C++ :: Access Variable Updated In One To Another CPP File?

Dec 18, 2012

I have two cpp files.I m updating a value of an integer in one cpp file and i want to perform a specific function in the second file as per to the value updated in the first file. ie I m initialing the variable in the constructor. I have two buttons in the first cpp file. On clicking the first button I m updating the variable as 1 and on pressing button two , I m updating the variable as 2. I m retrieving this variable in the second cpp file with respect to the object created for the class in the first cpp file.

The problem is that i m not able tot retrieve the updated value in the second file. only the initialized value is being retrieved. neither 1 nor 2 is updated.

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Visual C++ :: Use CEdit Control Variable Updated From Tab To Dialog Box?

Jun 24, 2014

I have one Tab called Tab4 and one main dialog box called CGrabDlg. The values of my variables are not updated when I change them.?

Here my constructor of my Tab :

Code:
CTab4::CTab4(CWnd* pParent /*=NULL*/)
: CDialogEx(CTab4::IDD, pParent )
, iFilter1(_T("F1_350"))

[Code]....

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C/C++ :: Access Variable Using Extern In A Particular File

Sep 2, 2013

I have 3 files: f1.c f2.c and f3.c

I have declared variable int a; in f1.c and int a; in f2.c.

Now I want to use the variable int a; in f3.c . But this variable corresponds to the variable in f2.c .

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Jun 19, 2014

I want to update a file but I want to show the percentage when it is being updated. How can I do this? Do I need to use threads?

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Jul 17, 2014

Code:
#include <iostream>
using namespace std;
void f();
extern int x;
int main() {

[Code] .....

x is declared outside the functions and defined inside main(). Then why this code produces a compile error?

x is already declared so it can be used in f(); and when I call f(), x is already defined. Then why can't f() sets the value of x (in main) to 10?

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C++ :: How To Access Variable In Different Class

Oct 22, 2014

how can I make the queue of type pcb

and how to access pid in other clases?

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C :: Variable Access Across Multiple Files

Sep 7, 2013

I was trying out programs based on extern and as i understand, this is useful when accessing variables across multiple files having only one definition. But i tried a simple program as below without "extern" and thing seem to work when i expected it would fail during linking process

Code:
file5.c
1 #include <stdio.h>
2 #include "var.h"
3
4 int main() {
5
6 printf("
File5.c a = %d", a);

[Code] .....

As i have included "var.h" in all header files without extern, "int a" would be included in both the .c file and during linking, compiler should have thrown a warning or error message but it compiles file without any issue. Shouldn't var.h have the following "extern int a"?

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C++ :: Access Private Member Variable

Apr 3, 2013

I've created a class called Voter with a private member variable ID, also I have a variable in my main function to be ID as well. I'm trying to compare the two ID's but when I do so:

if (ID == V.ID)

I get the error - 'std::string Voter::ID' is private within this context.

I know that because it's private I can't access it, but how do I?

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C++ :: Access Variable From Other Scope Without Global Declaration?

Aug 8, 2013

Code:
#include <iostream>
using namespace std;
void f() {
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}

int main() {
int y=23;
//cout<<f::x<<endl;

I want to access x from f scope is there any way for this without global declaration? specially about function scopes...

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C/C++ :: Pointer Value Not Getting Updated

Mar 25, 2014

This is the code i have:

Spoiler

#include <iostream>
using namespace std;
class Node {
private:
int value;
Node* left;
Node* right;

[Code] .....

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C/C++ :: (OpenGL) Drawing Not Updated When There Is Conditional In Code

Aug 1, 2014

I'm making a program to draw a trajectory, was using as a basis the tangent, but when I put 90 degrees, the tangent is very large, so I thought of putting an if (angle == 90) did not use the tangent.

the design is right, but after choosing it 90 degrees it stops to draw.

for example

1-30 degrees - draws
2-45 degrees ---- draws
3 draws -90 degrees ---
4-60 degrees --- not drawing
5 --- 80 degrees --- not drawing
*
*

making routine design is presented below:

void Draw() {
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINES);
convert(graus);
if (ant){
x=xx;
y=yy;

[code]....

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C Sharp :: Data Is Not Getting Updated In Dropdownlist Using Dataset

Nov 26, 2013

Data is not getting updated in dropdownlist using data set:

 protected void SpecificationNameDropDownList_SelectedIndexChanged(object sender, EventArgs e)  {
            if (SpecificationNameDropDownList.SelectedItem.Text != null) {
                SpecificationValueLabel.Visible = true;
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[code].....

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C Sharp :: Datagridview And Listview Refresh After Data Getting Updated

Jan 9, 2013

                //user list view
                da = new SqlDataAdapter("SELECT * FROM [user]", con);
                DataTable t = new DataTable();
                ds = new DataSet();
                da.Fill(ds);
                 t = ds.Tables[0];
                listView1.View = View.Details;

[Code] ....
 
I tried with datagridview.refresh, update but its not working can any body sugesst me what to do for refresing the data ....do timer we have to use..? if yes then how ...?

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Visual C++ :: Access Variable Inside Class From Other Class

Nov 9, 2013

I am trying to access a variable from another class through another class but it is not returning its "instance"?

Example:
Class View

Code:
...
V3D_Viewer viewer;
...
Class MainWindow

Code:
...
viewer* myView;
myView = new viewer();
...
Class Test

Code:
...
MainWindow window;
window.myView->setBackgroundColor(WHITE);
...

I am new to c++ references and pointers,

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May 13, 2015

I have a CMFCToolbar containing a CMFCComboBoxButton which needs to be updated via a view. The view correctly updates the selection of the ComboBoxButton however the edit window is not updated until the control receives the focus or the entire window is redrawn.

How can I force the redrawing of the control to show the updated selection via the view

TextEditView::OnUpdateFontBox(CCmdUI *pCmdUI) routine?

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Feb 17, 2015

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C++ :: Access Private Data Of Base Class Without Access Modifier

Sep 9, 2013

if we don't provide the acces modifiers for base class and we need to manipulate the private data of base class in derived class. Is there anyway to acces the private data members? Here's a coding example

class A {
private :
int a;
};
class B : public class A {
public :
void displayA() { cout<<a<<endl; }
};

how i can acces the a of base class A in derived class B without acces modifiers.

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Jun 29, 2014

Is it possible to access file properties from c++ program? For example, user could drag file to program and then it displays a detailed information about file like date modified, size, type and etc..

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C :: How To Access Name And File Name Members

Sep 8, 2014

How to access the name and file name members on line 42 and 43?

Code:

typedef struct {
char * name;
char * filename;
} FILES;
FILES * files[256];
}

[code]...

How to access the name and filename from within function?

*files[count].name = chTmp;

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May 21, 2013

How to access a method from a .h file in another .cpp file

Code:

// main.cpp

#include <iostream>
#include "inc/one.h"
using namespace std;
int main( ){

School Tadd;
Tadd.AddTeacher(1);
return 0;

[Code] ....

When I compile , i am getting the below error

In function main:
undefined reference to `School::AddTeacher(int)'
Build finished: 1 error

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Apr 20, 2014

My problem: I want to make an application that is going to block the action of some files (It is anticheat files actually).

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Maybe there is another way to do that? I need to use Cheat Engine in game, and anticheat blocks it, so I thought if I'll block the activity of the anticheat it couldn't detect the Cheat Engine...

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C :: Updating Record In Random Access File

Nov 5, 2014

I have been searching through the forums and found a couple snippets of code and from that i came up with this. What i want to do is search for the specific movie code and then update the movie status from inactive to active (for argument sake).

Code:
#include <stdio.h>
#include <stdlib.h>

typedef struct SYSTEM_MOVIE{
int movie_code;
int movie_dur;
char movie_title[25];

[Code] ....

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Aug 27, 2014

I want to delete the folder from the file system, but I am getting error of access permission.

I want to change the permission of the folder so my program can delete it.

The problem I am facing on google search is I am getting results mostly for MFC code which is windows specific. However, I want to write a code in core C++ that works on all platforms like unix and windows.

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C Sharp :: How To Access Raw Image Data In Resource File

Nov 14, 2012

I have a .png file that my console app reads and puts into a structure that is saved as a file. The png is always the same so I thought I could just add it as a resource image to a resource file so it would be included in my program and not as a separate file. When I did that, the png shows up as a "SystemDrawingBitmap". If I examine this resource in a watch I see "Base" and "Static" members. Expanding those properties does not give me anything useful such as a pointer to the raw png data and its length in bytes.

If worse comes to worse, I can always make a hex dump of the png contents and then put the hex code into a CS file using static initialization.

Surely there is some way I can access the raw data internally and read the bytes into a byte array using C#

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C :: Search A File For Specif Data And Update It (random Access)

Nov 9, 2014

The file name is "movie.dat" and currently i was able to save data into the file in this order:

[movie_code] [movie_dur] [movie_title] [movie_rating] [movie_dir] [movie_genre] [movie_status]

[12345] [120] [Movie] [PG13] [Director] [Comedy] [Active]

I want to search for the "movie_code" and change the [movie_status] from Active to Inactive.

So lets say for example i have a movie code 12345 saved in my movie file. I want to change the value from "Active" to "Inactive"for argument sake.

This is the code i was trying to do it with:

Code:
FILE *movie_fp;
movie_fp = fopen("movie.dat", "r+b");
int m_code;
MOVIE movie_data;
printf("*** Welcome to the movie updater! ***

[Code].....

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C# :: Upload MS Access Database File To Server From Client Program

Sep 29, 2012

i have to upload a ms access database file to the server from my client program. The server program should connect to this database and read the data. What's the easiest way to upload the file? Is it FTP? i tried sockets, but it only allows like 9kb of data transfer capacity.

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