Programming :: Create A Global Struct Variable With Predefined Member Values?

May 26, 2010

Is it possible to create a global struct variable with predefined member values?Only one instance of that struct is ever needed.

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General :: Assign Local Variable Values To Global Variable?

Feb 17, 2011

how to assign a local variable value to a global variable....

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Programming :: Stl Vector As A Member Of A Struct?

Jan 17, 2011

is there any problem that might rise by by having a vector as a member of struct in c++ as follows.ex.

struct A
{
int a;

[code]...

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Programming :: Sizeof Struct With Function Pointers As A Member?

Jul 2, 2010

I following structure
typedef struct
{

[code]...

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Programming :: Get Variable Values From Keyboard?

Jul 11, 2010

I have been reading the Wikibook on C Programming for quite some time and am up to the variable part. I did learn several new things, like that too many variables hog memory.

What I want to know is how to assign a variable to the keyboard (in the C/C++ family) as such that the user has to type it in.

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Programming :: Not Able To Invoke Variable Values / Sort It?

May 5, 2010

I am trying to import variable values from a profile file to a perl program.
I am using the below command for doing it.

Quote:

system (". /opt/bbfb/bin/setbbfbenv $codeset");

the above command does make variable values available to the running perl program..
Can some one help me on this front..

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Programming :: Fork() - Variable Values Between Child And Parent Process?

Feb 24, 2010

Code:

int main()
{
int pi;
int i=10;
pid=fork();

[code]....

Q 1. The value of the variable pid returned by the fork() function will be greater than 0 in the parent process and equal to zero in the child process? but during forking, there values are exactly copied so what's went wrong here?

Q 2. "changes to the variable in one process is not reflected in the other process" why it is so? >> Even if we have variable i declared as a pointer or a global it wont make a difference.

Code:

int main()
{
int i, pid;
i=10;
printf("before fork i is %d

[code]....

Q. Through this program it is clear that both process is using the data from the same location, so where's the original value is residing when the child process is in execution.?

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Programming :: Variable String File Base - Output File Doest Not Exclude The Values In Grep -av

May 1, 2011

My script.

This is may script:

Code:

Problem: Output file doest not exclude the values in grep -av

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General :: Bash Script - Forget Global Variable's Value?

Apr 9, 2011

I have a hard time with my bash script.

It forget global variable's value.

First look at my script.

Code:

Echo "PKGS is [$PKGS] in after loop"

And data file for it is below. Let's name as list.txt

Code:

As you see, PKGS variable in loop has correct value.

However, after loop I can not get proper value for it.

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General :: Use A Global Variable To Apply A Condition Within A Script

Feb 28, 2011

I'm trying to use a global variable to apply a condition within a script.

The idea is to use this variable set to e.g. 1 or 2 to run a different part of the script accordingly. I can set the global variable with e.g.

Code:
export WL0=1

run my part of script, increment it by 1 with e.g.

Code:
WL0=$((WL0+1))

but if I re-run the script my WL0 is still set to 1!

I've also tried to add an

export $WL0 at the very end of my script (after the math) but this doesn't change the global variable apparently.

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Programming :: Bash Script Predefined User Input

Aug 9, 2009

I have a script im having some problems with, what I need is to have the system generate a random password for me and use that password when creating new users to it.

System is Debian Lenny and script is in bash.

The program is znc. I have made it so that it will generate the random password on the shell but the problem is to use it in the bnc software.

To make a password there the command is znc --makepass and look like this:

My question is now if it would be possible to put in the script so it would "answer" when it need those passwords ? the random password that is generated is in a variable called $setpass and is NOT crypted.

Or is there any other software that would be able to generate that md5 string for me ?

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Programming :: If Statements With Decimal Places - Compare It To A Predefined Value

Aug 11, 2010

I'm writing an if statement where a variable is a number such as 14.05 (this is actually a temperature) and I want to compare it to a predefined value, sample code below:

Code:

I have all sorts of errors regardless of how I do this (double quotes, square brackets). The best idea I've had is stripping off the decimal place so it's a 4 digit number (e.g warning=1503 and DEV_TMP=1405) however this seems a little unnescessary and I'm sure there's an easier way of achieving the same thing.

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General :: Create An Environment Variable With The PRINTER Variable?

Apr 16, 2011

I am supposed to create an environment variable with the PRINTER variable, which should resolve to the word sales. Would the command be like this?: env PRINTER - NAME=SALES (is this the command to create that variable with resolving the word sales to it?)

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Programming :: STL Container Into A C Struct

May 23, 2011

I have an old C application in which i am trying to include some STL cointainers. When i use the STL container alone it works fine, but when i include it into a C struct i have segmentation faults errors. I know that it is not a good idea to mix C and C++. Considering this code:

Code:

typedef struct{
int shmid;
...
APPLSPACETYPE applSpace;

[code]...

and how to make a malloc for this issue; something like :

Code:

mem->applSpace.rData.completeGroups2zeroGroup=(map_completeGroups2zeroGroup_type *)malloc((sizeof(map_completeGroups2zeroGroup_type)+1)* sizeof(char ));

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Programming :: Use A Class Inside A Struct?

Apr 8, 2011

Is is possible to use a class inside a struct? I keep getting segmentation fault with this code:

Code:

struct my_struct {
unsigned count;
std::string msg;

[code]....

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Programming :: Difference Between Struct And Union?

Nov 6, 2010

I have been spending time (starting yesterday) reverse-engineering GTK+ to get my programming skills up. I came across a struct in the headers (_GtkArg, which was then typedeffed into GtkArg) that includes a union in it that has pretty much the same properties as a struct. Then, there was a struct inside the union.

I'm confused. Just what is the difference between a union and a struct?

P.S. I am using GTK's native C programming language.

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Programming :: Memory Allocation For Struct In C++?

Mar 30, 2010

How do we allocate memory of struct? what i did was

Code:

int main()
struct amp
{

[code].....

cout <<"The size of 'struct' is"<< sizeof(struct amp)<<"and it is located at"<<struct amp*s = malloc(sizeof(struct amp))<<endl;
it gives me an error---
In funtion 'int main()':
error: expected primary-expression before 'struct'
error: expected ';' before 'struct'

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Programming :: Python Serial And Struct On 64 Bit?

May 14, 2010

For a work project, I've got a bunch of python code from about a year ago that controls the movement of our EVI-D30 camera over a ttyUSB connection. It used to work fine on a 32-bit Fedora box, but recently we moved our whole project over to a 64-bit Gentoo server, and the same code seems to be worthless on the new platform. I didn't write the code, so I'm have trouble figuring out how to fix it. Error messages usually look like this:

Code:

File "./CameraController.py", line 172, in pan
turn_callback(cmdStruct[0], cmdStruct[1])
File "./CameraController.py", line 147, in turn_callback
cameras[camera].TiltUp()

[code]....

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Programming :: Access Value From Nested Struct <c Language>?

Mar 11, 2010

I having a nested structures which are referenced with pointer variables :

example :
typedef struct {
int a ;
char *b ;
int *c ;
}EXP2 ;

[Code]...

While trying to access the value of sv.exp2->a it throws segmentation fault error.How to acess this variable ??

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Programming :: Dereferencing Pointer To A Shared Memory Struct?

Feb 5, 2011

I have what should be a relatively simple program (fadec.c) that maps a struct from an included header file (fadec.h) to a shared memory region, but Im struggling accessing members in the struct from the pointer returned by shmat. Ultimately, I want to access members in the shared memory structure with a globally declared version of the struct, shm__. Not only do I not know how to accomplish that, but I cant even seem to access members of the shared struct directly from the pointer itself (compiler complains about dereferencing pointer to incomplete type). Im at a loss and could use another set of eyes if you guys dont mind taking a gander:

Compile Errors:
tony-pc:/cygdrive/p/test> cc -o fadec fadec.c
fadec.c: In function 'main':
fadec.c:30: error: dereferencing pointer to incomplete type
fadec.c:31: error: dereferencing pointer to incomplete type

[Code]...

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Programming :: Struct Timeval Doesn't Keep After Function Returns

Jun 2, 2010

int GetTime(struct timeval tv)
{
gettimeofday(&tv, NULL)
printf("%d
", tv.tv_sec); /* here is the right value */
return 0;
}

[Code]....

What happend? struct timeval has a self timer?

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Programming :: 'auto_ptr' Is Not A Member Of 'std'?

Nov 26, 2010

I am getting the following error:'auto_ptr' is not a member of 'std'This was working fine in gcc version 4.1.2 20080704 (Red Hat 4.1.2-48).After upgrading to gcc version 4.4.4 (GCC), it is NOT working.

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Programming :: Differences Between Ncurses Library And Termios Struct W.r.t Keyboard Reading

May 3, 2010

I want to read a pressed key or a combination of pressed keys from the keyboard and perform some action afterwords.

e.g.

Ctrl-Alt-F1

Out of ncurses lib. and the termios struct which can be used best for the above purpose and why ?I tried to search on Google, the differences between these two but couldn't get much !

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Programming :: Bash - Read Content Of File To Variable And Use This Variable In For Loop ?

Aug 21, 2009

I'm trying to read content of file to variable and use this variable in for loop. The problem is, when I have c++ comment style in file - /*. Spaces in line are also interpreted as separated lines.

For example:

Code:

Changing $files to "$files" eliminate these problems but causes that whole content of variable is treated as one string (one execution of loop).

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Programming :: Make A New Variable With The String From The Old Variable Btut Without Any Plus Sign?

Apr 7, 2010

my script has a variable which comes in the form +00.00 +0.00 -00.00 or -0.00 (the numbers can be any in that form) for any that have a + symbol I need to remove the +, but if it has a - symbol it needs to stay.

i need to make a new variable with the string from the old variable btut without any plus sign. I have tried a lot of different ways with no success, each thing I tried either left the + or removed the entire string. I think this should work but doesn't

foo=+12.40
bar=${foo#+}

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Programming :: C++ - Initializing Static Member Array?

Jun 7, 2011

The code below defines an array of structures in a class. I would like this to be a Static array and then initialize the array in a initialization method. I understand that initialization lists are the way to go but due to the size and complexity of the array I plan on using (the example below is a simple snippet that illustrates the problem) I would like to use the initialization method. However, I cant even get this thing to compile. The error says the reference to the ArrayOfStructs in the initialization routine is undefined.

l_long_Island

P.S. This is the error message

undefined reference to `ClassWithStaticArray::ArrayOfStruts'

class ClassWithStaticArray {
public:
struct IntegerStruct
{

[code]....

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Programming :: Kernel API *get_super (struct Block_device *bdev) Producing Error With Fedora Core 5

Feb 2, 2011

I understand that block_device pointer *bd sholuld get initialized. Program should produce initialization error for *bd. Compiler is producing '->'. I am not understanding why?

[code]...

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Programming :: Search Within A Variable And Assign The Results To A New Variable?

Apr 25, 2011

how I can search within a variable and assign the results to a new variable. I'll use the following as an example -

cars="Audi BMW Cadillac Chevy Dodge Ferrari Ford Mercedes"
list=`echo ${cars} | egrep -o '<A?+|<C+'`

with the echo command I get the following output assigned to list -

A
C
C

What I'd like to get for output is -

Audi
Cadillac
Chevy

how I could do this regardless of upper/lower case letters?

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Programming :: Getting Error While Accessing Inode Structure Member / Why Is This?

Dec 16, 2010

I have added new member "i_mymember" to inode on-disk structure in ext3_fs.h file and tried to access this in userspace program, but gives me error that "error: �struct ext3_inode� has no member named �i_mymember� "

I have compiled my kernel source code.

why this error is coming ...?

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Programming :: Access Inherited Member From Base Class?

Sep 14, 2010

I have a problem. This class is a base class for a basic enum handler:

Code:
#define ENUMOBJECT_BEGIN_ELEMENTS enum Element {
#define ENUMOBJECT_END_ELEMENTS ElementCount, DefaultElement, NoElement };

[code]...

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