C / C++ / MFC Discussion Boards

LittleYellowBird21-Jun-02 0:23

21-Jun-02 0:23

My app uses serial comms to collect data, it runs perfectly on my 1.1G Celeron XP machine, but when I tested it on a Cyrix PR233 running Win98 it crashes. After several hours of running OK it gives an error, which is 'Invalid Handle' - for the comm port.

What could cause it to loose the handle for the comm port?

Is it more likely to be the PC that is the critical difference or the operating system?

Anyone else had problems like this?

I've written the serial comms from a simple example, are there any good libraries or stuff that I could use that would make it more robust? Any recommendations?

Ali

Re: Serial Comms - Invalid Handle

munklinde21-Jun-02 2:03

munklinde

21-Jun-02 2:03

Go to the msdn.microsoft.com and search for MTTTY (yep 3xT .. not a typo)
Just follow the example and you've got a great running app.;P

how to set the text of a cell in a DataGrid Control

21-Jun-02 0:20

Hi, all
i added a datagrid control(Microsoft DataGrid Control version6.0(oledb)) to my dialog, but i don't know how to set the values in the cells, should i call something before i call SetText()?
Thanks;)

Re: how to set the text of a cell in a DataGrid Control

yeeeooowww21-Jun-02 0:58

yeeeooowww

21-Jun-02 0:58

You dont need to call anything before SetText()...
just make sure you have set the control variable for the Grid and that you are in the correct cell that you want to set your text to.
Poke tongue | ;-P

If you want a helping hand, you'll find one at the edof your arm.

Re: how to set the text of a cell in a DataGrid Control

Chen Jiadong21-Jun-02 1:19

Chen Jiadong

21-Jun-02 1:19

but what "the control variable for the grid" should be set? could u provide some simple code?;)

Compiler error using beginthreadex()

21-Jun-02 0:16

Hi,
I'd like to replace CreateThread() with beginthreadex(), but I get an unknown identifier error.
process.h is included, anything else I need to do?

Re: Compiler error using beginthreadex()

Nish Nishant21-Jun-02 0:31

Nish Nishant

21-Jun-02 0:31

Anonymous wrote:
beginthreadex(),

It should be _beginthreadex

Note the '_'

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Re: Compiler error using beginthreadex()

Joao Vaz21-Jun-02 0:32

Joao Vaz

21-Jun-02 0:32

You must link with the multithreaded lib , or else you get errors ..

Cheers,
Joao Vaz
A person who is nice to you, but rude to the waiter, is not a nice person - Natalie Portman (Padme/Amidala of Star Wars)

Re: Link multithreaded DLL automatically (_beginthreadex)=?

21-Jun-02 0:51

Joao Vaz wrote:
You must link with the multithreaded lib , or else you get errors ..

ah yes, found it. thx!

Can I use a pragma to link with the multithreaded DLL? Something like #pragma comment(lib, "xxx.lib"), what do I need to set for xxx?

Which alternative is better: 'Multithreaded' or 'Multithreaded DLL'? Last one makes executable much smaller, does it run on Win9x/2000/XP still?

Re: Link multithreaded DLL automatically (_beginthreadex)=?

21-Jun-02 2:31

I'll use something like this:

BOOL createthread(HTHREAD* phThread, ThreadStartFunction pThreadFunc, void* pThreadParameter)
{
	assert(phThread && !*phThread);
#ifdef _MT
	unsigned int nDummy;
	*phThread = (HTHREAD) _beginthreadex(NULL,0,pThreadFunc,pThreadParameter,0,&nDummy);
#else
	unsigned long lDummy;
	*phThread = CreateThread(NULL,0,pThreadFunc,pThreadParameter,0,&lDummy);
#endif
	return *phThread?TRUE:FALSE;
}

File associations

Senkwe Chanda21-Jun-02 0:15

Senkwe Chanda

21-Jun-02 0:15

Hi guys, I need a few pointers on file associations. I'm trying to write an app that decrypts files of a certain file extension, lets's say the extension is ".abc". I want that when someone clicks on the encrypted file, say "MyEncryptedFile.abc", it is opened via my decryptor. My question is, do I need to pass that file name to my decryptor exe and if so...how? Or, is there no need for this since files of type ".abc" are associated with my exe?

Hope that makes sense.

Senkwe

Just another wannabe code junky

Re: File associations

Nish Nishant21-Jun-02 0:28

Nish Nishant

21-Jun-02 0:28

Senkwe Chanda wrote:
My question is, do I need to pass that file name to my decryptor exe and if so...how?

It depends on how you have set up the string in the registry.
For an example see :-
HKEY_CLASSES_ROOT\txtfile\shell\open\command

It'll show you how a txt file is opened by notepad
The value is :-
%SystemRoot%\system32\NOTEPAD.EXE %1

Thus the %1 will automatically be sent to notepad.exe as a cmdline parameter where %1 is the file that has been double-clicked or opened from explorer

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Re: File associations

Senkwe Chanda21-Jun-02 0:37

Senkwe Chanda

21-Jun-02 0:37

Thanks Nishant, am I limited to only passing through the filename? Suppose I required two command line parameters for the exe, the file name and a password for example.

If you can, please point me to a good site where I can get more info on the topic.

Regards

Senkwe

Just another wannabe code junky

Re: File associations

redeemer21-Jun-02 0:46

redeemer

21-Jun-02 0:46

You have to look at shell programming, take a look at it in MSDN.

Re: fstream

Renjith Ramachandran21-Jun-02 0:42

Renjith Ramachandran

21-Jun-02 0:42

make sure u close the File Handle before open next time..

Renjith-The CPian.

Re: fstream

Christian Graus21-Jun-02 1:49

Christian Graus

21-Jun-02 1:49

showing us some actual *code* might help.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Re: fstream

JohnnyG21-Jun-02 7:33

JohnnyG

21-Jun-02 7:33

I ran into something similar to this with memory mapped files. It turns out that I had to create the memory mapped file (wrapper) object dynamically even though I saw that the destructor for the object that contained the static file object was executing correctly.

So, I did a "myFileObj = new FileObj;" and a "delete myFileObj" in the destructor and then it actually closed the file. Wierd, huh? But, that was the solution.

Re: fstream

Christian Graus21-Jun-02 11:40

Christian Graus

21-Jun-02 11:40

em wrote:
ifsFile.open(ListPath, ios::nocreate);

Get rid of ios::nocreate. You don't need it.

em wrote:
I've set a breakpoint on ifsFile.close();

That's dumb. Set a breakpoint at the start, then you'll find out if the file was good on the way through.

em wrote:
if (ifsFile)

Get rid of this as well.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Don't Create document in MDI Application

20-Jun-02 22:26

If I use the AppWizard to create an MDI applicaiton. It'll open a document at first. How can i disable the initial document/childview/childframe creation ? I'll create myself in the Menu by using DocTemplate->CreateNewFrame()

Re: Don't Create document in MDI Application

Roger Allen20-Jun-02 23:25

Roger Allen

20-Jun-02 23:25

Put this code in your InitInstance()

// stop a new document being created if just run normally
if (cmdInfo.m_nShellCommand == CCommandLineInfo::FileNew)
    cmdInfo.m_nShellCommand = CCommandLineInfo::FileNothing ;

Before the call to ProcessShellCommand()

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

网络安全组件让你开发更轻松，省事少力！

20-Jun-02 20:04

网络安全组件让你开发更轻松，省事少力！
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Re: 网络安全组件让你开发更轻松，省事少力！

Christian Graus20-Jun-02 20:52

Christian Graus

20-Jun-02 20:52

I dunno, but it sure looks cool. I reckon there's more than 26 characters in this post alone, learning to write this language must be a hell of a challenge. Not to mention how big your keyboard must be !!!

With all those words, you'd think they'd have one for socket Smile | :)

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002

Re: 网络安全组件让你开发更轻松，省事少力！

Nish Nishant20-Jun-02 22:33

Nish Nishant

20-Jun-02 22:33

Christian Graus wrote:
With all those words, you'd think they'd have one for socket

Laugh | :laugh:

That's one for the Best-of-CG collection!!!

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

How can I find the total size of the text in pixels

20-Jun-02 19:32

GetTextExtentPoint32 returns the text size in pixels but it is always the clipped to the window extent. I want the total size of the text which doesnot fit completely in the window. Any idea how this can be done?

Re: How can I find the total size of the text in pixels

Roger Allen20-Jun-02 23:26

Roger Allen

20-Jun-02 23:26

Can't you just call CDC::GetTextExtent(text)?

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

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