Mapping string into structure using C#

[rt]

Hello,

I was wondering if it is possible to create a structure which "overlays" a
string? For example, I have a string of formatted data and I would like to
map this string onto a structure to obtain the values. Below is an example
that contains only a few items but the "real thing" has around a hundred
items (I have no control of the input so changing it is not an option, I
just need to process it).

input string: "Item1BeginItem2ThisIsItem3"

Item1 is always 5 characters
Item2 is always 10 characters
Items3 is always 11 characters

struct MyMap
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=5)]
public string Item1;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=10)]
public string Item2;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=11)]
public string Item3;
};

Now, I'm not sure if it is possible to map the input string to an instace of
MyMap. Is there another option besides MarshalAs?

Thanks,

Rick

 

[Greg Ewing [MVP]]

rt, you can definitely do this if you can use unsafe code. Here's an old
discussion of how to go about doing it. It works very well and is faster
than parsing the string for sure.

http://groups.google.com/groups?hl=...TF-8&q=struct+overlay+string+c%23&sa=N&tab=wg

 

[Jeffrey Tan[MSFT]]

Hi,

Do you still have any concern?
Please feel free to let me know.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
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