How do I convert IntPrt data to byte[]?

[=?Utf-8?B?UHVjY2E=?=]

Hi, I'm using VS2005, .net 2 and C# for windows application. I need to
convert a IntPtr to a byte[] to be able to add a meetingBlob data to the
meeting class object in Active Directory schema. I get a "unspecifie d error"
if I tried to add the data before converting to a byte[] in
"deNewContextOb ject.Properties["meetingBlo b"].Add((object)bl ob.pData);".

public struct Blob
{
public IntPtr pData;
public int nLength;
public int nSize;
}

int nBytes = Marshal.SizeOf( typeof(CUnityDS .Blob));
IntPtr ptr = Marshal.AllocHG lobal(nBytes);

// create an instance of the Blob structure
CUnityDS.Blob blob = new CUnityDS.Blob() ;

// copy and pin the structure to that location
Marshal.Structu reToPtr(blob, ptr, true);

// Pass it by reference
// OK, now it's time to "reconsitut e" the structure
blob = (CUnityDS.Blob) Marshal.PtrToSt ructure(ptr,
typeof(CUnityDS .Blob));
CUnityDS.DE_ERR ORS errcode = CUnityDS.DE_ERR ORS.DE_MEMORY_A LLOCATION_FAILU RE;
//EncodeAsnUser is a C unmanaged code that puts data from userContextData
struct to IntPtr
errcode = CUnityDS.LibWra p.EncodeAsnUser (ref blob, userContextData );
//Getting unspeficied error with the following line becuase it needs a
byte[] and not IntPtr
deNewContextObj ect.Properties["meetingBlo b"].Add((object)bl ob.pData);
--
Thanks.

[Lit]

System.Runtime. InteropServices .Marshal.Copy(I ntPtr source, byte[]
destination, int start, int length)
"Pucca" <Pu***@discussi ons.microsoft.c omwrote in message
news:B1******** *************** ***********@mic rosoft.com...

Hi, I'm using VS2005, .net 2 and C# for windows application. I need to
convert a IntPtr to a byte[] to be able to add a meetingBlob data to the
meeting class object in Active Directory schema. I get a "unspecifie d
error"
if I tried to add the data before converting to a byte[] in
"deNewContextOb ject.Properties["meetingBlo b"].Add((object)bl ob.pData);".

public struct Blob
{
public IntPtr pData;
public int nLength;
public int nSize;
}

int nBytes = Marshal.SizeOf( typeof(CUnityDS .Blob));
IntPtr ptr = Marshal.AllocHG lobal(nBytes);

// create an instance of the Blob structure
CUnityDS.Blob blob = new CUnityDS.Blob() ;

// copy and pin the structure to that location
Marshal.Structu reToPtr(blob, ptr, true);

// Pass it by reference
// OK, now it's time to "reconsitut e" the structure
blob = (CUnityDS.Blob) Marshal.PtrToSt ructure(ptr,
typeof(CUnityDS .Blob));
CUnityDS.DE_ERR ORS errcode =
CUnityDS.DE_ERR ORS.DE_MEMORY_A LLOCATION_FAILU RE;
//EncodeAsnUser is a C unmanaged code that puts data from userContextData
struct to IntPtr
errcode = CUnityDS.LibWra p.EncodeAsnUser (ref blob, userContextData );
//Getting unspeficied error with the following line becuase it needs a
byte[] and not IntPtr
deNewContextObj ect.Properties["meetingBlo b"].Add((object)bl ob.pData);
--
Thanks.

[=?Utf-8?B?UHVjY2E=?=]

Thank yuou Lit. The blob is returned to me but the length is not set. How
can I get the length of the IntPrt for the parameter? Thank you.
--
Thanks.
"Lit" wrote:

>
System.Runtime. InteropServices .Marshal.Copy(I ntPtr source, byte[]
destination, int start, int length)
"Pucca" <Pu***@discussi ons.microsoft.c omwrote in message
news:B1******** *************** ***********@mic rosoft.com...

Hi, I'm using VS2005, .net 2 and C# for windows application. I need to
convert a IntPtr to a byte[] to be able to add a meetingBlob data to the
meeting class object in Active Directory schema. I get a "unspecifie d
error"
if I tried to add the data before converting to a byte[] in
"deNewContextOb ject.Properties["meetingBlo b"].Add((object)bl ob.pData);".

public struct Blob
{
public IntPtr pData;
public int nLength;
public int nSize;
}

int nBytes = Marshal.SizeOf( typeof(CUnityDS .Blob));
IntPtr ptr = Marshal.AllocHG lobal(nBytes);

// create an instance of the Blob structure
CUnityDS.Blob blob = new CUnityDS.Blob() ;

// copy and pin the structure to that location
Marshal.Structu reToPtr(blob, ptr, true);

// Pass it by reference
// OK, now it's time to "reconsitut e" the structure
blob = (CUnityDS.Blob) Marshal.PtrToSt ructure(ptr,
typeof(CUnityDS .Blob));
CUnityDS.DE_ERR ORS errcode =
CUnityDS.DE_ERR ORS.DE_MEMORY_A LLOCATION_FAILU RE;
//EncodeAsnUser is a C unmanaged code that puts data from userContextData
struct to IntPtr
errcode = CUnityDS.LibWra p.EncodeAsnUser (ref blob, userContextData );
//Getting unspeficied error with the following line becuase it needs a
byte[] and not IntPtr
deNewContextObj ect.Properties["meetingBlo b"].Add((object)bl ob.pData);
--
Thanks.

[=?UTF-8?B?QXJuZSBWYWpow7hq?=]

Pucca wrote:

Thank yuou Lit. The blob is returned to me but the length is not set. How
can I get the length of the IntPrt for the parameter? Thank you.

Marshal.SizeOf maybe.

Arne

[Willy Denoyette [MVP]]

"Pucca" <Pu***@discussi ons.microsoft.c omwrote in message
news:50******** *************** ***********@mic rosoft.com...

Thank yuou Lit. The blob is returned to me but the length is not set.
How
can I get the length of the IntPrt for the parameter? Thank you.
--
Thanks.

Isn't nLength or nSize not the size of pData?

Willy.

[=?Utf-8?B?UHVjY2E=?=]

Yes, that gives me the size of pData. Thanks.
--
Thanks.
"Arne Vajhøj" wrote:

Pucca wrote:

Thank yuou Lit. The blob is returned to me but the length is not set. How
can I get the length of the IntPrt for the parameter? Thank you.

Marshal.SizeOf maybe.

Arne

[=?Utf-8?B?UHVjY2E=?=]

Hi Willy,
I thought it is. My code is calling a fucntion to encode the user structure
data into a blob. Well, as it turns out. I'm able to call it successfully
but the data is not encoded correctly into a blob. I just posted that
problem. It will be great if you can take a look at that. Thank you. (my
title of the problem is "Need Help declaring parameter variables for
DllImport c-code dll"). Thank you.
--
Thanks.
"Willy Denoyette [MVP]" wrote:

"Pucca" <Pu***@discussi ons.microsoft.c omwrote in message
news:50******** *************** ***********@mic rosoft.com...

Thank yuou Lit. The blob is returned to me but the length is not set.
How
can I get the length of the IntPrt for the parameter? Thank you.
--
Thanks.

Isn't nLength or nSize not the size of pData?

Willy.