Re: MRU problem - C / C++ / MFC Discussion Boards

Re: Database connection through MFC help

Mike Danberg20-Oct-03 6:16

20-Oct-03 6:16

Oops. I posted the wrong code. Sorry. That CDatabase database shouldn't be in there. I don't remember why I put it there, probably just so it would compile without a problem.

Anyway the code I had, uses a global variable, and it was crashing on close. Looked like this.

CDatabase database;

__declspec(dllexport) void Connect()
{
AFX_MANAGE_STATE(AfxGetStaticModuleState( ));

database.Open( "EmployeeManager" );
}

__declspec(dllexport) void Disconnect()
{
AFX_MANAGE_STATE(AfxGetStaticModuleState( ));

database.Close();
}

Mike

Help with some C

Sirrius19-Oct-03 11:05

Sirrius

19-Oct-03 11:05

I have some C code here, my teachers, that I'm trying to rifle through and figure out. I am confused on on line of it: The second line down is

*b = (int*) malloc ( n * sizeof(int));

does this mean a integer pointer that point to a memory location that is 4 times the size of an integer? Which would be then 16 bytes. So a int pointer that points to 16 bytes of vacant memory. Am I right, close or way off.

Please help. the code below is what it is out of.

Thanks for your help.

#include "stdio.h"

void ByteSwap4_c(int n, int *a);
void ByteSwap4_asm(int n, int *a);

void ByteSwap4(int n, int *a)
{
  int i;
  int *b = (int*) malloc ( n * sizeof(int));
  for (i=0; i<n; ++i) 
	  b[i]=a[i];

  ByteSwap4_asm(n,a);
  ByteSwap4_c(n,b);

  for (i=0; i<n; ++i) 
  {
    if (a[i] != b[i]) 
	{
      printf("a[%d] (0x%08X) != b[%d] (0x%08X)\n",i,a[i],i,b[i]);
      exit(1);
    }
  }

  free(b);
}

void test4(int n, int *a, int *b)
{
  int i;
  ByteSwap4(n,a);
  for (i=0; i<n; ++i) {
    if (a[i] != b[i]) {
      printf("a[%d] (0x%08X) != b[%d] (0x%08X)\n",i,a[i],i,b[i]);
      exit(1);
    }
  }
}

int main()
{
  static int a[4]={0x01020304, 0xa0b0c0d0, 0xabdcef12, 0x12345678};
  static int b[4]={0x04030201, 0xd0c0b0a0, 0x12efdcab, 0x78563412};

  test4(4,a,b);

  printf("all tests pass\n");
}

void ByteSwap4_c(int n, int *a)
{
  int i;
  for (i=0; i<n; ++i) 
  {
    /* byte swap a[i] */
    int tmp=a[i];
    int pmt;
    ((char*)(&pmt))[3]=((char*)(&tmp))[0];
    ((char*)(&pmt))[2]=((char*)(&tmp))[1]; 
    ((char*)(&pmt))[1]=((char*)(&tmp))[2];
    ((char*)(&pmt))[0]=((char*)(&tmp))[3];

    a[i]=pmt;
  }
}

Re: Help with some C

markkuk19-Oct-03 11:45

markkuk

19-Oct-03 11:45

The malloc() call allocates space for a table of n integers.

Re: Convert int to hexa

Alexander ^M.,19-Oct-03 10:26

Alexander ^M.,

19-Oct-03 10:26

noobie

Don't try it, just do it! Wink | ;-)

Re: MRU problem

Neville Franks19-Oct-03 9:45

Neville Franks

19-Oct-03 9:45

The first time when it does work look at the stack backtrace and follow the calls back the MRU code. Then set a breakpoint on the code that handles the users MRU file menu selection. Then pick another item from the MRU list and follow what happens when the first breakpoint is reached.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: MRU problem

YaronNir19-Oct-03 22:47

YaronNir

19-Oct-03 22:47

Hi,
thanks for the reply.

i am not sure i understand your comment. why does the OnOpenDocument method is not being called for the second time i am trying to open the same MRU?
do i need to set a flag or something?

thanks again

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: MRU problem

Neville Franks19-Oct-03 23:13

Neville Franks

19-Oct-03 23:13

YaronNir wrote:
why does the OnOpenDocument method is not being called for the second time i am trying to open the same MRU?

Good question.

YaronNir wrote:
do i need to set a flag or something?

No.

Set a breakpoint on CWinApp::OnOpenRecentFile() and see what is going wrong. It calls OpenDocumentFile() ....

Hope that helps.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: MRU problem

YaronNir19-Oct-03 23:25

YaronNir

19-Oct-03 23:25

Ok,

i got into the core of the code. look at this:

CDocTemplate::Confidence CDocTemplate::MatchDocType(LPCTSTR lpszPathName,
	CDocument*& rpDocMatch)
{
	ASSERT(lpszPathName != NULL);
	rpDocMatch = NULL;

	// go through all documents
	POSITION pos = GetFirstDocPosition();
	while (pos != NULL)
	{
		CDocument* pDoc = GetNextDoc(pos);
		if (AfxComparePath(pDoc->GetPathName(), lpszPathName))
		{
			// already open
			rpDocMatch = pDoc;
			return <big>yesAlreadyOpen</big>;
		}
	}

	// see if it matches our default suffix
	CString strFilterExt;
	if (GetDocString(strFilterExt, CDocTemplate::filterExt) &&
	  !strFilterExt.IsEmpty())
	{
		// see if extension matches
		ASSERT(strFilterExt[0] == '.');
		LPCTSTR lpszDot = _tcsrchr(lpszPathName, '.');
		if (lpszDot != NULL && lstrcmpi(lpszDot, strFilterExt) == 0)
			return yesAttemptNative; // extension matches, looks like ours
	}

	// otherwise we will guess it may work
	return yesAttemptForeign;
}

this method returns (as i looked at the break point) "yesAlreadyOpen"

that is why nothing happens for me....

i still think i need to set a flag or something....

can u help ???

thanks again

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: MRU problem

Neville Franks20-Oct-03 0:02

Neville Franks

20-Oct-03 0:02

Are you sure the document is actually being closed. It doesn't sound like it from what you're saying. Have a look at the pDoc that it is matching on. See if it has any views attached. I think there is a count you can see by looking at the CDocument. Or maybe you have other views besided the SDI view?

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: MRU problem

YaronNir20-Oct-03 0:14

YaronNir

20-Oct-03 0:14

I think you are right,

but what am i missing in the close documents???

this is the code for the close request, i differ between 2 things

void CMyDoc::OnCloseDocument() 
{
	((CMainFrame*)AfxGetMainWnd())->OnFileClose();

	if (((CMainFrame*)AfxGetMainWnd())->m_bCloseRequest)
		CDocument::OnCloseDocument();
}

this is what i do in CMainFrame::OnFileClose() :

void CMainFrame::OnFileClose() 
{
	CMCEditorView* pView = (CMyView*)GetActiveView();
	pView->ClearListCtrl();

	SetWindowText(_T("My application - Untitiled"));
}

i differ between a closing application request and closing document request....the latter is just initializing the list control i have and set the title to be "untitled" and the first close the application.....

what am i missing?

thanks for all the help so far...

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: MRU problem

Neville Franks20-Oct-03 2:16

Neville Franks

20-Oct-03 2:16

Doesn't it simply come down to how: m_bCloseRequest is set. I don't think this is part of MFC, so it is a variable you are managing.

I certainly think that having CMyDoc know about and access CMainFrame is not good design. It should be the other way around. ie. Code in CMainFrame should call whatever CMyDoc etc. functions necesessary.

End of another long day of coding, so you won't hear any more from me until tommorrow.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: MRU problem

YaronNir20-Oct-03 2:41

YaronNir

20-Oct-03 2:41

thanks for the design tip, i completely agree with you.

the m_bCloseRequest is something i manage.if i won't use a flag in the OnCloseDocument, then when i will choose from the menu 'File-->Close' the application will exit (i am using SDI).
that is why i needed that flag......

still i don't know how to solve my problem.....any other suggestions?

have a good night.....

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: MRU problem

Neville Franks20-Oct-03 21:16

Neville Franks

20-Oct-03 21:16

Hi Yaron,
I'm a little confused about what the problem is now. I suggest you start a new thread, which outlines the problem as you now know it.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Application does not terminating

csperber19-Oct-03 7:42

csperber

19-Oct-03 7:42

I have an MFC application (VC6) which does not close correctly. Its an doc/view application. When I exit application the window was closed, but the process was not terminated. In debugger I have to stop debugging. In taskmanager I can see my application that should be closed.

I have set some breakpoints but they never arrived. E.g. I try ExitInstance.

Any idea where I can looking for?

Re: Application does not terminating

Neville Franks19-Oct-03 9:47

Neville Franks

19-Oct-03 9:47

First if you are using W98 etc. I'd restart Windows. Then set a breakpoint on CMainFrame::OnClose() and try again.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: Application does not terminating

csperber20-Oct-03 8:30

csperber

20-Oct-03 8:30

Thanx for answer.

I have Win2000. After restart I have same behaviour.

I set a breakpoint on CMainFrame::OnClose(). This breakpoint was reached. I set breakpoint on ~CMainFrame. This breakpoint was reached too.

After stopping debugger and stepping through code I went into CWinThread::PumpMessage(). I had to break the debugger to leave the application.

Re: Application does not terminating

Anthony_Yio20-Oct-03 1:42

Anthony_Yio

20-Oct-03 1:42

Would it be because there are still some of your process's thread running somewhere?

Sonork 100.41263:Anthony_Yio

Re: Application does not terminating

csperber20-Oct-03 8:39

csperber

20-Oct-03 8:39

Thanx for answer.

There are threads. But what can I do?

Re: Application does not terminating

Anthony_Yio20-Oct-03 16:19

Anthony_Yio

20-Oct-03 16:19

Try to kill the threads by signaling a kill event (If you are using event to do multithread managemnent). But makesure you do not abort your main app thread before aborting the smaller one in order to do a proper clean up of your resources.

Sonork 100.41263:Anthony_Yio

Re: Application does not terminating

Mikey_E15-Nov-03 12:57

Mikey_E

15-Nov-03 12:57

I was having the exact same problem. But, my application doesn't have threads. I ran into it because I commented out the following line from my document OnCloseDocument() function:

CDocument::OnCloseDocument();

Since the CDocument base class OnCloseDocument wasn't being called, the document was being left out there still open and my app couldn't terminate.

Mike Ellertson

getting AutoDate

pnpfriend19-Oct-03 7:40

pnpfriend

19-Oct-03 7:40

Hi all, How can i tell if the cell contains the autodate?
I tried the following way and it didn't work..

<br />
CString cellPos;<br />
IndToStr(srIndex,scIndex,cellPos);<br />
Range aRange = asheet.GetRange(COleVariant((CString)cellPos),COleVariant((CString)cellPos));<br />
			<br />
VARIANT va = aRange.GetValue();<br />
			<br />
if(va.vt != VT_EMPTY )<br />
{<br />
   CString valStr(va.bstrVal);<br />
   if(va.vt == VT_DATE)<br />
  {					<br />
    MessageBox(valStr);	<br />
   }					<br />
}<br />

Java Applets (jar) in MFC resources application

Crercio O. Silva19-Oct-03 7:08

Crercio O. Silva

19-Oct-03 7:08

Hi,

I've been developing MFC (HTMLView) applications for quite sometime now. In order to reference the images and javascript .js file I used the res://app.exe/ protocol and it works just fine. In my last project I need to use a java applet library .jar but no matter what I try it doesn't work unless the java applet is in a webserver. I have used the following approaches:

- codebase file://C:/dir/file.jar => failed
- archive file://C:/dir/file.jar => failed

- codebase res://app.exe/file.jar => failed
- archive res://app.exe/file.jar => failed

- codebase http://webserver/file.jar => success
- archive http://webserver/file.jar => success

The question is: How can I use a java applet in an MFC application without using a webserver?

Thanks a lot for any lights on this.

Crercio O. Silva / DBTools Development
http://www.dbtools.com.br

Re: Java Applets (jar) in MFC resources application

Johnny ²19-Oct-03 21:47

Johnny ²

19-Oct-03 21:47

Not sure exactly what you are trying to do, but an applet must run within Java, whether thats from the command line or within an HTML page. Look at http://www.juicystudio.com/tutorial/html/object.asp for information on how to embed in HTML, and you will need to use the 'codebase' attribute to specify the jar file.

Re: Java Applets (jar) in MFC resources application

Crercio O. Silva20-Oct-03 2:21

Crercio O. Silva

20-Oct-03 2:21

Hi,

Thanks but I know how to embed the applet in my HTML page. As a matter of fact the problem only occurs when the applet is in the application resources like I can do with HTML pages, CSS files, GIF/JPG images, etc. Unfortunatelly it doesn't work with applets. Bellow you can see the part of the code I'm using to load the applet:

<applet code="SomeCtrl" width="350" height="250" name="myctrl"
="" archive="SomeCtrl.jar" viewastext="">

The thing is, if I use this code in a page in my webserver it works correctly since the jar is in the same directory as the page is. But I do wnat to load this applet from the application resources or externally using the file:///C:/folder/ protocol. I have tested the file:/// protocol and it works if the HTML page is on disk but in my case the HTML page is in the resource.

If it still not clear, please just let me know.

Thanks again,

Crercio O. Silva / DBTools Development
http://www.dbtools.com.br

Re: Java Applets (jar) in MFC resources application

Steve S20-Oct-03 2:23

Steve S

20-Oct-03 2:23

I think there's a res: protocol for loading stuff from resources.

Steve S

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.