If this is the solution, then what is the use of events... Laugh | :laugh:

- NS -

Re: solution

chandu00430-Aug-07 21:20

30-Aug-07 21:20

please rename this message subject by prefixing [solved] to the subject
thanx

JudyL_MD31-Aug-07 2:12

JudyL_MD

31-Aug-07 2:12

First, as Mark said, if the initiating thread has to wait for the second thread to finish, why bother with the second thread?

To answer your question, consider this from the MSDN description of CreateEvent:

If lpName matches the name of an existing named event object, this function requests the EVENT_ALL_ACCESS access right. In this case, the bManualReset and bInitialState parameters are ignored because they have already been set by the creating process<br />
<emphasis mine>

Since I don't see a CloseHandle anywhere, I bet you're reusing the event without resetting it's state. Try adding a ResetEvent function call before starting your secondary thread. OR Switch to an unnamed event - you don't need a named event since you reach back into the app to get the event handle in your secondary thread.

Judy

CFile

Try30-Aug-07 20:08

Try

30-Aug-07 20:08

I am using the following code (it's in MSDN)

HANDLE hFile = CreateFile(_T("C:\\MyFile.DAT"),
         GENERIC_WRITE, FILE_SHARE_READ,
         NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

   if (hFile == INVALID_HANDLE_VALUE)
      AfxMessageBox(_T("Couldn't create the file!"));
   else
   {
      // Attach a CFile object to the handle we have.
      CFile myFile(hFile);

      static const char sz[] = "Hockey is best!";

      // write string, without null-terminator
      myFile.Write(sz, lstrlen(sz));

      // We can call Close() explicitly, but the destructor would have
      // also closed the file for us. Note that there's no need to
      // call the CloseHandle() on the handle returned by the API because
      // MFC will close it for us.
      myFile.Close();
   }

But MyFile.Dat is displaying unreadable characters.
What's the problem?

chandu00430-Aug-07 20:15

30-Aug-07 20:15

why dont you try the same with FILE * fp instead.
that is very convinient.

Try30-Aug-07 20:21

Try

30-Aug-07 20:21

Same problem exist..

chandu00430-Aug-07 20:48

30-Aug-07 20:48

can you just send me the code snippet of that used with FILE * fp.
i can solve this problem.

Try30-Aug-07 20:53

Try

30-Aug-07 20:53

CFile cfile_object;
   cfile_object.Open( TEXT("d:\\New.txt"), CFile::modeCreate|CFile::modeWrite);
   char szSampleText[100];
   strcpy(szSampleText, "Sample Text for CFile Write function Example");
   cfile_object.Write (szSampleText,100); 
   cfile_object.Close();

I got this from www.codersource.net

chandu00430-Aug-07 21:02

30-Aug-07 21:02

you didnt get my point DumbDude
try using the following code.
FILE *fp;
char szSampleText[100];
fp=fopen("d:\\New.txt","w");
fprintf("%s",szSampleText);
fclose(fp);
this will definately work.

Mark Salsbery31-Aug-07 6:20

Mark Salsbery

31-Aug-07 6:20

Try

<font>CFile cfile_object;
   cfile_object.Open( TEXT("d:\\New.txt"), CFile::modeCreate|CFile::modeWrite);
   char szSampleText[100];
   strcpy(szSampleText, "Sample Text for CFile Write function Example");
   cfile_object.Write (szSampleText, <font color="Red">strlen(</font></font><font color="Red"><font><font>szSampleText</font></font></font><font><font color="Red">)</font>); 
   cfile_object.Close();</font>

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]