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Marshal::SecureStringToCoTaskMemUnicode Method

Copies the contents of a managed SecureString object to a block of memory allocated from the unmanaged COM task allocator.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public:
static IntPtr SecureStringToCoTaskMemUnicode(
	SecureString^ s
)

Parameters

s
Type: System.Security::SecureString
The managed object to copy.

Return Value

Type: System::IntPtr
The address, in unmanaged memory, where the s parameter was copied to, or 0 if a null object was supplied.

ExceptionCondition
ArgumentNullException

The s parameter is nullptr.

NotSupportedException

The current computer is not running Windows 2000 Service Pack 3 or later.

OutOfMemoryException

There is insufficient memory available.

The SecureStringToCoTaskMemUnicode method is useful for custom marshaling or when mixing managed and unmanaged code. Because this method allocates the unmanaged memory required for a string, always free the memory by calling the ZeroFreeCoTaskMemUnicode method. The characters of the string are copied as Unicode characters.

Notes to Callers

This method is supported only on computers running Windows 2000 Service Pack 3 or later.

The following example uses the SecureStringToCoTaskMemUnicode method to marshal and decrypt the contents of a SecureString object to a block of unmanaged memory. It then uses the ZeroFreeCoTaskMemUnicode method to zero out and dispose the unmanaged block.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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