Converting managed int to unmanaged PBYTE?

[Tom Glenn]

I have a managed method that has an int parameter that has to be passed to
an unmanaged method that takes a PBYTE and associated length as a DWORD.

Anyone have any sample code that shows how to do this?

Thanks.

 

[Tomas Restrepo \(MVP\)]

Tom,

I have a managed method that has an int parameter that has to be passed to
an unmanaged method that takes a PBYTE and associated length as a DWORD.

Anyone have any sample code that shows how to do this?

#using <mscorlib.dll>
#include <windows.h>
#include <iostream>
using namespace System;

#pragma unmanaged
void f(LPBYTE buffer, DWORD size)
{
std::cout << "Buffer size: " << size << std::endl;
}

#pragma managed

__gc class A
{
public:
void Man(int n)
{
f( (LPBYTE)&n, sizeof(n) );
}
};

int main()
{
A* a = new A();
a->Man(12);
}

 

[Tom Glenn]

Thanks, how do you go in the opposite direction i.e. unmanaged to managed?
I can't seem to figure out how to take the length into account in this case.

 

[Tomas Restrepo \(MVP\)]

Hi Tom,

Thanks, how do you go in the opposite direction i.e. unmanaged to managed?
I can't seem to figure out how to take the length into account in this

case.

Not quite sure what you're saying here... care to explain what you want to
do exactly in the opposite case?