C / C++ / MFC

Mike Dimmick11-Aug-03 11:13

Mike Dimmick

11-Aug-03 11:13

There's no end-of-list mark with variable argument lists. You've been lucky so far that, sometimes, the next item on the stack has been zero.

You need to either look for a terminator value, or know how many items are in your list (by, for example, passing that as the first argument).

leppie11-Aug-03 11:23

leppie

11-Aug-03 11:23

OK that just plain sux.... it will be easeir just to pass a linked list.

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

geo_m12-Aug-03 1:06

geo_m

12-Aug-03 1:06

hmm, maybe, but then you'll loose some of the type of comfort that (...) provides. Imagine that before every printf() you have to prepare a linked list of arguments :-/.

But on the other side, the ... parameters doesn't have the type control, so it's some sort of evil Wink | ;-)

leppie12-Aug-03 7:13

leppie

12-Aug-03 7:13

My hack is just pass a NULL at the end....

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

lossing focus on a dialog box

geo_m12-Aug-03 7:34

geo_m

12-Aug-03 7:34

Any way, that allows you to detect end of the parameter list is acceptable. With the NULL backstop is only one disadvantage which comes to mind when you really need to pass some NULL as a valid value to one of normal parameters.

(Steven Hicks)ⁿ⁺¹11-Aug-03 10:34

(Steven Hicks)ⁿ⁺¹

11-Aug-03 10:34

I created a Modaless dialog from my application, how can I detect that the dialog has lost focus (ex when the user clicks within the parent window and the dialog box is still there. I need this b/c without it new Modaless dialog boxes can be created with the existing one there.

-Steven Hicks

CPA

CodeProjectAddict

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Re: lossing focus on a dialog box

valikac11-Aug-03 12:08

valikac

11-Aug-03 12:08

One solution is to add a handler for WM_KILLFOCUS.

Kuphryn

COM1

Anonymous11-Aug-03 9:54

11-Aug-03 9:54

who to flush the receivebuffer of the serial interface (com1)

David Crow11-Aug-03 10:33

David Crow

11-Aug-03 10:33

How are you currently reading from it?

Anonymous11-Aug-03 11:26

11-Aug-03 11:26

#ifndef MESSGERAETE_H
#define MESSGERAETE_H

#include "windows.h"

class Messgeraete{

public:

Messgeraete();
~Messgeraete();

void takeValues();
double getValue(int value);
void stopThread();

//-1: Messung wurde abgerochen, 0 keine gütligen Werte, 1 gültige Werte wurden gelesen
int getMessflag();

static DWORD messenThread(LPVOID);

private:

HANDLE h_com;
HANDLE h_messThread;

DCB dcb;
COMMTIMEOUTS cto;

double value1, value2;
int messflag;

};

#endif

Messgeraete::Messgeraete(){

messflag=0;

h_com = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0 , NULL);

DCB dcb_neu;
COMMTIMEOUTS cto_neu;

GetCommState(h_com, &dcb);
GetCommState(h_com, &dcb_neu);

dcb_neu.BaudRate = 9600;
dcb_neu.ByteSize = 8;
dcb_neu.Parity = NOPARITY;
dcb_neu.StopBits = ONESTOPBIT;
SetCommState(h_com, &dcb_neu);

GetCommTimeouts(h_com,&cto);
GetCommTimeouts(h_com,&cto_neu);
cto_neu.ReadTotalTimeoutConstant=0;
cto_neu.ReadTotalTimeoutMultiplier=0;
SetCommTimeouts(h_com,&cto_neu);

}

Messgeraete::~Messgeraete(){

SetCommTimeouts(h_com,&cto);
SetCommState(h_com, &dcb);
CloseHandle(h_com);

}

DWORD Messgeraete::messenThread(LPVOID lparam){

Messgeraete *mp = (Messgeraete*)lparam;

int i;
unsigned long nBytesRead1,nBytesRead2;
char inbuffer1[13];
char inbuffer2[13];

char temp[9];
temp[8]=0;

ReadFile(mp->h_com, &inbuffer1, 13, &nBytesRead1, NULL);
ReadFile(mp->h_com, &inbuffer2, 13, &nBytesRead2, NULL);

// CString str;
// str.Format("%s\n%s",inbuffer1,inbuffer2);
// AfxMessageBox(str);

for(i=0;i<8;i++) temp[i]=inbuffer1[i+4];
mp->value1=atof(temp);

for(i=0;i<8;i++) temp[i]=inbuffer2[i+4];
mp->value2=atof(temp);

if(inbuffer1[0]=='9'){mp->value1=-1;AfxMessageBox("Messschieber ist nicht eingeschaltet oder nicht richtig angeschlossen");}
if(inbuffer2[0]=='9'){mp->value2=-1;AfxMessageBox("Messuhr ist nicht eingeschaltet oder nicht richtig angeschlossen");}

mp->messflag=1;

return 0;

}

void Messgeraete::takeValues(){

messflag=0;
h_messThread=CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)messenThread, (LPVOID)this, 0, NULL);

}

double Messgeraete::getValue(int value){

if (value==1) return value1;
else return value2;

}

void Messgeraete::stopThread(){

DWORD dw;
GetExitCodeThread(h_messThread, &dw);
TerminateThread(h_messThread, dw);
value1=value2=-1;
messflag=-1;

}

int Messgeraete::getMessflag(){ return messflag; }

David Crow12-Aug-03 2:35

David Crow

12-Aug-03 2:35

FlushFileBuffers(h_com);

Anonymous12-Aug-03 3:34

12-Aug-03 3:34

doesn't work

in msdn is writte:
If hFile is a handle to a communications device, the function only flushes the transmit buffer.

I want to flush the receive buffer

any ideas?

Anonymous12-Aug-03 9:21