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Wow, last update was 1998!!! Anything more recent?
Thanks though 
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There is some more recent stuff here.
HPS HwndSpy - GUI developer's aid to visually
locate and inspect windows. For the month of August
only, use coupon code CP-81239 for 30% off.
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I am writing a class for serial port communication.
It always returns FALSE when I set commport state by calling
win32 api SetCommState.
following is some code from my class:
//code starts here
//m_hComm is an effective handle to commport
m_dcb.DCBlength= sizeof(DCB);
m_dcb.BaudRate =nBaud;
m_dcb.ByteSize = nDataBits;
m_dcb.Parity =nParity ;
m_dcb.StopBits =nStopBits;
m_dcb.fBinary=TRUE;
m_dcb.fDsrSensitivity=FALSE;
m_dcb.fParity=bParity;
m_dcb.fOutX=FALSE;
m_dcb.fInX=FALSE;
m_dcb.fNull=FALSE;
m_dcb.fAbortOnError=TRUE;
m_dcb.fOutxCtsFlow=FALSE;
m_dcb.fOutxDsrFlow=FALSE;
m_dcb.fDtrControl=DTR_CONTROL_DISABLE;
m_dcb.fDsrSensitivity=FALSE;
m_dcb.fRtsControl=RTS_CONTROL_DISABLE;
m_dcb.fOutxCtsFlow=FALSE;
m_dcb.fOutxCtsFlow=FALSE;
BOOL bRet= ::SetCommState(m_hComm, &m_dcb);
if(!bRet)
{
CloseHandle(m_hComm);
MessageBox(NULL, "Set comm state error!", NULL, MB_OK);
return FALSE;
}
//code ends here
The bRet of above is always FALSE.How I can call SetCommState Successfully?
I need your help. Thanks.
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Shouldn't it be SetCommState, not ::SetCommState?
Cheers,
Fredrik
"Felix qui potuit rerum cognoscere causas."
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hi,
I met a problem when I using serialize/deserialize of CObject in VC++ 6.0. Who can kindly give some help?
I serialize a object array to store them in the disk file. When I try to deserialize them back from file. I found the time spent on this would increase exponentially with the size of file. When file is 500K, it need about 1 senconds. when file is 1M, it takes about 3 second... when file is 15M, it takes several minutes. I had hoped my program could handle file of handreds megabytes. this speed is unaccept for me.
regards,
jim wang
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Have you profiled the code to see where the bottleneck is? Glowcode www.glowcode.com[^] is good for this. VC++ also has profiling capabilities.
The exponential increase doesn't seem right. It may be a combination of reading/parsing and allocating memory. If you are using the heap and that's a performance issue then there are fast heap managers around.
But I have to wonder why you are serializing a 15M file.
I can tell you that using pugXML (here on CP) in Memory Mapped File mode I can read and parse a 10M XML file in about .5 sec on a slow old 550Mhz P3.
Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com
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When you start a thread using AfxBeginThread() does the thread function have to be a static member? Anyone know how to start a thread function that isn't static?
Mike Ellertson
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Mike Ellertson wrote:
does the thread function have to be a static member?
Yes. Pass a pointer to the class as an LPVOID parameter then inside the static function call whatever member function using the pointer.
John
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Mike Ellertson wrote:
Anyone know how to start a thread function that isn't static?
Take a look at this article[^].
Who is 'General Failure'? And why is he reading my harddisk?!?
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The m_child is derive from CWnd, but it can't get focus, the caption of this child window is always gray.
m_child.Create( NULL, "OK", WS_VISIBLE | WS_CHILD | WS_CAPTION,
rc, this, 100, NULL );
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You need to provide more information. What class is m_Child? Where are you creating it?
If this is on a dialog, you may be missing WS_TABSTOP. If you are inheriting from CStatic
then you will also have issues, as that passed focus to its parent.
You should also look up WM_GETDLGCODE.
etc.
Iain.
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m_Child is my custom window and it derive from CWnd, this is SDI project, m_Chils is member of my view.
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I want to make a program that connects to a hardware circuit through either the printer port or a serial port. I am wondering how I could make my application run in the background until the circuit transmits some data through the port, upon which I should receive and manipulate it. Could you please tell me how to do it in MFC or Win32 API? Thank you very much.
Hosam Aly Mahmoud
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I was once told that u couldnt start a thread from a class function like so:
class MyClass
{
public void ThreadFunc();
}
CreateThread(ThreadFunc,blablabla);
Ok this isnt exact but it should tell u what i mean. But if thats the case, then how did they do this in MFC. There is a class CWinThread, and u can use AfxBeginThread to start a thread like that, so apparently it is creating a thread from a class.... So can i make a class that encapsulates my thread? How?
Thanks.
Kuniva
--------------------------------------------
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Declare ThreadFunc() as static.
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"
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Do you know of any way to get around the static function requirement? It's kind of a pain, because now I can't access other data members that aren't static.
Mike Ellertson
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Mike Ellertson wrote:
Do you know of any way to get around the static function requirement?
No, not for threads.
Mike Ellertson wrote:
I can't access other data members that aren't static.
The CreateThread() accepts an lParam value that is passed to the ThreadProc() function. Pass a pointer to the thread object, and then you can access the non-static members through this pointer. You can simply call a non-static function to do all the work if you want to:
class ThreadClass
{
public:
static LRESULT CALLBACK ThreadProc(LPARAM lParam)
{
ThreadClass *pThread = (ThreadClass*)lParam;
return pThread->NonStaticThreadProc();
}
LRESULT NonStaticThreadProc()
{
return 0;
}
};
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"
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Wow.. Thank you very much
Kuniva
--------------------------------------------
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You're welcome
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"
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void Bla(Foo foo) ->
You cannot modify the parameter foo directly, only a copy of its value will be passed.
void Bla(Foo *foo) ->
You can modify the address pointed to by foo with foo = 0x045345 or change the value with *foo = 123.
Make sure foo does not point to a NULL reference.
void Bla(Foo& foo) ->
Value passed by reference, you can change the value simply with foo = 123
regards
Greg
modified 12-Sep-18 21:01pm.
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Thanx
Greg S. wrote:
You can modify the address pointed to by foo with
I tend to differ... EG
void Bla(Foo* foo)<br />
{<br />
foo->a = 99;<br />
foo = NULL;<br />
}
foo.a == 99 after method, not NULL.
Greg S. wrote:
void Bla(Foo& foo)
->
Value passed by reference, you can change the value simply with foo = 123
The compiler wont even let me define the method. Is this a C++ specific operator? BTW I'm only (allowed to) use C, not C++.
leppie::AllocCPArticle(Generic DFA State Machine for .NET);
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void BlaP(Foo *foo);
void BlaR(Foo& foo);
Is the difference merely "syntax"  or are references somehow better than pointers? (I mean if you are dealing with one object, not an array of course!)
<marquee behavior="alternate">Hosam Aly Mahmoud
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References are not nessecairily better then pointers, it just depends on what you want to do! Using a pointer gives you the option to pass NULL (or use it as a default parameter)! On the other hand, when you don't want to change the contents of the object (making it constant) it's a lot easier with a reference!
A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.
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