Marshal.PtrToStringAnsi Method (IntPtr)

Copies all characters up to the first null from an unmanaged ANSI string to a managed String. Widens each ANSI character to Unicode.

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

public static string PtrToStringAnsi (
	IntPtr ptr
public static String PtrToStringAnsi (
	IntPtr ptr
public static function PtrToStringAnsi (
	ptr : IntPtr
) : String



The address of the first character of the unmanaged string.

Return Value

A managed String object that holds a copy of the unmanaged ANSI string. If ptr is a null reference (Nothing in Visual Basic), the method returns a null string.

PtrToStringAnsi is useful for custom marshaling or when mixing managed and unmanaged code. Since 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 Marshal.StringToCoTaskMemAnsi and Marshal.StringToHGlobalAnsi.


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.

The following code example uses the PtrToStringAnsi method to create a managed string from an unmanaged char array.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0