Hex Conversion and Calculations

Andy

I am trying to create an encryption routine (although VERY basic I know), but
I am getting a "input string was not in a correct format" error and not sure
what I am doing wrong. All my variables are int. iNumber is the value
passed into the function. The error is happening on the first line of the
code posted below.

int iHex1 = (int)System.Convert.ToUInt32("&H10000000");
int iHex2 = (int)System.Convert.ToUInt32("&H100000");
..
..
..
iXORValue = iNumber ^ iKey;
iCheckSumTemp = iXORValue / iHex1;
iCheckSum = iCheckSumTemp % iHex1;
..
..
..
return iXORValue.ToString() + "-" + iCheckSum.ToString();

Thanks for any help
Andy

Nov 16 '05 #1

Subscribe Reply

7860

MuZZy

Andy wrote:

I am trying to create an encryption routine (although VERY basic I know), but
I am getting a "input string was not in a correct format" error and not sure
what I am doing wrong. All my variables are int. iNumber is the value
passed into the function. The error is happening on the first line of the
code posted below.

int iHex1 = (int)System.Convert.ToUInt32("&H10000000");
int iHex2 = (int)System.Convert.ToUInt32("&H100000");
Here's the error! Instead you should have:

int iHex1 = (int)System.Convert.ToUInt32("0xH10000000",16);
int iHex2 = (int)System.Convert.ToUInt32("0xH100000",16);

First, in c# you start a hex number from 0x, and second, you need to specify the number base,
which is 16.

God luck!
Andrey
.
iXORValue = iNumber ^ iKey;
iCheckSumTemp = iXORValue / iHex1;
iCheckSum = iCheckSumTemp % iHex1;
.
.
.
return iXORValue.ToString() + "-" + iCheckSum.ToString();

Thanks for any help
Andy

Nov 16 '05 #2

Mattias Sjögren

int iHex1 = (int)System.Convert.ToUInt32("0xH10000000",16);
int iHex2 = (int)System.Convert.ToUInt32("0xH100000",16); ^
Get rid of the H too.

First, in c# you start a hex number from 0x,

Right, but that doesn't really matter here since you're passing in a
string. So the calling language is irrelevant, what matters is that
the Convert APIs expect a 0x prefix.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

Nov 16 '05 #3

Andy

Thank you. That solved my problem

"Andy" wrote:

I am trying to create an encryption routine (although VERY basic I know), but
I am getting a "input string was not in a correct format" error and not sure
what I am doing wrong. All my variables are int. iNumber is the value
passed into the function. The error is happening on the first line of the
code posted below.

int iHex1 = (int)System.Convert.ToUInt32("&H10000000");
int iHex2 = (int)System.Convert.ToUInt32("&H100000");
.
.
.
iXORValue = iNumber ^ iKey;
iCheckSumTemp = iXORValue / iHex1;
iCheckSum = iCheckSumTemp % iHex1;
.
.
.
return iXORValue.ToString() + "-" + iCheckSum.ToString();

Thanks for any help
Andy

Nov 16 '05 #4

Similar topics

5081

XML dateTime conversion to DateTime.MinValue accross timezones

by: Symon R | last post by:

This is a bit of a weird one that I haven't yet been able to solve - I'm hoping someone out there can disprove my findings and tell me where I've gone wrong! I have designed a web service that...

.NET Framework

3779

problems with data type conversion (maybe)

by: CAFxX | last post by:

i'm writing a program that executes some calculations on a bitmap loaded in memory. these calculation ends up with pixel wth values far over 255, but i need them to be between 0 and 255 since i...

C / C++

322

SQL Server Conversion

by: neptune | last post by:

I've been reading the numerous posts on using SQL Server vs. Access, but still don't know if SQL server is right for my applications. I work in a section of a large corporate accounting department...

Microsoft Access / VBA

6572

double to int conversion yields strange results

by: Bjørn Augestad | last post by:

Below is a program which converts a double to an integer in two different ways, giving me two different values for the int. The basic expression is 1.0 / (1.0 * 365.0) which should be 365, but one...

C / C++

6463

why enum members need conversion

by: Nikhil Patel | last post by:

Hi all, I am a VB6 programmer and learning C#. I am currently reading a chapter on types. I have question regarding enums. Why do we need to convert enum members to the value that they represent?...

C# / C Sharp

1687

Type Conversion

by: Alphonse Giambrone | last post by:

How can I convert a string to a different type based on another string or other variable? For instance, instead of Dim i as Integer i = ctype("1000", Integer) I would like to do

ASP.NET

4436

Data-type conversion with Recordset - HELP!!

by: DBQueen | last post by:

I have a database where the user will have the opportunity to set up a number of Tests. I want the user to be able to enter the equation if a field for a particular test is to be a calculated...

Microsoft Access / VBA

2323

Violation of Conversion rule of C99.

by: Rajesh S R | last post by:

Isn't this code violation of C99 standard? #include <stdio.h> int main( void ) { float a = 0.7; if(a < 0.7) printf("Wrong"); else

C / C++

1674

Access conversion to .NET

by: sbowman | last post by:

I've seen a lot of tools out there that automatically convert Access apps to .NET. If anyone has used one, I'd like to know which one and what you thought of it. Are they really worth the money? ...

.NET Framework

3191

String to hexadecimal conversion

by: Praveena P | last post by:

Hi folks, I am new to Python... so am not too sure about how the type conversion works. I have to read a file that contains hexadecimal data and use the data further to do some arithmetic...

Python

7044

What is ONU?

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,...

General

7045

Problem With Comparison Operator <=> in G++

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,...

C / C++

7087

Maximizing Business Potential: The Nexus of Website Design and Digital Marketing

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...

Online Marketing

6741

The easy way to turn off automatic updates for Windows 10/11

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...

Windows Server

5341

AI Job Threat for Devs

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,...

Career Advice

4782

Access Europe - Using VBA to create a class based on a table - Wed 1 May

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...

Microsoft Access / VBA

4483

Couldn’t get equations in html when convert word .docx file to html file in C#.

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...

C# / C Sharp

2995

Trying to create a lan-to-lan vpn between two differents networks

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...

Networking - Hardware / Configuration

182

Comprehensive Guide to Website Development in Toronto: Expert Insights from BSMN Consultancy

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...

General