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Marshal.StringToHGlobalUni Method

Copies the contents of a managed String into unmanaged memory.

[Visual Basic]
Public Shared Function StringToHGlobalUni( _
   ByVal s As String _
) As IntPtr
[C#]
public static IntPtr StringToHGlobalUni(
 string s
);
[C++]
public: static IntPtr StringToHGlobalUni(
 String* s
);
[JScript]
public static function StringToHGlobalUni(
   s : String
) : IntPtr;

Parameters

s
A managed string to be copied.

Return Value

The address, in unmanaged memory, to where the s was copied, or 0 if a null reference (Nothing in Visual Basic) string was supplied.

Exceptions

Exception Type Condition
OutOfMemoryException The method could not allocate enough native heap memory.

Remarks

StringToHGlobalUni is useful for custom marshaling or for use when mixing managed and unmanaged code. Since this method allocates the unmanaged memory required for a string, always free the memory by calling FreeHGlobal. This method provides the opposite functionality of Marshal.PtrToStringUni.

Note   This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

Note[note] This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see "Secure Coding Guidelines for the .NET Framework" in the MSDN Library.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

.NET Framework Security: 

See Also

Marshal Class | Marshal Members | System.Runtime.InteropServices Namespace | PtrToStringUni

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