[Mono-list] Fast Passing Strings to Interop without Marshaling

[Bradford Stephens]

I believe you still have to use the Marshaling in order to get an IntPtr.

On Mon, Nov 3, 2008 at 12:55 AM, Alan McGovern <alan.mcgovern at gmail.com> wrote:
> What would happen if you passed the string as an IntPtr type rather than a
> char* type?
>
> Alan.
>
> On Mon, Nov 3, 2008 at 8:29 AM, Chris Howie <cdhowie at gmail.com> wrote:
>>
>> On Mon, Nov 3, 2008 at 2:48 AM, Bradford Stephens
>> <bradfordstephens at gmail.com> wrote:
>> > We're passing very large strings to a C program in Linux through Mono
>> > via Interop. The C program takes a (char*), and our C# program uses a
>> > String.
>> >
>> > The problem is that these strings can be 100kB+, and there seems to be
>> > a large performance impact. Often, just passing the string along takes
>> > over 150 milliseconds.
>> >
>> > Any suggestions on how to do this faster? Can I pass a reference to
>> > the string or some sort of char array without Marshaling it? I'm
>> > pretty sure the performance hit comes from copying everything during
>> > the marshaling process. I know it can be a tricky problem because C
>> > chars are 1 byte, and C# are 2.
>>
>> This is not possible unless you are storing your string in C# as byte[]s.
>>
>> --
>> Chris Howie
>> http://www.chrishowie.com
>> http://en.wikipedia.org/wiki/User:Crazycomputers
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>
>