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How do you think 8 bit processors handled 16 bit integers?
It's not difficult: you just have a half carry in the middle!
0x1234 + 0x6743
is worked out in 8 bits as:
0x34 + 0x43 == 0x77 plus a zero carry
and 0x12 + 0x67 + 0 == 0x79
== 0x7977
It's not done quite that way with decimals (because floating point arithmetic is a lot more complex) but that's the general idea.
Think about it: you are a base ten processor: but there is no limit on how big a pair of numbers you can do arithmetic with!
You looking for sympathy?
You'll find it in the dictionary, between sympathomimetic and sympatric
(Page 1788, if it helps)
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You had me at
OriginalGriff wrote: how big a pair
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Clubs?
Spades?
:InnocentWhistleSmiley:
You looking for sympathy?
You'll find it in the dictionary, between sympathomimetic and sympatric
(Page 1788, if it helps)
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At clubs usually. As for the other, I hesitate to use such language.
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Grief! That's a term I hadn't heard or thought about for decades.
I assumed that died in the 70's!
You looking for sympathy?
You'll find it in the dictionary, between sympathomimetic and sympatric
(Page 1788, if it helps)
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Yeah, it's not used so much anymore. It appears in "Streets of Fire" (circa 1984) and if I recall correctly, Bill Maher used it a while back.
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It's not a type directly supported with processor instructions dedicated to it. You can look at its source[^] to see how it works (does not include the source of some math operations and so on, but shows their function names).
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You may be confusing addressing space with data size.
A 64-bit computer can address 264 bytes. An instance of a 128 bit decimal type (located somewhere in the address space) occupies 16 bytes.
/ravi
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computerpublic wrote: Somehow the logic doesn't seem to come to me
Might help if you wrote your own class to do infinite digit integer handling. So you want a class that can take a 50 digit integer and add a different 50 digit integer to it. Each class instance represents a single number. So the add operation would look like the following.
MyInt op1 = new MyInt("1000....001");
MyInt op2 = new MyInt("9000....019");
MyInt result = op1.add(op2);
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Please if anyone has worked with SecuGen SDK please let me know how you saved your template information to a file or database.
I will be very grateful.
thanks
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I did write to them, they said that the template is saved in RAM. So I do I retrieve it from the RAM buffer and save to database or file. If you have any idea please let me know.
Hoping to hear from you.
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How is it stored in RAM, do you have its address and length, do you know where it must be placed for your application to work properly? After all data in RAM is just a collection of bytes, easy to write to a file or save in a database, just the same as any other known piece of information.
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@Richardd. Please am really grateful for your assistance, the fingerprint template is a byte array, and 400 in size.
Any c# code to save such an information to a file or database will be very helpful. This is all I need to finish my project.
Thanks so Much.
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Use File.WriteAllBytes()[^] to write, and File.ReadAllBytes()[^] to read. Note, this is a simple-minded write and read and assumes the data is just a bunch of bytes that can be read back and reused without any special processing.
/ravi
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Thanks for your reply. I wrote it to a text file. Now converting this cryptic byte to a form that I can save in a database is the challenge am facing as am writing this this to you.
I will appreciate if you can still help.
Thanks
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Can I write the byte directly to a database.
If yes how.
If no, how can I convert the byte in the file to a form that I can save to the database
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Yes, you can, to a column of type binary or varbinary. The former is used to store fixed length blobs while the latter is used to store blobs of varying length.
/ravi
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code for how to check if a file is encrypted in c#
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It is not really possible to tell if it's encrypted since, if it is done properly, there is not information in the file about the encryption method or keys. And a file is just a stream of bytes, so an encrypted file looks just the same as an unencrypted one.
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I've got an WPF application (without MVVM or similar), using EF6 (via a OData Webservice) and I wondering whats the best place to update some 'audit' fields.
i.e. one entity looks like
public class ActionStatus
{
public int Id {get;set;}
public string ActionStatus{get;set;}
[DataType(DataType.Date)]
public DateTime ValidFrom { get; set; }
[DataType(DataType.Date)]
public DateTime ValidTo { get; set; }
public string ChangedBy { get; set; }
public DateTime ChangedOn { get; set; }
}
So on the WPF side I've got this displayed in a DataGrid, which saves the data back etc, all good so far.
For the ChangedBy and ChangedOn fields I want the 'system' to update these as required.
But I'm not sure where it would go!
Doing it on the DataGrid events, seems very wrong...far too late, and would need to be done differently if I didn't use a datagrid in the future.
The other places, are the OData WebService, the EF Model, or in the entities themselves, or maybe as another part of the 'system', not sure...
I presume that this is one of the 'lots of solutions/it depends' type of problems, but some guidance would be helpful.
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That's not an audit-trail, but an indication who made the last change. It'd be an audit if it is a complete trace.
cjb110 wrote: .far too late, and would need to be done differently if I didn't use a datagrid in the future.
The database - that way it won't matter whether it's a webservice, a WinForm or any other UI/app reading from the database.
I'd recommend implementing the bare necessities, and nothing more.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Eddy Vluggen wrote: That's not an audit-trail, but an indication who made the last change.
heh, I realise, couldn't think of a better term for it.
Eddy Vluggen wrote: The database - that way it won't matter whether it's a webservice, a WinForm or any other UI/app reading from the database.
As EF is 'creating' my database, and with migrations keeping it up to date, does that mean I add it there as C# code?
Or somehow make the migrations side run additional sql to either add trigger or constraint etc?
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