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by: Geiregat Jonas |
last post by:
is using
if(open("file",O_EXCL) != -1){ printf("File does
exists")}else{printf("file does not exists"); }
a good way of checking if a file exists or not, if not how should I do it ?
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by: Bonjour |
last post by:
Hi everybody !
I' d like to check data before inserting.
Select @nb = Count (idCustomer)
From Customer
Where company like '%' + @company+ '%'
If "PEUGEOT SA" already exists, @nb > 0 if I enter "PEUGEOT".
On the other hand, if "PEUGEOT" exists, @nb =0 if I enter "PEUGEOT SA".
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by: CES |
last post by:
I'm sorry for the 101 question but I can't seem to get this to work... I'm
tiring to test if a cookie has been created before.
Everything I've seen indicates that Request.Cookies works the same in .net
as it did in old asp but for some reason I'm getting
"System.NullReferenceException: Object reference not set to an instance of
an object" when ever I attempt to test for the cookie . It doesn't return an
error if the cookie exists but...
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by: Darrel |
last post by:
I'm trying to add an extra layer of error checking on a Drop Down List. The
list is populated from one table, and then I select the selectedValue from
another DB.
While it SHOULDN'T ever happen, just incase, I want to check that the
selected value actually exists as a value in the dropDownList before I
actually try to select it.
I've tried this:
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by: RSH |
last post by:
I am using code to create a new modal form from a parent form. It is not an
MDI form. I need to know if an instance of the form already exists so when
the user clicks on the button I can close any previous version of the form.
Here is the code I am using to create the form:
frmFindReplace frmFind = new frmFindReplace();
frmFind.Show();
frmFind.PrepareForm(this.dataGridView1);
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by: brett |
last post by:
If I participate in a forum that doesn't have any way to watch threads
or any type of RSS, I could get the filesize of the thread I want to
watch. When the filesize changes, I know there is a new post. Are
there any reasons why this won't work?
If the above will work, how is it different from using RSS? Or can RSS
support just a regular page (no XML for RSS available)?
Thanks,
Brett
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by: Phil Latio |
last post by:
I am inserting data into user table which contains 5 fields, sounds simple
enough normally but 2 of the fields are designated as UNIQUE. If someone
does enter a value which already exists, how do I capture this specific
error?
Would it make more sense to actually run a SELECT query first and if that
returned a result, then I use that for error checking and don't run insert
until select returns nothing?
Cheers
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by: sprash |
last post by:
Newbie question:
I'm trying to determine if a file physically exists regardless of the
permissions on it
Using File.Exists() returns false if it physically exists but the
process does not have the necessary permissions.
One hack could be to check for length and that would throw a
FileNotFoundException ...but there is got to be a better way!
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by: Brad Pears |
last post by:
I want to check to see if a particular object exists using vb.net 2005.
I have a class called clsContract. When the user clicks the 'New Contract'
button, I want to check to see if a clsContract object already exists and if
so what the state of that object is before doing anything else.
I thought I could use ...
if IsNothing(clsContract) then
'somc code
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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: 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: 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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