C / C++ / MFC Discussion Boards

DaveE9th9-Jul-03 21:28

9-Jul-03 21:28

I get the following message Rage when I run the code:

Compiling...
rage.cpp
C:\Program Files\Microsoft Visual Studio\MyProjects\Rage NSN Lookup\rage.cpp(22) : error C2065: 'strcmp' : undeclared identifier
Error executing cl.exe.
-----------------------------------------------------
it's this line below:

if(!strcmp(str, Info[i]))
-----------------------------------------------------

Rage NSN Lookup.exe - 1 error(s), 0 warning(s)

VC++ 6.0

Re: help with IF statement

Ted Ferenc9-Jul-03 21:45

Ted Ferenc

9-Jul-03 21:45

Look in the MSDN for strcmp you will see that it says it requires a header file, from memory string.h. Also you will see what, if any, extra libraries it requires.

Simply press F1 when you cursor is over the strcmp text in your file.

If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676

Re: help with IF statement

Rage9-Jul-03 21:51

Rage

9-Jul-03 21:51

Add

#include <string.h>

at the top of the file.

But this means the code you've posted did not compile, then ...

~RaGE();

Re: help with IF statement

DaveE9th9-Jul-03 21:54

DaveE9th

9-Jul-03 21:54

I forgot the "string.h" header include. I got your code to compile with no errors or warnings, BUT when I run the program, it hangs up with a warning that it couldn't write to memory. This occurs when I enter a "1" to continue searching. Any ideas?

Thanks much, Dave.

Big Grin | :-D

VC++ 6.0

Re: help with IF statement

Rage9-Jul-03 23:01

Rage

9-Jul-03 23:01

I would expect the way you handle the Info table to be the problem (I have actually never seen a table be initialised und used that way, but that's probably because I'm a poor programmer Blush | :O

). Try and debug the program to see where it asserts.

~RaGE();

Re: help with IF statement

DaveE9th10-Jul-03 7:26

DaveE9th

10-Jul-03 7:26

Thanks Rage, that while statement worked great...

The problem was that I needed to remove the "\n" from at the end of the cin<

The UINT range problem in MFC.

Kevein9-Jul-03 17:54

Kevein

9-Jul-03 17:54

Hi!
I created a standard MFC form view based program. And I want to control its scroll bar in my program.

In my program, I need the scroll bar's scrolling range from 0 to 299000.
In response of the message:

OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)

I find the nPos value range is 0 to 32xxx, which I belive is a 16 bit data type. (each time, when I scroll it right and it increses beyond 32xxx, it suddenly turns to 0 and starts again from 0).

Now, the problem comes: I use a int type counter to indicate where the scroll bar is and update its position (also update some other variables in my program). But since the nPos only has limited range, each time when I scroll greater than 32xxx, the OnHScroll returns me a wrong number and the scroll bar will not working properly.

Any idea of this?
Thanks. Smile | :)

Re: The UINT range problem in MFC.

Neville Franks9-Jul-03 18:04

Neville Franks

9-Jul-03 18:04

To use 32bit scroll values you need to use GetScrollInfo() and SetScrollInfo().

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

Re: The UINT range problem in MFC.

Kevein13-Jul-03 15:20

Kevein

13-Jul-03 15:20

Thanks a lot. Smile | :)

Just for those also interested it,

I get it done like this:

This method of extracting 32-bit scroll box positions works only in those scroll messages that are sent to a window when the user grabs the thumb and drags it. It is not possible to obtain 32-bit scroll box position in cases of programmatically sent SB_THUMBTRACK and SB_THUMBPOSITION scroll messages. First, the 32-bit information cannot be packed into the WPARAM of the messages because only the High Word contains the scroll position. Second, the nTrackPos member of the SCROLLINFO structure maintained for scroll bars cannot be set programmatically. Any calls to SetScrollInfo to set the immediate scroll positions are ignored by the operating system.
Sample Code
void CMyWnd::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
if(nSBCode == SB_THUMBTRACK || nSBCode == SB_THUMBPOSITION)
{
// First determine if the user scrolled a scroll bar control
// on the window or scrolled the window itself
HWND hWndScroll;
if ( pScrollBar == NULL )
hWndScroll = m_hWnd;
else
hWndScroll = pScrollBar->m_hWnd;

SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
info.fMask = SIF_TRACKPOS;
::GetScrollInfo(hWndScroll, SB_HORZ, &info);

nPos = info.nTrackPos;
}

//......
//......
}

I found this from here:
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q152/2/52.asp&NoWebContent=1

Auto Device Driver Installation..

Member 4048139-Jul-03 15:25

Member 404813

9-Jul-03 15:25

Hi..

Just wondering if there is a installation software like installshield which can automatically install an device driver(with inf file).

i have written a program which calls an SetupCopyOEMInf function from DDK. It works fine with win2000 and winxp but not with win98 and me..

thanks...

Re: Auto Device Driver Installation..

IceMatrix10-Jul-03 8:50

IceMatrix

10-Jul-03 8:50

do u really think this is your most important thing??
if your driver is not a WDM one, then you will have to write a second version only for 98/me.

Thread Programming & Matlab

samr679-Jul-03 14:50

samr67

9-Jul-03 14:50

Hi All,
Attached is a simple c++ code that is to be, after compilation, called from MATLAB. When the line "afxbeginthread" is removed every thing is ok. When the line is re-placed the code compile but does not execute. Any suggestions?

Regards
Sam, Melbourne

#include "c:\temp\stdafx.h"
#include "c:\temp\mex.h"

/********************************************************************/
UINT THREADD1(LPVOID pParam)
{
printf(" %10.1f\n", 5.5);

return 0;
}

/*********************************************************************/void init_rt_pars ( void )

{
printf(" %10.1f\n", 3.3);
}

/*********************************************************************//* The GateWay Routine */
/* /********************************************************************/
void mexFunction( int nlhs, mxArray *plhs[],
int nrhs, const mxArray*prhs[] )

{

/*************************************************************/ init_rt_pars();

AfxBeginThread(THREADD1,NULL);

init_rt_pars();

/*************************************************************/
return;

}

Re: Thread Programming & Matlab

Abbas_Riazi9-Jul-03 18:17

Abbas_Riazi

9-Jul-03 18:17

Try CreateThread and _beginThread!

A. Riazi

Re: Thread Programming & Matlab

samr679-Jul-03 19:08

samr67

9-Jul-03 19:08

Hi A. Riazi,
Many thanks for your reponse.

I have tried CreateThread with no success.

I have also eliminated MATLAB now (ie the function that initiates the thread is main() not mexFunction) and the problem is still there. Any further suggestions?

Regards,
Sam

Re: Thread Programming & Matlab

kochhar10-Jul-03 14:32

kochhar

10-Jul-03 14:32

Try replacing:

<br />
AfxBeginThread(THREADD1,NULL);<br />

with:

<br />
AfxBeginThread(THREADD1,NULL,0,0,0,NULL);<br />

fwrite error???

will13839-Jul-03 11:15

will1383

9-Jul-03 11:15

Why would this:

fwrite(dataPtr,sizeof(unsigned char),(sizeof(unsigned char)*datalength),filePtr);

ALWAYS return 0 byte written Confused | :confused:

I can open the file ok using

filePtr = fopen (DataFile,"wb");

but whenever I try to write the data down it fails.

Anyideas?

Thanks!

Re: fwrite error???

Led9-Jul-03 11:23

Led

9-Jul-03 11:23

are you sure your dataPtr is not NULL ?
(or 0 - whichever your prefer Smile | :)

)

Re: fwrite error???

will13839-Jul-03 11:26

will1383

9-Jul-03 11:26

lol

I just checked that and it seems my data pointer is not pointing to the right place. LOL. fix that and then try again.

Thanks. I might be back. $Shucks | :-\$

Re: fwrite error???

will13839-Jul-03 11:32

will1383

9-Jul-03 11:32

ok pointers are all correct now, data is where I need it to be. But still, no data being written when calling the fwrite.

Unsure | :~

Re: fwrite error???

Neville Franks9-Jul-03 12:14

Neville Franks

9-Jul-03 12:14

Did the file open succeed? If you look at the data buffer in the debugger is it what you expect? What does errno tell you? Why aren't you checking what fopen() and fwrite() return.

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

Re: fwrite error???

Mustafa Demirhan9-Jul-03 12:54

Mustafa Demirhan

9-Jul-03 12:54

Firstly, your code should be like this:

fwrite(dataPtr, sizeof(unsigned char), datalength, filePtr);

It does not make any difference in case of a char, but if you use integers for example, your code will try to write 4x4xdatalength = 16xdatalength bytes of data, instead of writing 4xdatalength bytes.

Anyway, apart from that be sure to check the datalength. Check out whether it is 0 or not.

If it still does not work, add the following line after writing to the file:

fflush (filePtr);

Mustafa Demirhan
http://www.macroangel.com
Sonork ID 100.9935:zoltrix

<nobr>They say I'm lazy but it takes all my time

Finally!

will138310-Jul-03 1:14

will1383

10-Jul-03 1:14

Ok,

I did finally find it. Turned out that my global datasize number was being clobbered all the time, aka ending in a data size of 0 to be written.

Thanks for all of your help! I REALLY appreciate it!

Woo HOO!!

Dan

Confused in abby

PJ Arends9-Jul-03 11:03

PJ Arends

9-Jul-03 11:03

Dear Forum,

Ok, this is really starting to bug me. Anybody have any idea why the 'TableName' is not being added to the string 'str', even though the 'TableName' seems to be valid as the watch window shows the correct value and the TRACE call does manage to successfully out put it?

for (std::vector<DFields *>::iterator it = pConfig->Samples.begin(); it != pConfig->Samples.end(); ++it)
{
    CString str = _T("");
    if (pConfig->IncludeComputer)
    {
        str += (*it)->ComputerName;
        str += _T(" : ");
    }
 
    if (pConfig->IncludeTable)
    {
        TRACE("*%s*\n", (*it)->TableName); // TableName successfully TRACEd
        str += (*it)->TableName;           // Why TableName not added to string????
        str += _T(" : ");
    }
 
    str += (*it)->SampleName;
 
    m_ListSelected.AddString(str);
}

After this function, 'str' is (sans quotes): "Barn 1 Feed : : Total Daily Feed"

and the TRACE output is: "*743 Daily*".

str should be: "Barn 1 Feed : 743 Daily : Total Daily Feed"

I have tried to do a rebuild all, exit dev studio and then rebuild all, even rebooted my computer. But still no luck. All I know is that I will probably see what I am doing wrong as soon as I hit the submit button Unsure | :~

[edit]
ComputerName, Tablename, and SampleName are all CStrings.
[/edit]

Signed
Confused in abby

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: Confused in abby

Led9-Jul-03 11:26

Led

9-Jul-03 11:26

I don't have a clue,
but have you tried casting the TableName to f.e. (char *) or something alike..?

I wouldn't be amazed if it was some sort of type-confusion..

Re: Confused in abby

PJ Arends9-Jul-03 11:32

PJ Arends

9-Jul-03 11:32

hmmm. That worked. wierd Confused | :confused:

Thanks a lot Big Grin | :-D

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

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