hi there, I have compiled a string table and some of the strings I need to assign to a char* variable, how can I do it? Thanks Jim

Hi there, I have in my application a button that launches another application such as the on-screen keyboard using the createprocess function. If the button is pressed again I want to close the application. How can I do this safely? Many thanks Jim

Hi all, Within my application I have a button that launches the windows XP OSK which works fine. The problem lies in the fact that this application is to operate on a touchscreen and being fullscreen restricts the user from accessing the taskbar. If the user minimises the OSK I cannot get it back without closing the application to gain access. So my question is this, can I get the status of the OSK, that is, minimised, running etc? so I can maximise it again from my application? The button in my application at the moment just opens the OSK but if it is already open (minimised) I cannot get it back..... Hopefully someone can help with this? Cheers Jim :confused:

Hi Cedric, Thanks for your help, that worked straight away.....I realised I had not set the timeouts :doh: Jim

Hi All, I wondered if someone can shed some light on what might be going on here. I have created the worker thread (code below) and when my system first boots up and I run through debug I find that the thread doesn't fire off the PostMessage(UWM_DATA_READ) until the buffer is full up....what I want it to do is fire it off when ever it reads in something. The interesting part is that if I stop the application and open Hyperterminal on the same com port then close it and then rerun the application it works as I intended???? Does anyone have any ideas what is going on?????? Cheers Jim

UINT CMyDlg::monitorThread(LPVOID pParam)
{
DWORD dwRead;
DWORD dwRes;
BOOL fWaitingOnRead = FALSE;
OVERLAPPED osReader = {0};
struct PTZCommStruct *pPTZStruct = (struct PTZCommStruct *)pParam;

// Create the overlapped event.
osReader.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

if(osReader.hEvent == NULL)
{
	// Error creatiing overlapped event, abort.
	DWORD err = ::GetLastError();
	pPTZStruct->pWnd->PostMessage(UWM\_READER\_SHUTTING\_DOWN, (WPARAM)err);
	return 0;
} 


while(pPTZStruct->nPTZCommTerminate == 0)
{
	if(!fWaitingOnRead)
	{
		// Issue read Operation.
		BOOL tmp = ReadFile(m\_hPTZCtrlPort, PTZbuffer, MAX\_BUFFER\_SIZE, &dwRead, &osReader);
		if(!tmp)
		{
			if(GetLastError() != ERROR\_IO\_PENDING) // read not delayed
			{
				// Error in comms - report!!!
				return 0;
			}
			else
			{
				fWaitingOnRead = TRUE;
			}
		}
		else
		{
			// \*\*\*Read the data
			pPTZStruct->pWnd->PostMessage(UWM\_DATA\_READ);
		}
	}
	else
	{
		dwRes = WaitForSingleObject(osReader.hEvent, READ\_TIMEOUT);
		switch(dwRes)
		{
			// Read Completed
		case WAIT\_OBJECT\_0:
			if(!GetOverlappedResult(m\_hPTZCtrlPort, &osReader, &dwRead, FALSE))
			{
				DWORD dwError = GetLastError();
				switch(dwError)
				{
					case ERROR\_HANDLE\_EOF:
						return 0;
						break;
					case ERROR\_IO\_PENDING:
						return 0;
						break;
					case ERROR\_IO\_INCOMPLETE:
						return 0;
						break;
					case ERROR\_OPERATION\_ABORTED:
						return 0;
						break;
					default:
						// error in comms - report
						Dump1("Serial Read Error %d\\r\\n", ::GetLastError());
						return 0;
						break;
				}
			}
			else
			{
				// \*\*\*Read the Data 
		        pPTZStruct->pWnd->PostMessage(UWM\_DATA\_READ);
			}
			fWaitingOnRead = FALSE;
			break;

		case WAIT\_TIMEOUT:

Hi there, I have created a thread that just monitors the serial port, but as soon as the com port receives any data, the GetOverlappedResult issues an ERROR_OPERATION_ABORTED error. Please can you take a look at my code, I cannot see what is going on. Thanks Jim :confused:

#define READ_TIMEOUT 500 // Milliseconds

UINT CPageOneDialog::monitorPTZThread(LPVOID pParam)
{
DWORD dwRead, dwRes;
BOOL fWaitingOnRead = FALSE;
OVERLAPPED osReader = {0};
char ptzControlCommPort[14];
struct PTZCommStruct *pPTZStruct = (struct PTZCommStruct *)pParam;

// Open the comm port.
sprintf(ptzControlCommPort,"\\\\\\\\.\\\\COM%d",PTZCTRLPORT+1);
pPTZStruct->hPTZSerial = CreateFile( ptzControlCommPort,
			  GENERIC\_READ | GENERIC\_WRITE,
			  0,    // must be opened with exclusive-access
			  NULL, // no security attributes
			  OPEN\_EXISTING, // must use OPEN\_EXISTING
			  FILE\_FLAG\_OVERLAPPED,    // overlapped I/O
			  NULL  // hTemplate must be NULL for comm devices
			  );


// Create the overlapped event.
osReader.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

if(osReader.hEvent == NULL)
{
	// Error creatiing overlapped event, abort.
	pPTZStruct->pWnd->PostMessage(UWM\_READER\_SHUTTING\_DOWN);
	return 0;
} 

while(pPTZStruct->nPTZCommTerminate == 0)
{
	if(!fWaitingOnRead)
	{
		// Issue read Operation.
		if(!ReadFile(pPTZStruct->hPTZSerial,PTZbuffer, MAX\_BUFFER\_SIZE, &dwRead, &osReader))
		{
			if(GetLastError() != ERROR\_IO\_PENDING) // read not delayed
			{
				// Error in comms - report!!!
				return 0;
			}
			else
			{
				fWaitingOnRead = TRUE;
			}
		}
		else
		{
			// \*\*\*Read the data
		}
	}
	else
	{
		dwRes = WaitForSingleObject(osReader.hEvent, READ\_TIMEOUT);
		switch(dwRes)
		{
			// Read Completed
		case WAIT\_OBJECT\_0:
			if(!GetOverlappedResult(pPTZStruct->hPTZSerial, &osReader, &dwRead, FALSE))
			{
				DWORD dwError = GetLastError();
				switch(dwError)
				{
					case ERROR\_HANDLE\_EOF:
						return 0;
						break;
					case ERROR\_IO\_PENDING:
						return 0;
						break;
					case ERROR\_IO\_INCOMPLETE:
						return 0;
						break;
					case ERROR\_OPERATION\_ABORTED:
						return 0;
						break;
					default:
						// error in comms - report
						Dump1("Serial Read Error %d\\r\\n", ::GetLastError());
						return 0;
						break;
				}
			}
			else
			{
				// \*\*\*Read the Data 
			}
			fWaitingOnRead = FALSE;

Thanks for the help. That's all running now. Jim :-D

Hi there, Can someone please help me. I am programming a dialog GUI for a touch screen interface to control a motor and I want it to run the motor when someone presses the button and holds it and then the motor is stopped when it button is released. Can I use BN_PUSHED and BN_UNPUSHED? or is there another way. Does anyone have any examples that I could reference? Cheers Jim :confused:

Hi there, I am trying to populate a combo box of available com ports. I call my openSerialport function from my init dialog function but as soon as CreateFile is executed I get an Unhandled Exception error which has the info 0xC0000005 : Access Violation. Can anyone help??????? Code Below InitDialog call

BOOL CPTZControlDlg::OnInitDialog()
{
int i, j, hr;
char portStr[7];

CDialog::OnInitDialog();

// Set the icon for this dialog.  The framework does this automatically
//  when the application's main window is not a dialog
SetIcon(m\_hIcon, TRUE);			// Set big icon
SetIcon(m\_hIcon, FALSE);		// Set small icon

// construct a list of available COM ports and put into combo box
j=0;
for (i=0 ; i<PORTNUM ; i++) 
{
	hr = m\_serialCtrl->OpenSerialPort(i,0);
	if (hr == 0) 
	{
		g\_exists\[i\] = 1;
		g\_nComPortInd\[j\] = i;
		g\_comport\[i\] = j;
		j++;
		sprintf(portStr,"COM%d",i+1);
		m\_comPort.AddString(portStr);

	} 
	else 
		g\_exists\[i\] = 0;
}

return TRUE;  // return TRUE  unless you set the focus to a control

}

Open Serial port function

int CSerialControl::OpenSerialPort(int pcCommPortInd,int radd)
{
DCB dcb;
BOOL fSuccess;
char pcCommPort[14];
int m_nComPort;

m_nComPort = pcCommPortInd;

sprintf(pcCommPort,"COM1",pcCommPortInd+1);

m_hCom = CreateFile( "COM1",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED,
NULL
);

if (m_hCom == INVALID_HANDLE_VALUE)
{
m_hCom = NULL;
return COMMSERROR;
}

if (radd==0)
{
CloseSerialPort();
return COMMSGOOD;
}

Cheers Jim :confused:

Thanks for that, I'll give it a go. I'll let you know how I get on. Cheers Jim ;)

Hi, I need to be able to toggle the handshaking lines on the serial port. Can anyone help with this. I am using vc6 on XP. Cheers Jim :confused:

Hi all, I am developing a portable system and want to be able to change the IP address of the PC from my application. I am using VC6, does anyone have any ideas of how to do this? Cheers Jim :confused:

One thing I have tried is moving the WSAStartup to the main initDialog function and the app goes through. Any ideas???? jim:confused:

okay, can you help? I am not sure how to do this:~ Below are the only references I have for UnitInfoStruct

struct UnitInfoStruct *pUnit = NULL;

	pUnit = new struct UnitInfoStruct;

vector<struct UnitInfoStruct \*> m\_vszIPAddr;

struct UnitInfoStruct {
char szIPAddr[16];
char szSer[9];
};

As you can tell, I am struggling with this a bit. Jim

Okay, thanks.....i'll take a look

Sorry, just thought that might have fixed it. :(

here's a copy of the stack not sure what I am looking for??? Jim

std::vector<UnitInfoStruct *,std::allocator<UnitInfoStruct *> >::size() line 114 + 15 bytes
CAlinksRemoteControl::ScanForUnits() line 480 + 14 bytes
CMultiVueDlg::OnInitDialog() line 130
AfxDlgProc(HWND__ * 0x00240334, unsigned int 272, unsigned int 3081096, unsigned int 3081096) line 35 + 14 bytes
USER32! 7e418734()
USER32! 7e42413c()
USER32! 7e423b30()
USER32! 7e43e599()
USER32! 7e418734()
USER32! 7e418816()
USER32! 7e42a013()
USER32! 7e42a998()
CWnd::DefWindowProcA(unsigned int 272, unsigned int 3081096, long 0) line 1000 + 32 bytes
CWnd::Default() line 249
CDialog::HandleInitDialog(unsigned int 3081096, unsigned int 3081096) line 624 + 8 bytes
CWnd::OnWndMsg(unsigned int 272, unsigned int 3081096, long 0, long * 0x0012f800) line 1815 + 17 bytes
CWnd::WindowProc(unsigned int 272, unsigned int 3081096, long 0) line 1585 + 30 bytes
AfxCallWndProc(CWnd * 0x0012fc08 {CMultiVueDlg hWnd=???}, HWND__ * 0x00240334, unsigned int 272, unsigned int 3081096, long 0) line 215 + 26 bytes
AfxWndProc(HWND__ * 0x00240334, unsigned int 272, unsigned int 3081096, long 0) line 368
AfxWndProcBase(HWND__ * 0x00240334, unsigned int 272, unsigned int 3081096, long 0) line 220 + 21 bytes
USER32! 7e418734()
USER32! 7e418816()
USER32! 7e42927b()
USER32! 7e42651a()
USER32! 7e42683e()
USER32! 7e439b43()
CWnd::CreateDlgIndirect(const DLGTEMPLATE * 0x0042b540, CWnd * 0x00000000 {CWnd hWnd=???}, HINSTANCE__ * 0x00400000) line 327 + 36 bytes
CDialog::DoModal() line 531 + 32 bytes
CMultiVueApp::InitInstance() line 71 + 11 bytes
AfxWinMain(HINSTANCE__ * 0x00400000, HINSTANCE__ * 0x00000000, char * 0x00151f0c, int 1) line 39 + 11 bytes
WinMain(HINSTANCE__ * 0x00400000, HINSTANCE__ * 0x00000000, char * 0x00151f0c, int 1) line 30
WinMainCRTStartup() line 330 + 54 bytes
KERNEL32! 7c817067()

No, that didn't work :confused:

ok, so what do I need to do? :~

Sorry, not sure I follow....that is the base class of the project....isn't it? Am I missing something here?:confused: