Re: What's wrong with this code? - C / C++ / MFC Discussion Boards

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Re: Create Dll in VC++ for client that works in Delphi

Tim Deveaux2-Oct-01 9:52

Tim Deveaux

2-Oct-01 9:52

Maybe these will help: (?)

http://www.drbob42.com/delphi/headconv.htm

http://www.mindspring.com/~cityzoo/tips/loadlib.txt

Thank you !!

2-Oct-01 11:09

Multimedia Timer question

RobJones2-Oct-01 8:10

RobJones

2-Oct-01 8:10

Hello,
I am trying to implement a multimedia timer in my app.. So far I think most of what I have done is correct but I am having a few problems.. I have been refrencing http://www.codeproject.com/system/timers_intro.asp#MMTimers and it has helped out quite a bit.. Here is what I have implemented so far..

OnStart()
{
     .
     .
     .
     // Set resolution to the minimum supported by the system
     TIMECAPS tc;
     timeGetDevCaps(&tc, sizeof(TIMECAPS));
     DWORD resolution = min(max(tc.wPeriodMin, 0), tc.wPeriodMax);
     timeBeginPeriod(resolution);     

    // create the timer
    timeSetEvent(iS,resolution,TimerFunction,(DWORD)this,TIME_PERIODIC);


void CTimerDlg::MMTimerHandler(UINT nIDEvent)
{
	//decrement the count
	iS --;
	//format and display the count
	m_timer2.Display(iS,iM,iH,iD,(CString)m_strTimer2="%D:%H:%M:%S");		
}


void CALLBACK TimerFunction(UINT wTimerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
    // This is used only to call MMTimerHandler
    // Typically, this function is static member of CTimersDlg
    CTimerDlg* obj = (CTimerDlg*) dwUser;
    obj->MMTimerHandler(wTimerID);

}

When compiling I get a error that states "'timeSetEvent' : cannot convert parameter 3 from 'void (unsigned int,unsigned int,unsigned long,unsigned long,unsigned long)' to 'void (__stdcall *)(unsigned i
nt,unsigned int,unsigned long,unsigned long,unsigned long)'"

Anyone know what the problem may be?

Thanks again for helping out!
Rob

Never Mind

RobJones2-Oct-01 11:03

RobJones

2-Oct-01 11:03

I figured it out.

What's wrong with this code?

2-Oct-01 8:05

I just thought this code is correct, but my app crashes. Here it is:

void Log()
{
	FILE *log;
	if((log = fopen("C:\\foo.log","a+t")) == NULL)
		return;

	
         SYSTEMTIME systime;
	GetSystemTime(&systime);

        
         // log time and date in european or at least german format like 1.10.2001 20:00
	char text[128];
	sprintf(text,"%s.%s.%s\t%s:%s",systime.wDay,systime.wMonth,systime.wYear,systime.wHour,systime.wMinute);

         
         // should write "text" into logfile, but crashes at "fwrite" :confused:
	size_t len = strlen(text);
	fwrite(text,sizeof(char),len,log);
	fclose(log);
}

any help is apreciated

Re: What's wrong with this code?

C^hris L^osinger2-Oct-01 8:21

C^hris L^osinger

2-Oct-01 8:21

what is 'len' ? (0? 10,1000,000 ?)

any chance you've overrun the 128 characters? (use snprintf to be safe).

also, why not just use fprintf, instead or using a temp buffer ?

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: What's wrong with this code?

Tim Deveaux2-Oct-01 8:52

Tim Deveaux

2-Oct-01 8:52

Oops - the SYSTEMTIME members are WORDs, not char*...

Re: What's wrong with this code?

Rashid Thadha2-Oct-01 9:49

Rashid Thadha

2-Oct-01 9:49

Alternative that I use --

void LogAuditMessage(DWORD nThreadID, LPCSTR szfmt, ...)
{  
  va_list args;
  va_start(args, szfmt);
  
  static bool bCheckDone(false);
  if (!bCheckDone)
  {
    // now check to see if todays date directory exist YYMMDD
    SYSTEMTIME Current;
    GetLocalTime(&Current);
    
    strcpy(m_cDateFormat, "");	
    sprintf(m_cDateFormat, "%04d%02d%02d", Current.wYear, Current.wMonth, Current.wDay);
    
    // create the main directory, if it does not exist
    if (!FileExists(".\\Audit\\."))
      _mkdir(".\\Audit");
    
    bCheckDone = true;
  }
  
  char sBuff[100] = "";
  sprintf(sBuff, ".\\Audit\\%s.log", m_cDateFormat);
  
  // Write to the logging file
  FILE* f;
  
  char szBuf[1024];
  char cTimeBuff[50] = "";
  _strtime(cTimeBuff);
  
  _vsnprintf(szBuf, 1024, szfmt , args);
  va_end(args);
  
  f = _tfopen(_T(sBuff), _T("a"));
  if (f != NULL)
  {
    _ftprintf(f, _T("%08x, %s, %s\n"), nThreadID, cTimeBuff, szBuf);
    fclose(f);
  }  
}

CWinThread

kakuni2-Oct-01 5:44

kakuni

2-Oct-01 5:44

I am using CWinThread to process data. The processing is working great, but the graphs that I am loading don't display fast enough to keep up with the data processing. How can I get my thread to wait for the graphics to finish displaying??? right now I am using Sleep statements, but I know that this is not a good idea. Any advice is appreciated.

Thanks.

Re: CWinThread

Michael Dunn2-Oct-01 5:53

Michael Dunn

2-Oct-01 5:53

You can use the standard synch objects, probably an event would be the best for your situation. Look up CreateEvent() in MSDN, and go from there.

--Mike--
http://home.inreach.com/mdunn/
Heart | [heart]

your

with

and

Re: CWinThread

kakuni2-Oct-01 11:39

kakuni

2-Oct-01 11:39

Thanks for your reply... I have been messing around trying to get this to work with a CreateEvent, but I can't get it. Do you happen to have some example code, or know where I can find an example of this working. Thanks in advance.

Re: CWinThread

Michael Dunn2-Oct-01 17:46

Michael Dunn

2-Oct-01 17:46

Here's a CP search on "CreateEvent". You can also check the IPC section.

--Mike--
http://home.inreach.com/mdunn/
Heart | [heart]

your

with

and

window messages in com

Christer2-Oct-01 3:22

Christer

2-Oct-01 3:22

[client]->[com]->[DLL] function calls
[DLL]->[com] window message
[com]->[client] function retvals and events

I have a com object where i use loadlibrary,
i want to recive windows message to the com from the dll
is that possible?
Confused | :confused:

Christer

STLPort-4.5

Michael Martin2-Oct-01 2:35

Michael Martin

2-Oct-01 2:35

I am wondering if anyone has installed STLPort-4.5 on their VC++ installation?

I have downloaded it (after being introduced to it by Christian Graus) and read through the doco. If I want to use the iostream that comes with STLPort-4.5 I use installation method 1. If I don't want the iostream then I use method 2.

I am wondering what I lose/gain by using the STLPort-4.5 versions?

Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018

"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone

Re: STLPort-4.5

Jim Crafton2-Oct-01 3:13

Jim Crafton

2-Oct-01 3:13

>I am wondering what I lose/gain by using the STLPort-4.5 versions?
Are you talking in general or specific to the 4.5 version ?
I have been told by a friend who had installed it, that it is general a better version of STL implementation, and that it had a few extra's like hash_map and so on. As I recall I have also browsed the code and I remember thinking it was much more readable than the crap the comes with VC.

Re: STLPort-4.5

Michael Martin2-Oct-01 3:59

Michael Martin

2-Oct-01 3:59

I think I am talking about the iostream stuff that comes with 4.5. Also if I will break anything else in VC++ if I install it.

Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018

"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone

Re: STLPort-4.5

CodeGuy2-Oct-01 3:39

CodeGuy

2-Oct-01 3:39

Yes, it does better with compliance, although definitely not perfect. (Use C++ Builder or CodeWarrior for that. I don't even recommend GCC for compliance -- it fails for me on bitset operations.)

From what's been posted on the site, I hear the Dinkumware upgrade is better with VC, but I can't attest to this -- I got BCB for less than Dinkumware's STL upgrade.

CodeGuy

The WTL newsgroup: 940 members and growing ... http://groups.yahoo.com/group/wtl

What did I get in the call stack???

Chaos Lawful2-Oct-01 2:16

Chaos Lawful

2-Oct-01 2:16

When I was debugging a multi-threaded program, it generated a unhandled exception and I got the following call stack:

NTDLL! 77fcbaac()
KERNEL32! 77e665d6()
CNoTrackObject::operator new(unsigned int 4) line 84 + 12 bytes
CThreadLocal<_AFX_CTL3D_THREAD>::CreateObject() line 190 + 34 bytes
CThreadLocalObject::GetData(CNoTrackObject * (void)* 0x5f496dc0 CThreadLocal<_AFX_CTL3D_THREAD>::CreateObject(void)) line 404 + 3 bytes
CThreadLocal<_AFX_CTL3D_THREAD>::GetData() line 173 + 13 bytes
CThreadLocal<_AFX_CTL3D_THREAD>::operator _AFX_CTL3D_THREAD *() line 183 + 15 bytes
AfxInitThread() line 272 + 10 bytes
_AfxThreadEntry(void * 0x0235fc78) line 73
_threadstartex(void * 0x1ab86af8) line 212 + 13 bytes
KERNEL32! 77e6758a()

Could anyone tell me why it got into those functions? Confused | :confused:

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

Multiprocessor resources/Realtime

Stan the man2-Oct-01 2:05

Stan the man

2-Oct-01 2:05

Hi.

I was wondering if there are any sites or resources that talk about multiprocessor programming or has code snippets etc for this. With this, you should be able to get very close to semi hard realtime I am assuming. Does anyone also have any ideas of where to find any clues about writing somesort of driver or something that can constantly do lets say data acquisition and such at a hard realtime rate while the GUI works when it can?

Thanks

Just a question on WININET

Chaos Lawful2-Oct-01 2:05

Chaos Lawful

2-Oct-01 2:05

Here is a function:
void Foo(CFtpConnection *pFtpConnection)
{
CFtpFileFind finder(pFtpConnection);
CString currentDir;
BOOL bFlag=FALSE;
bFlag=finder.FindFile(NULL);
pFtpConnection->GetCurrentDirectory(currentDir);
while(bFlag) {
bFlag=finder.FindNextFile();
if(!finder.IsDots()) {
pFtpConnection->SetCurrentDirectory(finder.GetFileName());
pFtpConnection->SetCurrentDirectory(currentDir);
}
}
finder.Close();
}

When I call this function with a valid CFtpConnection object's address, will it generate some errors? If so, could you explain something to me? Confused | :confused:

Law is meaningless without chaos.
Chaos without Law is equal to destruction.
Chaos and Law create our rich and colorful world.

Getting rid of the title bar

Stan the man2-Oct-01 1:58

Stan the man

2-Oct-01 1:58

HI.

I have done everything I know of to try to get rid of the blasted title bar in a CFrameWnd derived Frame with CFormView views. I would think that if you get rid of the WS_CAPTION in the Precreatewindow that should do the job but nope. I also got rid of the MENU OK in there by setting it to NULL.

Any clues?

Re: Getting rid of the title bar

2-Oct-01 8:21

In the mainframes OnCreate() function :

ModifyStyle(WS_CAPTION,0,SWP_FRAMECHANGED); // removes title bar
ModifyStyle(0,WS_CAPTION,SWP_FRAMECHANGED); // brings it back

CListCtrl Refreshing

AJ1232-Oct-01 0:54

AJ123

2-Oct-01 0:54

Hi,

I have a CListCtrl, which doesn't seem to refresh properly. All is well until i call a dll which opens a window, when the window is moved over the CListCtrl it refreshes fine. But if the window is closed whilst covering the Clistctrl the covered region doesn't refresh. But all other controls seem to refresh fine under these circumstances

Cheers
Richard

Re: CListCtrl Refreshing

Tommy H D Svensson8-Nov-01 23:06

Tommy H D Svensson

8-Nov-01 23:06

Hi,

Did you come up with a solution to this problem cause I have reached the exact same situation?

/Tommy

serialization

2-Oct-01 0:51

I have declared the class CMyDoc like this :
"class CMyDoc : public COleServerDoc, public CMyClass"

Definition of class CMyClass :
"class CMyClass {
protected :
double mAge;
COtherClass mOtherClass; //(not derived from a CObject
class)
}"

the serialization of members like mAge works correctly, but when I want serialize class members like mOtherClass, the compiler send me the following error :
"error C2678: binary '<<' : no operator defined which takes a left-hand operand of type 'class CArchive' (or there is no acceptable conversion)".
How can serialize such members, must I make the class COtherClass serializable ?

thank in advance for your help.

Fred.

Fred

Last Visit: 31-Dec-99 18:00 Last Update: 17-Jun-24 14:48

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