pointer for C# connecting to Java

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I have written JvmConnector to launch JVM to execute codes in some jar packages.
Here is my project on SourceForge.
However I don't know how to transport variable pointer directly to unmanaged functions.
I try the code:

[DllImport("xxx")]
public static extern void yyy(ref int addr, object x);

And in xxx.dll:

void yyy(int* addr, int* x) {*addr=(int)x;}

But it works strangely.
Though I know there is a dynamic memory world in C#, I think it must have a way to get address of variable, because it is really stored in memory.
And could you help me?
Thank you.

Posted 30-Apr-11 20:34pm

dna2codeproject

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2 solutions

Solution 2

Checkout references to pinned memory and unsafe mode in C#. There is probably a CodeProject article on the subject.

Posted 30-Apr-11 21:48pm

Richard MacCutchan

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Kim Togo · Accepted Answer · 2011-04-30T20:52:00

Solution 1

You may already know Marshal Class[^] and Interop services for C#. Also try to take a look at http://pinvoke.net/[^] - Perhaps you can find you can finde inspiration ?

Have look at Pointer types (C# Programming Guide)[^] ?

Posted 30-Apr-11 20:52pm

Kim Togo

Updated 30-Apr-11 21:24pm

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Comments

dna2codeproject 1-May-11 3:11am

Thank you for your answer. However Marshal just helps me to copy all data to memory and then I get an IntPtr to handle them. But I really want to know how to get a pointer to my data(not the duplicated one) in IL virtual machine directly...