C / C++ / MFC Discussion Boards

With_problem30-Jul-06 16:24

30-Jul-06 16:24

hello guys,
1) I have to take data from server and store in my msaccess database and also display the current changes in a text file I am working with dialog based application.And one more thing
If there is any good link pls provide me.

For this function i have create a button and I want by clicking that button the data from server will b display in a text file is that possible.

Any small hint will help to proceed further.
Thanks

-- modified at 1:04 Monday 31st July, 2006

Re: store in database

Hamid_RT5-Aug-06 9:19

Hamid_RT

5-Aug-06 9:19

What do you need?

WhiteSky

Several issues of sync/socket in MS plateform

Tony_chan30-Jul-06 15:50

Tony_chan

30-Jul-06 15:50

1.One socket with 2 threads do read/write,is that ok?
2.One socket with 2 threads write to that socket with no lock,could the OS provide the receiver's pack oreded,that is,if thread A and thread B send message to the same socket with no sync protected,for exp A send "AAAA",B send "BBBB",is is possible for the receiver socket recive AAAABBBB(ordered) or ABAABAB(disorederd).
3.If using WSASend api to send a buf to several sockets,can we simply use a loop to send like following examples
WSABUF buf;
buf.buf = "test";
buf.len = 4;
Socket list[someNum];
for(i = 0;i++;i< someNum)
{
WSASend(list[0],&buf,1,...);//here we keeping use the same buf!!
}
if its not so correct,is there any good solutions?

Best regards!
Blush | :O

OK - how does this crap work?

Lord Kixdemp30-Jul-06 14:56

Lord Kixdemp

30-Jul-06 14:56

Hello everyone!
I still don't quite get how C works... I always get weird, and I mean weird errors, like this one:

I have a char* string. It's a filename. If I printf() it, it gives me "x5" or other characters that don't have anything to do with it. But if I open the file, it opens correctly, and I can even display a string on the file...

Why is this? Is there a tutorial or something that explains this kind of stuff? Thanks!

Windows Calculator told me I will die at 28. Frown | :(

Re: OK - how does this crap work?

C^hris L^osinger30-Jul-06 16:24

C^hris L^osinger

30-Jul-06 16:24

Kixdemp wrote:
If I printf()

can you show us your printf() call ?

and, does that char* point to ?

Why donchoo take a peekchur mayn?
OK, cleeeeek

Re: OK - how does this crap work?

Christian Graus30-Jul-06 19:53

Christian Graus

30-Jul-06 19:53

Interesting - you're learning C ? Do you do embedded work ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: OK - how does this crap work?

Lord Kixdemp31-Jul-06 13:52

Lord Kixdemp

31-Jul-06 13:52

Damn, now this really is screwed up... I put in a printf() statement somewhere outside the function, then it works correctly, but then I remove it and it still works... Maybe I'm forgetting to press Ctrl+Shift+B before going into my command prompt? Am I that stupid? I'll post back with an example whenever I find something... Sorry about that Blush | :O

, and thanks!

PS: Christian Graus, I'm doing a DOS program, which I'll probably port to some older OS's... It's not worth it, who still uses damn CP/M? But it'll still be fun! Laugh | :laugh:

Windows Calculator told me I will die at 28. Frown | :(

Re: OK - how does this crap work?

Lord Kixdemp31-Jul-06 14:17

Lord Kixdemp

31-Jul-06 14:17

Kixdemp wrote:
Am I that stupid?

I really am, I was using the parameters of strcpy() backwards... Mad | :mad:

Please punch me. Frown | :(

Windows Calculator told me I will die at 28. Frown | :(

TCHAR Conversions from char*

Not Knuth30-Jul-06 14:44

Not Knuth

30-Jul-06 14:44

I need some help converting between TCHAR strings and ASCII strings. (I understand that the actual type for TCHAR is decided by the compiler switches.) In this case, TCHAR is UNICODE. But I have a char* string passed into my function that I need to deal with. My questions:

What's the best way to convert the char* string (array) to TCHAR? I'm doing it one char at a time in a loop, but I am hoping for something more elegant.

How do I handle the ASCII end of string in TCHAR? For example, in one section I need to loop through the characters in the TCHAR string. I want to stop if I hit a new line from the char* string. That's easy in an ASCII string, but in UNICODE... well it's probably just as easy if you know what to look for! Unsure | :~

Should I be looking for TWO TCHAR characters (0xA and 0x0)? or something else?

Thank you!

Re: TCHAR Conversions from char*

Naveen30-Jul-06 17:29

Naveen

30-Jul-06 17:29

there is an api for the same

MultiByteToWideChar()....

nave

Re: TCHAR Conversions from char*

ThatsAlok30-Jul-06 18:35

ThatsAlok

30-Jul-06 18:35

Not Knuth wrote:
How do I handle the ASCII end of string in TCHAR? For example, in one section I need to loop through the characters in the TCHAR string. I want to stop if I hit a new line from the char* string. That's easy in an ASCII string, but in UNICODE... well it's probably just as easy if you know what to look for! Should I be looking for TWO TCHAR characters (0xA and 0x0)? or something else?

wcstombs

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: TCHAR Conversions from char*

John Saunders30-Jul-06 19:33

John Saunders

30-Jul-06 19:33

Place the macro USES_CONVERSION at the beginning of your function. You then have access to all of the string conversion macros. You can convert between any of ACSII (A), OLE (OLE), WIDE (W)and TCHAR (T). To convert ASCII to TCHAR do the following.

LPSTR *lpSrc;
LPTSTR *lpDest = A2T(lpSrc);

Similarly T2A, A2W, W2A, A2OLE, etc can be used. You can also put a C after the 2 to get a const string returned.

The good thing about these macros is that if you build the application with _MBCS defined, TCHAR is the same as ASCII so the A2T macros becomes nothing. If you build with _UNICODE defined then it will allocate a buffer and covert to Unicode for you. The memory is allocated on the stack with _alloca, so you can't keep the converted string after the function returns without taking a proper copy of it first. Also don't use inside a loop because it could allocate a lot of memory if the loop iteration is large.

Re: TCHAR Conversions from char*

PJ Arends30-Jul-06 20:57

PJ Arends

30-Jul-06 20:57

John Saunders wrote:
Place the macro USES_CONVERSION at the beginning of your function

John Saunders wrote:
Also don't use inside a loop because it could allocate a lot of memory if the loop iteration is large.

If you use the newer ATL7 conversion macros then you do not have to use USES_CONVERSION and you can safely use the conversion macros inside a loop.

http://msdn2.microsoft.com/en-us/library/87zae4a3.aspx[^]

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

MultiByteToWideChar - Implementation?

Not Knuth31-Jul-06 3:05

Not Knuth

31-Jul-06 3:05

Thanks, this works fine. But I am wondering how the macros work. I followed the code and see that it ultimately ends up at defs for MultiByteToWideChar and others. But of course the code is not shown. So I wonder if this is implemented as just a big lookup table or if there is some better way to approach this.

Obviously this question has become somewhat academic at this point. My initial problem is resolved. But I am just thinking about how I would have implemented this and I don't see a better way than using a big lookup. That seems too clumsy.

Re: MultiByteToWideChar - Implementation?

Zac Howland4-Aug-06 9:12

Zac Howland

4-Aug-06 9:12

An alternative to using the ATL macros is to use the _bstr_t class. It has constructors that take both ASCII and WIDE character sets, and have overloaded operators for both char* and wchar_t*. It will end up calling the same functions in the end (the MultiByteToWide, etc.) but it easier to read and debug since it isn't a macro.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Invisible Process [modified]

darkcloud.42o30-Jul-06 11:43

darkcloud.42o

30-Jul-06 11:43

Hi,

Im writing a webserver which loads an exe file as cgi application. What im trying to do is not make the window popup each time someone visits the site.
I still need the process visible in taskmanager though...

Heres what im using at this point to load the cgi app and get the std out... which is what i need to do...

char psBuffer[1024];
FILE *pPipe;
send(AcceptSocket, header, strlen(header), 0);
pPipe = _popen("test.exe", "r");
//..other functions
_pclose( pPipe );

Any Help on this matter is appreciated.

Re: Invisible Process

Stephen Hewitt30-Jul-06 13:46

Stephen Hewitt

30-Jul-06 13:46

I assume you've got a console window popping up. If you make the exe a normal Win32 project instead of a console one you will not get a console window popping up.

Steve

Re: Invisible Process

darkcloud.42o30-Jul-06 14:06

darkcloud.42o

30-Jul-06 14:06

Thnx.. I dont think thats going to help in this situation.. because if users were to write thier own cgi.. they would have to do the same.. and such is too much to ask in my opinion... Theres got to be another way to hide the bloody window...

Re: Invisible Process

benjymous30-Jul-06 22:23

benjymous

30-Jul-06 22:23

Assuming you're on XP (or better..) can't you just run your Web Server as a different user - this way the web server will have a seperate desktop, on which any cgi programs will run

--
Help me! I'm turning into a grapefruit!
Buzzwords!

How to run rc.exe from a command line ?

zmau30-Jul-06 10:59

zmau

30-Jul-06 10:59

I work with vc++ 6 (don't lough).
I have an MFC project with a resource file created by the MFC wizzard.

I can not run rc.exe on this file. It says "RC: fatal error RC1107 :
invalid usage: use rc /? for help"
I have no problems running rc.exe my own (simple) resource files.
I assume that VC runs rc.exe with some more defines/swithces.

Can anyone tell me how should I run it (and succeed) ?

Thanks
Maurice

website blocking Application

_tasleem30-Jul-06 9:30

_tasleem

30-Jul-06 9:30

hi all i want to write teh software that block certain site i.e yahoo.com how to do that any help is welcomned.Thanks

Tasleem Arif

Re: website blocking Application

Anilkumar K V30-Jul-06 20:08

Anilkumar K V

30-Jul-06 20:08

Try writing BHO ( Browser Helpler Objects)

errors in DDK???

dSolariuM30-Jul-06 1:17

dSolariuM

30-Jul-06 1:17

Hi,
I have a problem with DDK.
when I include every file of DDK (like video.h)
it gives me many errors.
Why?
please help me.
thanks.

Every new thing you learn,Gives you a new personality.

Re: errors in DDK???

Vipin Aravind30-Jul-06 1:41

Vipin Aravind

30-Jul-06 1:41

question now would be what are the errors you are getting?

vipin - Microsoft MVP
http://www.explorewindows.com

vertically scrolling a listbox

CaesarCZ30-Jul-06 0:37

CaesarCZ

30-Jul-06 0:37

hello there,
I would like to scroll my CListBox (in other words, not a CListCtrl or CListView!) so that a certain item is the topmost visible item in the list (having it visible is not enough). Any ideas? I tried SetScrollPos, and although the range is meaningful, only the scrollbar gets "scrolled" (the bar moves), but the listbox itself doesn't move.

I'm getting quite desperate and all i can find if horizontal scrolling everywhere.

thanks

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