Re: Destructing an exception - C / C++ / MFC Discussion Boards

Re: Help

Goh Hui Beng22-Feb-04 16:52

Goh Hui Beng

22-Feb-04 16:52

When I do what u suggest, I got error which says _T is not defined integer.

Re: Help

Steve S22-Feb-04 23:25

Steve S

22-Feb-04 23:25

Try adding

#include <tchar.h>

after the #include for windows.h

Steve S

Document/View Architecture - having 1doc and 2 Views

Ehsan Baghaki22-Feb-04 14:42

Ehsan Baghaki

22-Feb-04 14:42

i just want to know if this is possible to have another View Class in MDI and make some Child window that uses this View Class.

for example a list classes in a MDI:
CChildFrame
CMainFrame
CMyDoc
CMyView -> base class are CView
CMy2View -> i added this View Class that its base is not the same as CMyView base class and i want to have a Child Window that use this view class.

is this possible or any suggestion?

thanks in advance. Smile | :)

Re: Document/View Architecture - having 1doc and 2 Views

Ehsan Baghaki22-Feb-04 23:18

Ehsan Baghaki

22-Feb-04 23:18

i findout smthing, i have to set a Base class to both CMDIChildWnd and my own base class. and it seems that i have to Set BEGIN_MESSAGE_MAP(CMy2View, CMDIChildWnd)
is it true that the only way that a Child Window obey a View class is to make it with this line : CMDIChildWnd::Create(...)

So to having a ChildWindow i have to set base to CMDIChildWnd and then i will lose my own base class, i mean i cant use OnPaint() Coz i have to set Message map to CMDIChildWnd. Confused | :confused:

Any Suggestion ?

Parallel port & EPP

jane69smith22-Feb-04 12:14

jane69smith

22-Feb-04 12:14

I am working on an external device that I'm trying to interface through the parallel port. To get adequate speeds, I'm looking to use EPP instead of regular CENTRONICS. The problem is, I get the following output when I try to write to the port after negotiating the protocol.

<br />
Opening LPT1... OK<br />
Querying LPT1 Status...<br />
Status: 80<br />
Setting EPP Mode...<br />
Querying LPT1 Mode...<br />
Read Status: 40<br />
Write Status: 40<br />
Sending data...<br />
Error: Incorrect function.<br />
<br />
Sent 0 values<br />
Sending complete...<br />

The Read and Write status indicate that I've negotiated to EPP. However, I get the shown error. Here is the code snippet of what I'm doing

<br />
printf("Opening LPT1...\t");<br />
hParPort = CreateFile("LPT1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);<br />
<br />
printf("Querying LPT1 Status...\n");<br />
PAR_QUERY_INFORMATION ParInfo;<br />
DeviceIoControl(hParPort, IOCTL_PAR_QUERY_INFORMATION, NULL, 0, &ParInfo, sizeof(ParInfo), &ret, NULL);<br />
printf("Status: %x \n", ParInfo.Status);<br />
<br />
printf("Setting EPP Mode...\n");<br />
PARCLASS_NEGOTIATION_MASK parMode;<br />
PARCLASS_NEGOTIATION_MASK parModeBack;<br />
parMode.usReadMask = EPP_ANY;<br />
parMode.usWriteMask = EPP_ANY;<br />
DeviceIoControl(hParPort, IOCTL_IEEE1284_NEGOTIATE, &parMode, sizeof(parMode), &parModeBack, sizeof(parModeBack), &ret, NULL);<br />
printf("Read Status: %x \n", parModeBack.usReadMask);<br />
printf("Write Status: %x \n", parModeBack.usWriteMask);<br />
<br />
printf("Sending data...\n");<br />
<br />
if(!WriteFile(hParPort, data, 1, &ret, NULL))<br />
{<br />
    //--- Print FormatMessage(GetLastError()) ---<br />
}<br />
printf("Sent %d values \n", ret);<br />
printf("Sending complete...\n");<br />
CloseHandle(hParPort)<br />

Any ideas as to why I get an invalid function and what I can try instead of WriteFile?

Jane

How to determine whether master volume is enabled?

Artem Moroz22-Feb-04 11:48

Artem Moroz

22-Feb-04 11:48

I'm using class CVolumeOutMaster - it sets and gets master volume. The class could be found here: http://www.codeproject.com/audio/volumeclasses.asp

It determines the volume like this:

DWORD CVolumeOutMaster::GetCurrentVolume()
{
	if ( !m_bAvailable )
		return BAD_DWORD;
	MIXERCONTROLDETAILS_UNSIGNED* aDetails =  (MIXERCONTROLDETAILS_UNSIGNED*)malloc(m_nChannelCount*sizeof(MIXERCONTROLDETAILS_UNSIGNED));
	if ( !aDetails )
		return BAD_DWORD;
	MIXERCONTROLDETAILS ControlDetails;
	memset( &ControlDetails, 0, sizeof(MIXERCONTROLDETAILS) );
	ControlDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
	ControlDetails.dwControlID = m_dwVolumeControlID;
	ControlDetails.cChannels = m_nChannelCount;
	ControlDetails.cMultipleItems = 0;
	ControlDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED);
	ControlDetails.paDetails = &aDetails[0];
	MMRESULT mmResult = mixerGetControlDetails( (HMIXEROBJ)m_dwMixerHandle, &ControlDetails, MIXER_GETCONTROLDETAILSF_VALUE );
	DWORD dw = aDetails[0].dwValue;
	free( aDetails );
	if ( mmResult != MMSYSERR_NOERROR )
	{
		TRACE(".MasterOutputVolume: FAILURE: Could not get volume. mmResult=%d\n", mmResult );
		return BAD_DWORD;
	}
	return dw;
}

How to determine whether master volume is enabled or disabled?

Destructing an exception

Ravi Bhavnani22-Feb-04 10:57

Ravi Bhavnani

22-Feb-04 10:57

My app leaks a CArchiveException when an (expected) exception occurs. If I try to fix the leak by deleting the exception (using either [a] or [b]), the framework ASSERTs that the exception isn't ready for deletion. Any clues as to how I can fix the leak?

status = Success;
// CException* pExcToDelete = NULL;
try {
  if (pArchive->IsStoring())
     (*pArchive) << m_tmLogin;
  else
     (*pArchive) >> m_tmLogin;
}
catch (CException* pExc) {
  // pExcToDelete = pExc;
  // delete pExcToDelete;  <-- [a]
  status = Error;
}
// delete pExcToDelete;  <-- [b]
return (status);

Thanks,

/ravi

My new year's resolution: 2048 x 1536
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Re: Destructing an exception

Artem Moroz22-Feb-04 11:51

Artem Moroz

22-Feb-04 11:51

call pExc->Delete() inside catch block

Re: Destructing an exception

Ravi Bhavnani22-Feb-04 11:56

Ravi Bhavnani

22-Feb-04 11:56

Ahh... thanks! Rose | [Rose]

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

displaying in string in hex

lyn22-Feb-04 8:35

lyn

22-Feb-04 8:35

hello..
i want to display whatever user input in the edit box to hex with a click of a button.. i want to display the characters in ascii codes..
can someone teach me how to do it?
thankss Big Grin | :-D

~wilD cat~

Re: displaying in string in hex

Ehsan Baghaki22-Feb-04 14:53

Ehsan Baghaki

22-Feb-04 14:53

http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/Q_20645650.html

http://www.codeproject.com/cpp/data_conversions.aspby VGirish

hope this helps

Bitmap Operate On Window 98

Best Friend22-Feb-04 7:11

Best Friend

22-Feb-04 7:11

Who can help my for below this code it just can operate window 2000, Xp or above. Now my problem is how I can modify this code to operate on Window 98 because my PC is using Window98. OR you has any example like this.
if (nIDEvent == 1)
{
CBitmap m_bmp;
m_bmp.LoadBitmap(IDB_BITMAP1);
m_bitmap.SetBitmap(m_bmp);
KillTimer(2);
SetTimer(2, 500, 0);
}
else if (nIDEvent == 2)
{
CBitmap m_bmp;
m_bmp.LoadBitmap(IDB_BITMAP2);
m_bitmap.SetBitmap(m_bmp);
KillTimer(2);
SetTimer(1, 500, 0);
}

Thanks.

Re: Bitmap Operate On Window 98

Ryan Binns22-Feb-04 18:32

Ryan Binns

22-Feb-04 18:32

This code should work correctly on Windows 98. Is it working?

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Bitmap Operate On Window 98

Best Friend22-Feb-04 19:40

Best Friend

22-Feb-04 19:40

When I run this code on window 98 I press button 1 it will not come out any bitmap pictuce but when I run on Windows Xp it will come out the bitmap picture. So I don't know where my problem.

Re: Bitmap Operate On Window 98

sps-itsec4623-Feb-04 0:18

sps-itsec46

23-Feb-04 0:18

I really don't know if this could be the problem but perhaps give it a try:

Best Friend wrote:
...
else if (nIDEvent == 2)
{
    CBitmap m_bmp;
    m_bmp.LoadBitmap(IDB_BITMAP2);
    m_bitmap.SetBitmap(m_bmp);
    KillTimer(2);
    SetTimer(1, 500, 0);
}

I think it's better to make a KillTimer(1); before setting it again. Perhaps Win98 got a problem with this.

I don't know the structure of your application but for the timer1-branch I would also suggest to KillTimer(1); because you restart this timer in timer2-branch. So my solution would be:

if (nIDEvent == 1)
{
    CBitmap m_bmp;
    m_bmp.LoadBitmap(IDB_BITMAP1);
    m_bitmap.SetBitmap(m_bmp);
    KillTimer(1);  // Kill timer1
    KillTimer(2);  // Kill timer2
    SetTimer(2, 500, 0);  // Set timer2
}
else if (nIDEvent == 2)
{
    CBitmap m_bmp;
    m_bmp.LoadBitmap(IDB_BITMAP2);
    m_bitmap.SetBitmap(m_bmp);
    KillTimer(2);  // Kill timer2
    KillTimer(1);  // Kill timer1
    SetTimer(1, 500, 0);  // Set timer1
}

Regards, mYkel

Re: Bitmap Operate On Window 98

Best Friend23-Feb-04 4:15

Best Friend

23-Feb-04 4:15

It still can not popup the bitmap picture. I has to read the MSDN on that he say LoadBitmap need to Import library User32.lib.

Re: Bitmap Operate On Window 98

sps-itsec4623-Feb-04 8:22

sps-itsec46

23-Feb-04 8:22

I also looked up the method in MSDN but couldn't find anything that says something about linking to user32.lib. Anyway, I found two very interesting links for you which should solve your problem.

At first try this one:

PRB: CStatic::SetBitmap Doesn't Display Bitmap on Win NT 3.51
Last reviewed: July 10, 1997
Article ID: Q151378
<a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;151378">http://support.microsoft.com/default.aspx?scid=kb;en-us;151378</a>[<a target=_blank title='New Window' href="http://support.microsoft.com/default.aspx?scid=kb;en-us;151378">^</a>]

If that doesn't work either you have to do it like described here:

SAMPLE: Drawing a Bitmap in a Foundation Class Dialog Box
Last reviewed: October 23, 1998
Article ID: Q141863
<a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;141863">http://support.microsoft.com/default.aspx?scid=kb;en-us;141863</a>[<a target=_blank title='New Window' href="http://support.microsoft.com/default.aspx?scid=kb;en-us;141863">^</a>]

The latter is a little bit more complicated but it works to 100%. I use this way of painting bitmaps in lots of my projects Wink | ;)

Regards, mYkel

the windows interface

Anonymous22-Feb-04 4:56

Anonymous

22-Feb-04 4:56

why are windows in some softwares (which I think are written in delphi) like CONTEXT(the editor) or UMPS(8051 and other microcontrollers simulator) are very different to ones written in vcpp.

does different languages offer different ways to make a window look different.( i hope u understand this sentence)

Re: the windows interface

Irish_GUI22-Feb-04 7:10

Irish_GUI

22-Feb-04 7:10

different styles,

u can make VC windows look like VB form windows very easily

Microsoft Chart in Visual c++

krugger22-Feb-04 4:55

krugger

22-Feb-04 4:55

Hi
I badly need a chart within an application that i am building. It should accept values from the database and draw lines but however, i was faced with a major problem, LACK OF DOCUMENTATION. Can somebody, please, help me to implement a simple bar char in visual c++ 6.0.

Thank you for your precious help.

I really need this stuff quick.

Krugger

Re: Microsoft Chart in Visual c++

Ravi Bhavnani22-Feb-04 15:38

Ravi Bhavnani

22-Feb-04 15:38

Take your pick![^] Smile | :)

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

dialog parent window pointer

Irish_GUI22-Feb-04 4:10

Irish_GUI

22-Feb-04 4:10

hi,
im looking to get access to the data in the main parent window dialog from another dialog,

i need a pointer to the main window ?

can someone give me exact code,
as i asked this before and was given instructions and
not concencrate help

Re: dialog parent window pointer

J.B.22-Feb-04 4:42

J.B.

22-Feb-04 4:42

You can try with

AfxGetMainWnd()

Re: dialog parent window pointer

Irish_GUI22-Feb-04 5:22

Irish_GUI

22-Feb-04 5:22

that returns a pointer to desktop Frown | :-(

Re: dialog parent window pointer

Maximilien22-Feb-04 7:57

Maximilien

22-Feb-04 7:57

you need to pass the "main parent window" pointer to the other dialogs.

if you are creating the other dialogs from the parent dialog do something like :

{
  CAnotherDialog dlg;
  dlg.pParentDialog = this;
  dlg.DoModal();
}

Maximilien Lincourt
Your Head A Splode - Strong Bad

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