C / C++ / MFC

Re: Can't open more than 16 documents in my application

3-Jan-06 7:02

With that configuration I doubt very much that you are running out of memory. It could be a resources problem. Have you tried running task manager (taskmgr.exe) while your app is running? Keep an eye on CPU and memory usage, and also watch the number of handles, threads, user objects and GDI objects. If one or more of these get way overused that could be your problem.

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brdavid5-Jan-06 4:43

brdavid

5-Jan-06 4:43

Interesting.... when I reach the 14th or 15th document opened, the CPU usage goes right to 100%. Now it does this everytime a document opens however it goes down once the doc is fully opened. On the 15th doc it stays at 100% which makes sense why I can't run anything else.

I'll start checking a few things. Do you have any ideas yourself?

Thanks for the help thus far! Smile | :)

Re: Can't open more than 16 documents in my application

PJ Arends5-Jan-06 18:28

Re: Can't open more than 16 documents in my application

5-Jan-06 18:28

brdavid wrote:
On the 15th doc it stays at 100%

brdavid wrote:
Do you have any ideas yourself?

Infinite loop.

brdavid6-Jan-06 6:06

brdavid

6-Jan-06 6:06

okay... I think I'm on to something. Whenever I open a new document the cpu usage peaks, but then doesn't return back to a low number. In fact with each new doc the low value increases until I reach a 100%. Now apparently I can still open up documents but I have a feeling at some point I just hit the limit with whatever is eating up the CPU. I started eliminating logic from the main window, which are tabs with formviews until I got down to one tab. The application now opens up more documents than before and the CPU usage goes back down to under 5 and sometimes zero. So somewhere in my logic for the tabs I have in my main window is causing the problem. I'll give more information when I have it finally nailed.

Thanks for the help. Smile | :)

edit: I have isolated the issue, which makes this even more weird. It has to do with this call:

<br />
	pList->CreateEx(WS_EX_CLIENTEDGE, dwStyle, rect, this, IDC_ITEMLISTCONTROL);<br />

Here's the weird part. I set up the application so that I can control the number of times this value is called per document. If called once per document the cpu usage starts to increase the more documents I open until it peaks at 100%. This happens in a custom list ctrl. I have another control that uses the same CreateEx method that subclasses ListCtrl as well and I do not have this issue, so somewhere in this MyListCtrl is the issue which happens to be related to CreateEx().

Weird. Confused | :confused:

edit: update:

<br />
int CMyListCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)<br />
{<br />
	CListCtrl::OnCreate(lpCreateStruct);<br />
	//if (CListCtrl::OnCreate(lpCreateStruct) == -1)<br />
	//{<br />
	//	ASSERT(FALSE);<br />
		return -1;<br />
	//}<br />
<br />
	// When the CMyListCtrl object is created via a call to Create(), instead<br />
	// of via a dialog box template, we must subclass the header control<br />
	// window here because it does not exist when the PreSubclassWindow()<br />
	// function is called.<br />
<br />
	//SubclassHeaderControl();<br />
	//return 0;<br />
}<br />

in turning the OnCreate method into this the CPU usage stays low. When I return 0 like it should the CPU starts to increase upwards the more docs I add. This is becoming a rather difficult problem. Cry | :((

-- modified at 18:45 Friday 6th January, 2006

accessing non-static variables

tonyro2-Jan-06 13:37

tonyro

2-Jan-06 13:37

I'm trying to access a variable (this->number) from a separate function in a different file. Is there an easy way to do this, like using a global variable or passing the value between functions as one would in C? When I try to access the variable with namespace::functionname::variable, I get the following error message: error C2597: illegal reference to non-static member 'namespace::functionname::variable'. Any help would be greatly appreciated!

Re: accessing non-static variables

PJ Arends2-Jan-06 15:09

2-Jan-06 15:09

Have you looked up C2597 in MSDN[^]?
[quote]
To access the nonstatic member, you must create an instance of the class and use a member-access operator (. or ->).
[/quote]

FlashWindowEx

Dody_DK2-Jan-06 10:55

Dody_DK

2-Jan-06 10:55

Why I can't use the FlashWindowEx() with MFC based dialog...

it gives me that FlashWindowEx is not declared, any way to use it?

thanks in advance...

PJ Arends2-Jan-06 15:15

2-Jan-06 15:15

FlashWindowEx is declared in WinUser.h. If you open WinUser.h and do a text search for FlashWindowEx you will see that FlashWindowEx is wrapped in a pre-processor conditional statement "#if(WINVER >= 0x0500)". So to use FlashWindowEx you have to #define WINVER 0x0500 at the top of your stdafx.h file.

Dody_DK2-Jan-06 23:39

Dody_DK

2-Jan-06 23:39

the problem is I don't have FlashWindowEx in the WinUser.h

here is what I have

FlashWindow(<br />
    HWND hWnd,<br />
#if(WINVER >= 0x0500)<br />
    DWORD dwFlags);<br />
#else<br />
    BOOL bInvert);<br />
#endif<br />
<br />
#if(WINVER >= 0x0500)<br />
#define FLASHW_STOP         0<br />
#define FLASHW_CAPTION      0x00000001<br />
#define FLASHW_TRAY         0x00000002<br />
#define FLASHW_ALL          (FLASHW_CAPTION | FLASHW_TRAY)<br />
#define FLASHW_TIMER        0x00000004<br />
#define FLASHW_TIMERNOFG    0x0000000C<br />
#endif /* WINVER >= 0x0500 */

any help with it? thanks....

Gavin Taylor3-Jan-06 6:32

Gavin Taylor

3-Jan-06 6:32

You've probobly still got a REALLY old version of the platform SDK, you've got two options, either download[^] the latest version or access the FlashWindowEx function on the fly using GetProcAddress[^].

If you choose the later option, you'll need something like:

/* Taken from the MSDN website*/
typedef struct {
    UINT  cbSize;
    HWND  hwnd;
    DWORD dwFlags;
    UINT  uCount;
    DWORD dwTimeout;
} FLASHEXINFO, *PFLASHEXINFO;
	
#define FLASHW_STOP         0
#define FLASHW_CAPTION      0x00000001
#define FLASHW_TRAY         0x00000002
#define FLASHW_ALL          (FLASHW_CAPTION | FLASHW_TRAY)
#define FLASHW_TIMER        0x00000004
#define FLASHW_TIMERNOFG    0x0000000C
	
typedef BOOL (WINAPI *PSFLEX)(PFLASHEXINFO);
	
	
static PSFLEX pFlashWindowEx = NULL; // Pointer to actual function
static BOOL initFlash = FALSE; // Loaded status
	
BOOL uiFlashWindowEx( HWND hWnd, UINT uCount /* Flash Count */, DWORD dwFlags /* check SDK */ )
{
	if ( ! initFlash )
	{ // Not loaded yet
		HMODULE hDLL = NULL;
		hDLL = LoadLibrary( TEXT( "user32.dll" ) );
		if( hDLL )
		{
			pFlashWindowEx  = ( PSFLEX ) GetProcAddress( hDLL, "FlashWindowEx" );
			initFlash = TRUE; // Loaded OK
		}
	}
	
	if ( pFlashWindowEx == NULL ) 
		return FALSE; // Not Supported
	
	FLASHEXINFO fwi;
	ZeroMemory( & fwi, sizeof( FLASHEXINFO ) );
	fwi.cbSize = sizeof( FLASHEXINFO );
	fwi.dwFlags = dwFlags;
	fwi.hwnd = hWnd;
	fwi.uCount = uCount;
	fwi.dwTimeout = 0L;
	return pFlashWindowEx ( & fwi );
}

Once done, just use uiFlashWindowEx( hWnd, 3, FLASHW_TRAY ); or whatever

Gavin Taylor
w: http://www.gavspace.com

-- modified at 12:37 Tuesday 3rd January, 2006

Error reading from com port

Dody_DK3-Jan-06 7:47

Dody_DK

3-Jan-06 7:47

thanks alot, I download the last PSDK and linked the vc++ compilter to the new dorectories, and it works great now, thanks alot...

Tooltip on editbox

mehrdadov2-Jan-06 6:29

mehrdadov

2-Jan-06 6:29

Hi I want to show a tooltip on Editbox when my mouse cursor go on it.How can I do it?
I know CTooltipCtrl but I can't use it for editbox.

Agh

-- modified at 2:24 Tuesday 3rd January, 2006

Re: Tooltip on editbox

Ravi Bhavnani2-Jan-06 8:40

Ravi Bhavnani

2-Jan-06 8:40

Use a CToolTipCtrl[^].

/ravi

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nitgonz2-Jan-06 5:02

nitgonz

2-Jan-06 5:02

Hi,

I am receiving an error message CXX0030 when trying to a readfile off a com 1 port.

My code is

hCom = CreateFile( pcCommPort,
GENERIC_READ | GENERIC_WRITE,
0, // must be opened with exclusive-access
NULL, // no security attributes
OPEN_EXISTING, // must use OPEN_EXISTING
0, // not overlapped I/O
NULL);

if (hCom == INVALID_HANDLE_VALUE)
{
// Handle the error.
printf ("CreateFile failed with error %d.\n", GetLastError());

return ;
}

// Build on the current configuration, and skip setting the size
// of the input and output buffers with SetupComm.

fSuccess = GetCommState(hCom, &dcb);
if (!fSuccess)
{
// Handle the error.
printf ("GetCommState failed with error %d.\n", GetLastError());
return ;
}

//printCommState();
// Fill in DCB: 57,600 bps, 8 data bits, no parity, and 1 stop bit.

init_settings();
fSuccess = SetCommState(hCom, &dcb);
//printf ("SetCommState...\n");

if (!fSuccess)
{
// Handle the error.
printf ("SetCommState failed with error %d.\n", GetLastError());
return ;
}

fSuccess = GetCommState(hCom, &dcb);
if (!fSuccess)
{
// Handle the error.
printf ("GetCommState failed with error %d.\n", GetLastError());
return ;
}

//printCommState();

//printf ("Serial port %s successfully reconfigured.\n", pcCommPort);
res = GetCommTimeouts(hCom, &get_com_time_outs);

//print_com_timeouts();

res = SetCommTimeouts(hCom, &com_time_outs);
//printf("SetCommTimeouts...\n");
if(!res) printf("SetCommTimeouts failed...\n");
res = GetCommTimeouts(hCom, &get_com_time_outs);
read_bytes=0;
char *reply;
DWORD dwBytesTransferred;
DWORD dwCommModemStatus;

// Specify a set of events to be monitored for the port.
SetCommMask (hCom, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);

while (hCom != INVALID_HANDLE_VALUE)
{
// Wait for an event to occur for the port.
// WaitCommEvent (hCom, &dwCommModemStatus, 0);

// Re-specify the set of events to be monitored for the port.
SetCommMask (hCom, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING);

//if (dwCommModemStatus & EV_RXCHAR)
//{
// Loop for waiting for the data.
do
{
// Read the data from the serial port.
res = ReadFile(hCom, reply, 81, &dwBytesTransferred, 0);//ReadFile (hCom, &Byte, 1, &dwBytesTransferred, 0);

// Display the data read.
if (dwBytesTransferred > 0)
printf (reply);

} while (dwBytesTransferred == 1);
//}
}

void init_settings()
{
dcb.DCBlength = sizeof(DCB);
dcb.BaudRate = CBR_9600; // set the baud rate
dcb.fBinary = TRUE;
dcb.Parity = NOPARITY; // no parity bit
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDtrControl = DTR_CONTROL_ENABLE; //
dcb.fDsrSensitivity = FALSE;
dcb.fTXContinueOnXoff = FALSE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
dcb.ErrorChar = FALSE;
dcb.fNull = FALSE;
dcb.fRtsControl = RTS_CONTROL_ENABLE;
dcb.fAbortOnError = FALSE;
dcb.fDummy2 = 0;
dcb.wReserved = 0;
dcb.XonLim = 0;
dcb.XoffLim = 0;
dcb.ByteSize = 8;
dcb.StopBits = ONESTOPBIT; // one stop bit
dcb.XonChar = 0;
dcb.XoffChar = 0;
dcb.ErrorChar = 0;
dcb.EofChar = 0;
dcb.EvtChar = 0;
dcb.wReserved1 = 0;
}

Is there something I am missing for reading off the com port?

Thanks

krmed2-Jan-06 5:34

krmed

2-Jan-06 5:34

Several problem areas here...

char *reply;
DWORD dwBytesTransferred;
DWORD dwCommModemStatus;

// Specify a set of events to be monitored for the port.
SetCommMask (hCom, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);

while (hCom != INVALID_HANDLE_VALUE) 
{
// Wait for an event to occur for the port.
// WaitCommEvent (hCom, &dwCommModemStatus, 0);

// Re-specify the set of events to be monitored for the port.
SetCommMask (hCom, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING);

//if (dwCommModemStatus & EV_RXCHAR) 
//{
// Loop for waiting for the data.
do 
{
// Read the data from the serial port.
res = ReadFile(hCom, reply, 81, &dwBytesTransferred, 0);//ReadFile (hCom, &Byte, 1, &dwBytesTransferred, 0);

// Display the data read.
if (dwBytesTransferred > 0)
printf (reply);

} while (dwBytesTransferred == 1);
//}
}

First, char* reply is only a pointer to a single character but you're trying to read 81 characters - you need a larger buffer. This is your real problem area.

Second, while not your problem, dwBytesTransferred is not initialized - you should always initialize your variables.

Third, while (dwBytesTransferred == 1) should be changed - if successful in this case, it will be 81. Perhaps you should say:

while (dwBytesTransferred > 0);

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
<kmedcalf@ev1.net>
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

John R. Shaw2-Jan-06 19:26

John R. Shaw

2-Jan-06 19:26

krmed wrote:
char* reply is only a pointer to a single character...

A minor point here, char* reply does not point to a single character. It points to some unknown memory location, which the compiler thinks contains a character buffer.

INTP
Every thing is relative...

nitgonz3-Jan-06 2:55

nitgonz

3-Jan-06 2:55

Thanks,
It actually worked when I changed it from a char pointer to a char array. But why would it work in this case if the pointer and the array could mean the same thing?

krmed3-Jan-06 4:44

krmed

3-Jan-06 4:44

Using an array actually has memory allocated for the buffer, but the pointer is just a pointer - you have to allocate the memory yourself (and delete it when you are through.

Karl - WK5M
PP-ASEL-IA (N43CS)
<kmedcalf@ev1.net>
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

krmed3-Jan-06 4:43

krmed

3-Jan-06 4:43

Of course you are right. But then at my age I guess I'm allowed one brain fade after 11 consecutive days off!

Karl - WK5M
PP-ASEL-IA (N43CS)
<kmedcalf@ev1.net>
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193