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by: John Ratliff |
last post by:
I have a few global variables in my app. They are defined in the main
application class file and declared (extern) in a header which can be
included by anyone who would want to use these variables.
Two of the globals are pointers which are initialized at runtime. The others
are classes whose values are initialized in the global space. When I had
just the pointers, I didn't need to include the extern header in the
defining class file. But...
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by: Mark A. Gibbs |
last post by:
I have a question about mixing C and C++.
In a C++ translation unit, I want to define a function with internal
linkage and C calling convention. Here's a sample of what I want to do:
// main.cpp
// This is defined in a C module
extern "C" void fake_qsort(void*, std::size_t, std::size_t,
int (*compare)(const void*, const void*));
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by: ccwork |
last post by:
Hi all,
I am reading "C: A Reference Manual" 4th ed and I get lost for the
"extern". It says that global object without specifying the
storage-class specifier will have "extern" as the default storage-class
specifier. My (little) C experience tells me that an object with
"extern" is to let the linker knows that the object is referencing the
object defined in somewhere, and this "somewhere" object does not have
the storage-class specifier...
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by: Tapeesh |
last post by:
I would like to know what is the expected behaviour of C compilers when
an extern decleration is intialized.
When the following code is compiled using gcc
//File extern.c
int arr ;
int a ;
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by: Maarten |
last post by:
Hi all,
I' facing a problem here that i am stucked with since i started with.net
in vb6.0 i used for example Form1.txtName.text = "test"
in vb.net i used DirectCast(Me.MdiParent,
Form1).txtName.text = "test"
and in C# i use ?
i have a settingsform where users can make changes of in and output's
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by: Jay Patel |
last post by:
Hello,
I need to write visual basic.net code to interface with a Mettler
Toledo Shipping Scale that interfaces with a PC via USB or a serial
port. I have seen example code on how to communicate via a serial
connection (RS-232), but am not sure as the process if it is connected
via USB. Is the USB port seen then as a COMM port, or is there a
different type of connection a USB port creates that I would have to
open? The scale will take as...
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by: Christian Christmann |
last post by:
Hi,
I've tree questions on the storage class specifier "extern":
1) Code example:
int main( void )
{
int b = -2; // my line 3
if ( a ) {
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by: bob |
last post by:
Hi,
we're faced with a horrible scenario whereby we are not able to access
exported classes in a DLL due to cross compiler issues.
Traditional approaches such as using extern "C" and LoadLibrary
(nothing to do with C++ I know but I'll get to my question... :).
Anyways, we need to access our exported objects and the only safe
route I know to get to the destination dll/lib from our client (not in
same environment) is by using extern "C"...
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by: dipalipatel |
last post by:
Hi,
I have to develop an application in .NET to communicate with My weight HD series Scales.
As soon as i put soming on my scale it will read the Weight and Send to my application and store in one variable.
It is connected with Com1.
Please, Can anyone help me with this?
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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