C / C++ / MFC

john john mackey27-Nov-01 10:01

27-Nov-01 10:01

That's what I thought and hence my (utter) bewilderment %-)

thanks, I'll keep trying.

Derek Waters27-Nov-01 11:15

Derek Waters

27-Nov-01 11:15

Just a thought, as this is a problem I have encountered myself. In the debugger, try seeing what sizeof(MY_STRUCT) is and compare it to what you're expecting. I've found that the program that generates the structured files can be using a pragma pack (see MSDN for details) might result in a different value of sizeof(MY_STRUCT) than another program that is not using it.

I believe that VC++ tries to align structures to 4-byte boundaries (not sure - I'd have to check MSDN) so if it is not packed, the sizeof call could return a value larger than expected.

Hope this helps.

------------------------
Derek Waters
derek@lj-oz.com

Todd Smith27-Nov-01 12:30

Todd Smith

27-Nov-01 12:30

To fix the byte alignment problem you can change the packing for your structure so the extra bytes are not added.

#pragma pack(push, 1)

typedef struct
{
 blah
} MY_STRUCT;

#pragma pack(pop)

Todd Smith

john john mackey28-Nov-01 12:25

ANSWER: Reading Binary Files - file ptrs

28-Nov-01 12:25

Thanks.

I am using a #pragma pack as follows:

#pragma pack (push, enterImportExport)
#pragma pack (2) // 1,2,4,8,16
// Restore enterImportExport settings at end of this header file.

typedef struct
{
blah,
blah,
} MY_STRUCT;

...
typedef struct
{
blah,
} ANOTHER_STRUCT;
...

// Restore enterImportExport settings.
#pragma pack (pop, enterImportExport)

I don't think I have tried all the alignment values (1,2,4,8,16), but byte alignment did pose a problem when I was reading another binary file using ANOTHER_STRUCT -- this works.

Thanks for the suggestions. Curious on results?

Johnny

john john mackey30-Nov-01 5:44

30-Nov-01 5:44

Ah!

I found my critical mistake. Yes, the byte-alignment would be an issue and I did account for this as my binary file read is based on a similar operation I performed successfully in the same application.

MY PROBLEM WAS in how I opened the file. I orginally was reading a text file and then when I changed to reading a binary file, I forgot to use the parameter in the fopen() statement:

fopen (sSourceFile,"rb") instead of just fopen (sSourceFile,"r")

Thanks for all those who offered help and advice.

Johnny Big Grin | :-D

CString question

RobJones27-Nov-01 9:42

RobJones

27-Nov-01 9:42

Hello,
What would be the easiest way to extract just a file name from a CString containing a full path and file name?.. I realize there are other ways of getting the file name besides parsing the string but for right now I need to extract the info from a string..

eg..
CString strPath;
strPath = "c:\\some path\\that could be deep\\this is\\file.txt";

What would be the best way to extract the "file.txt"? The problem I am having is the file is not all ways the same name and the path varies in length(depending where the file is located."

Thanks,
Rob

Rob Jones

john john mackey27-Nov-01 9:59

27-Nov-01 9:59

You may have got the answer already, but here is what I would offer:

pos = strPath.ReverseFind('\\') and
strPath.Right(pos)

It would be proper to test if strPath actually is in the format you expect, i.e. DriveName:\...\filename.extension

a slick routine would except:
c:\filename.ext
c:\dir1\filename.ext
filename.ext

Good luck.

Tim Smith27-Nov-01 10:01

Tim Smith

27-Nov-01 10:01

Take a look at the MFC routine AfxGetFileName. You probably can't use it directly, but you can lift the code and use it in your app.

Tim Smith
Descartes Systems Sciences, Inc.

Carlos Antollini27-Nov-01 10:05

27-Nov-01 10:05

You can USe _splitpath
Or if you want to use only MFC and CString
I will do this

strPath = "c:\\some path\\that could be deep\\this is\\file.txt";
strPath.MakeReverse();
strFileName = strPath.Rigth(strPath.Find('\\'));
strFileName.MakeReverse();

test because I wrote directly over CP....

Best Regards....

Carlos Antollini.
Sonork ID 100.10529 cantollini

RobJones27-Nov-01 10:16

RobJones

27-Nov-01 10:16

Thanks everyone!!

Rob

Michael Dunn27-Nov-01 14:31

Michael Dunn

27-Nov-01 14:31

Use PathFindFileName() from shlwapi.dll.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork - 100.10414 AcidHelm

switch statement

kpsr27-Nov-01 9:28

kpsr

27-Nov-01 9:28

Hi all!

I have enums defined in groups as shown below:
typedef enum myType
{

TYPE_UNKNOWN = 0,

// 1 - 19
TYPE_START = 1,
TYPE_OK,

// 20 - 99
TYPE_ERROR=20,
TYPE_BADDATA,
TYPE_BLAH

// 100 -- 199
TYPE_HELP1=100,
TYPE_HELP2,
TYPE_HELP3
}myType;

I want to use the switch statement which could break the above into certain range they fall in, instead of doing:
switch( nMyType )
{
case TYPE_UNKNOWN:
break;

case TYPE_START:
break;

case TYPE_ERROR:
case TYPE_BADDATA: // I dont want to list each and every case
// b'cause i will be having a lot of them at some point
break;

default:
break;
};

Rather, I am looking for something like:
switch( nMyType )
{

case TYPE_START to TYPE_OK: // ie. 1-19
// I will be calling appropriate routines to handle the explicit
// case
break;

case TYPE_ERROR to TYPE_BLAH:
break;

default:
break;
};

Currently I have a IF else condition for the above ranges, Just wondering can I have the range in a switch statement?

I'll appreciate any hint/help!

thx
kpsr

Re: switch statement

Carlos Antollini27-Nov-01 9:36

27-Nov-01 9:36

switch(n)
{
case 0:
DoSomething();
break
case 1:
case 2:
case 3:
case 4:
DoSomething2();
break;
}

Best Regards
Green Alien | [Alien]

and

for ever in CP

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: switch statement

kpsr27-Nov-01 10:31

kpsr

27-Nov-01 10:31

Carlos,

Didn't really solve my purpose.

As I said in my earlier message, I do not want to list out individual cases, since there will be a lot.
I want to get a range like,
if( n > 1 || n < 10 )
DoSomething(n);
else if( n > 10 || n < 200 )
DoSomething2(n);
else if( n > 200 || n < 300 )
DoSomething3(n);
else
DoSomething4(n);

But, was wondering If I could do it using the switch statement by any means?.

thx
kpsr

Re: switch statement

Carlos Antollini27-Nov-01 11:16

getting all filenames from a folder

27-Nov-01 11:16

You don't have condition in a Switch case. Only have values in the case...

The best is use
if(condition0)
{
}
else if(condition1)
{
}
else
{
}

I'm sorry...

Best Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Kuniva27-Nov-01 8:40

Kuniva

27-Nov-01 8:40

How can i get the names of all files in a specific folder? (in other words, how can i see what files are in a folder) (possibly with a filter to view only one type?)
P.S.: it has to be some sort of function that will return me the strings or give me a list or something, i'm not looking for the common open file dialog here Wink | ;)

Greats n kisses Poke tongue | ;-P

Kuniva

Re: getting all filenames from a folder

C^hris L^osinger27-Nov-01 8:53

C^hris L^osinger

27-Nov-01 8:53

here's a class to do it.

-c

Smaller Animals Software, Inc.

Re: getting all filenames from a folder

Carlos Antollini27-Nov-01 9:14