C / C++ / MFC

Alignment and Packing of Structures

12-Jul-04 10:03

http://mathworld.wolfram.com/Sine.html[^]

"No matter where you go, there your are." - Buckaroo Banzai

-pete

jerry1211a12-Jul-04 7:29

jerry1211a

12-Jul-04 7:29

Can someone tell me where I can find some good info, on packing structures and alignment. I have never quite understood the topic.
I have to pack some structures in my Windows application.

Thanks.
Jerry

Re: Alignment and Packing of Structures

David Crow12-Jul-04 8:34

David Crow

12-Jul-04 8:34

Start with the #pragma pack() directive.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Alignment and Packing of Structures

jerry1211a12-Jul-04 8:51

jerry1211a

12-Jul-04 8:51

OK thanks.

Jerry

win32 drawing

Anonymous12-Jul-04 7:00

Anonymous

12-Jul-04 7:00

Hai,
I'm using win32 vc++. I'm drawing the background for my button by subclassing.
But at no. of times I'm enabling and disabling the button in my dialog procedure(not in subclass proc). At those times how can I display the text in button as grey ie. how can I retrieve the text from the button and grey it?
Thanks a lot.

Re: win32 drawing

Navin12-Jul-04 10:57

Navin

12-Jul-04 10:57

Does GetWindowText work??

"Fish and guests stink in three days." - Benjamin Franlkin

Re: win32 drawing

md666612-Jul-04 11:14

md6666

12-Jul-04 11:14

hai,
GetWindowText did'nt work. It's getting the caption of the button which there is none cause i'm displaying the text of the button using DrawText() inside the subclass procedure.
anyway thanks.

Re: win32 drawing

Bob Stanneveld12-Jul-04 13:19

Bob Stanneveld

12-Jul-04 13:19

In that case, you should store a copy of the text displayed in a member variable inside the subclass. Then override the GetWindowText function (or define an other) that gives you acces to the caption of the button.

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

integrating C++ and VC++???

naveen_vi12-Jul-04 6:25

naveen_vi

12-Jul-04 6:25

Hi,

I have a device driver for a USB device written in VC++.There is a function in it to Read /write data to the USB port.Now I want to write a a function in C++ so that users can write programs in C++ rather in VC++.

Since c++ doesnt recognise data types like DWORD,BUFFER etc..I am struck.

Is there anyway i can link C++ and VC++.Can i use pointers.
thanks

nev.

palbano12-Jul-04 7:02

12-Jul-04 7:02

naveen_vi wrote:
Since c++ doesnt recognise data types like DWORD

From WinDef.h

typedef unsigned long DWORD;

naveen_vi wrote:
Is there anyway i can link C++ and VC++.Can i use pointers.

WTF | :WTF:

"No matter where you go, there your are." - Buckaroo Banzai

-pete

naveen_vi12-Jul-04 7:33

naveen_vi

12-Jul-04 7:33

Hi,

Thanks for ur reply.

So is it enough to include windef.h in my C++ program and write my own header file.
so with typdef can i convert all windows data and use them in my C++ file.

nev

palbano12-Jul-04 7:38

12-Jul-04 7:38

nev, i don't want to insult you but this is all beginner C++ issues. You should probably take the time to study these basic language concepts so that you understand them before you attempt to implement your project.

But, that's just my opinion... I could be wrong.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Michael Dunn12-Jul-04 9:14

Michael Dunn

12-Jul-04 9:14

naveen_vi wrote:
so that users can write programs in C++ rather in VC++.

Not sure I understand what you're asking. Visual C++ is the IDE, C++ is the language. You don't need VC to write C++.

--Mike--
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Re: One Question Mr. MIke

Anonymous12-Jul-04 10:05

Anonymous

12-Jul-04 10:05

hi mike,

I have a USB chip.They have given me the device driver and thier function looks like this.
http://www.ftdichip.com/knowledgebase/d2xx/manual/userguide.htm

write function is:
FT_STATUS FT_Write ( FT_HANDLE ftHandle, LPVOID lpBuffer, DWORD dwBytesToWrite, LPDWORD lpdwBytesWritten ) .They actually imported functions from win32 api(kernell32.dll).

where FT_status is ULONG data type.
http://www.ftdichip.com/knowledgebase/d2xx/manual/userguide.htm

If i just want to write a C++ program to write my data into LPVOID lpbuffer.How do i di it.I want my function to look like

write(int addr,unsigned char data);

nev

One Question Mr. MIke

ThatsAlok12-Jul-04 20:40

ThatsAlok

12-Jul-04 20:40

Helloo sir,with all due respect,
could you give me useful pointer over smartcard api's
thanks

-----------------------------
"I Think It will Work"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Michael P Butler13-Jul-04 1:06

Michael P Butler

13-Jul-04 1:06

Alok the programmer wrote:
could you give me useful pointer over smartcard api's

What kind of API. Are you talking about a smart card reader or the API of the card itself. The API's usually depend on the hardware being used to read the cards. Google is your best friend in these matters unless you know the manufacturer of your hardware/card.

Michael

CP Blog [^]

Problem with find in string

Michael P Butler13-Jul-04 1:03

Michael P Butler

13-Jul-04 1:03

naveen_vi wrote:
Since c++ doesnt recognise data types like DWORD,BUFFER etc..I am struck.

DWORD, BUFFER etc are all Windows types. If you are writing a Windows application then these will be available in any C++ compiler. Most of these are defined in WINDEFS.H and map to standard C++ types.

Your question is a little vague. More information would allow us to help you better.

Michael

CP Blog [^]

Azghar Hussain12-Jul-04 5:14

Azghar Hussain

12-Jul-04 5:14

Hi Everybody,
I would like to know how to find a substring in a string. finding should be done without case sensitive.
for example consider a string HomeWork.
I want to search wheather worK is there in the above string.
Let me know any function that perform this type of searching.
I tried strstr(), but it did not work because it is case sensitive.

Thanks in Advance.

palbano12-Jul-04 5:48

12-Jul-04 5:48

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__stricmp.2c_._wcsicmp.2c_._mbsicmp.asp[^]

Software development will be exponentially easier if you learn to use documentation.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

David Crow12-Jul-04 5:55

David Crow

12-Jul-04 5:55

DELIVER THE PROMISE wrote:
I tried strstr(), but it did not work because it is case sensitive.

So convert both to the same case and go from there.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Navin12-Jul-04 9:34

Navin

12-Jul-04 9:34

As DavidCrow said - probably the easiest way would be to make all strings the same case, and then compare. E.g., use strupr on the string and the substring, then do an strstr.

The other option is to write the search yourself. That actually would not be that hard to do, and perhaps that is the purpose of your homework anyway. Wink | ;)

"Fish and guests stink in three days." - Benjamin Franlkin