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

Thanks for any help
Andy

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

int iHex1 = (int)System.Con vert.ToUInt32(" 0xH10000000",16 );
int iHex2 = (int)System.Con vert.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.ToStr ing() + "-" + iCheckSum.ToStr ing();

Thanks for any help
Andy

[Mattias Sjögren]

int iHex1 = (int)System.Con vert.ToUInt32(" 0xH10000000",16 );
int iHex2 = (int)System.Con vert.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.

[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.Con vert.ToUInt32(" &H10000000") ;
int iHex2 = (int)System.Con vert.ToUInt32(" &H100000");
.
.
.
iXORValue = iNumber ^ iKey;
iCheckSumTemp = iXORValue / iHex1;
iCheckSum = iCheckSumTemp % iHex1;
.
.
.
return iXORValue.ToStr ing() + "-" + iCheckSum.ToStr ing();

Thanks for any help
Andy