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MSDN Library

Marshal.PtrToStringBSTR Method

Allocates a managed String and copies a BSTR Data Type string stored in unmanaged memory into it.

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

public static string PtrToStringBSTR(
	IntPtr ptr
)

Parameters

ptr
Type: System.IntPtr

The address of the first character of the unmanaged string.

Return Value

Type: System.String
A managed string that holds a copy of the unmanaged string if the value of the ptr parameter is not null; otherwise, this method returns null.

Call this method only on strings that were allocated with the unmanaged SysAllocString Function and SysAllocStringLen Function functions.

PtrToStringBSTR is useful for custom marshaling or when mixing managed and unmanaged code. Because this method creates a copy of the unmanaged string's contents, you must free the original string as appropriate. This method provides the opposite functionality of the Marshal.StringToBSTR method.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Portable Class Library

Supported in: Portable Class Library

  • SecurityCriticalAttribute 

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

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