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by: _ivan |
last post by:
Hello,
So I think the answer to this question is going to be rather simple.
Basically I have a pointer to a class, and I want to have a function
to call to initialize it.
After this function is called, the pointer is still NULL.
Here is a simplified version, but basically the same:
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by: Niall |
last post by:
I have an unmanaged C++ ray tracer which I am working to put a C# front end
on. It runs fine as just the unmanaged code. I have made a MC++ wrapper DLL
to expose the required types to the C# project. Things seem to be getting
through from the unmaged side to the managed side - the image is being
rendered correctly. However, at random points, calls to new are returning
null. Hence, when the managed type gets destroyed and calls delete on its...
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by: Sheri |
last post by:
I have a VB .NET program invoking C++ code through a dll. Calling cout
generates "Unhandled Exception: System.NullReferenceException: Object
reference not set to an instance of an object". A line in ostream header
file is causing this error.
I used vbc to build my VB dll. Am I just missing a dll to link in iostream
functions?
#include <iostream>
cout << __FUNCTION__ << " exiting prematurely due to errors\n";
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by: Ralf Goertz |
last post by:
Hi,
this might be intentional, but I don't see a reason, why.
Running the program
----------------------
#include <iostream>
using namespace std;
int main(){
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by: Denis Petronenko |
last post by:
Hello,
in the following code i have segmentaion fault instead of exception.
Why? What i must to do to catch exceptions in such situation? Used
compiler: gcc version 3.3.6 (Debian 1:3.3.6-13)
int main()
{
try{
int* p = NULL;
*p = 4;
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by: sandy |
last post by:
I need (okay, I want) to make a dynamic array of my class 'Directory',
within my class Directory (Can you already smell disaster?)
Each Directory can have subdirectories so I thought to put these in an
array. The application compiles but aborts without giving me any useful
information.
What I suspect is happening is infinite recursion. Each Directory
object creates an array of Subdirectories each of which has an array of...
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by: MikeT |
last post by:
This may sound very elementary, but can you trap when your object is
set to null within the object?
I have created a class that registers an event from an object passed
in the constructor. When my object is destroyed, I want my object to
un-register this event. If I don't then the object would never be
destroyed until the object I passed in the constructor is destroyed.
I have implemented a Dispose(), Dispose(bool), and ~Finalize...
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by: valentin tihomirov |
last post by:
As explained in "Using pointers vs. references"
http://groups.google.ee/group/borland.public.delphi.objectpascal/browse_thread/thread/683c30f161fc1e9c/ab294c7b02e8faca#ab294c7b02e8faca ,
the pointers are allowed to be null, while references must refer an existing
variable of required type. The null is normally used for making optional
parameters. But there is no way to pass null reference in C#. Something is
missing.
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by: Saeed Amrollahi |
last post by:
Dear All
Hi
I have learned when an object is big, I should pass the object using a
reference or pointer to it rather than calling by value.
In the following code, I don't gain cosiderable performance with call-
by-reference vs. call-by-value. Indeed, the perforamnce is absolutely
unconsiderable:
#include <vector>
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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: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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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: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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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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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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