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Marshal::SecureStringToGlobalAllocUnicode Method

Copies the contents of a managed SecureString object into unmanaged memory.

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

public:
static IntPtr SecureStringToGlobalAllocUnicode(
	SecureString^ s
)

Parameters

s
Type: System.Security::SecureString

The managed object to copy.

Return Value

Type: System::IntPtr
The address, in unmanaged memory, where s was copied, or 0 if s is a SecureString object whose length is 0.

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 SecureStringToGlobalAllocUnicode method is useful for custom marshaling or for use when mixing managed and unmanaged code. Because this method allocates the unmanaged memory required for a string, always free the memory by calling the ZeroFreeGlobalAllocUnicode method.

Notes to Callers

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

The following example demonstrates how to use the SecureStringToGlobalAllocUnicode method with the unmanaged LogonUser function to perform impersonation with the SecureString class. The example then uses the ZeroFreeGlobalAllocUnicode method to zero out and free the unmanaged string reference.

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

.NET Framework

Supported in: 4.6, 4.5, 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.

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