[VC 2k5] Q:Copying From unmanaged pointer into managed arrary, How?

[Marauderz]

Hi there,

Got a quick question, I have an app that I'm compiling with /clr and I have
a native function that passes in a pointer, and I need to copy from that
unmanaged memory into a managed Byte array but I can't quite figure out how
to properly cast everything, here's what I have right now.
static void CopyData(const void* buf, int size)
{
System::IntPtr^ ptrBuf=gcnew System::IntPtr((int)buf);
array<System::Byte>^ MyBuf=gcnew array<Byte>(size);
System::Runtime::InteropServices::Marshal::Copy(pt rBuf,(array<unsigned
char>^)MyBuf,0,size);
}

I'm getting an error that's saying none of the 16 overloads could convert
all the argument types.

So I'm guessing I am most likely not casting the destination buffer to a
correct type? I've already tried using Byte for my array but alas my weak
C++ skills just ain't helping.. :P Can anyone tell me where I'm going wrong?

[JAL]

Marauderz.. How about:

Marshal::Copy(static_cast<IntPtr>(ptrBuf),MyBuf,0, size);

Jeff

"Marauderz" wrote:

Hi there,

Got a quick question, I have an app that I'm compiling with /clr and I have
a native function that passes in a pointer, and I need to copy from that
unmanaged memory into a managed Byte array but I can't quite figure out how
to properly cast everything, here's what I have right now.
static void CopyData(const void* buf, int size)
{
System::IntPtr^ ptrBuf=gcnew System::IntPtr((int)buf);
array<System::Byte>^ MyBuf=gcnew array<Byte>(size);
System::Runtime::InteropServices::Marshal::Copy(pt rBuf,(array<unsigned
char>^)MyBuf,0,size);
}

I'm getting an error that's saying none of the 16 overloads could convert
all the argument types.

So I'm guessing I am most likely not casting the destination buffer to a
correct type? I've already tried using Byte for my array but alas my weak
C++ skills just ain't helping.. :P Can anyone tell me where I'm going wrong?

[JAL]

Better yet, just create ptrBuf as a value:

System::IntPtr ipBuf((int)buf);

since IntPtr is a value type.

"JAL" wrote:

Marauderz.. How about:

Marshal::Copy(static_cast<IntPtr>(ptrBuf),MyBuf,0, size);

Jeff

[Marauderz]

Hey, that worked. Thanks!
"JAL" <JA*@discussions.microsoft.com> wrote in message
news:66**********************************@microsof t.com...

Better yet, just create ptrBuf as a value:

System::IntPtr ipBuf((int)buf);

since IntPtr is a value type.

"JAL" wrote:

Marauderz.. How about:

Marshal::Copy(static_cast<IntPtr>(ptrBuf),MyBuf,0, size);

Jeff