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Marshal.PtrToStringAnsi Method (IntPtr, Int32)

Allocates a managed String, copies a specified number of characters from an unmanaged ANSI string into it, and widens each ANSI character to Unicode.

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

public static string PtrToStringAnsi(
	IntPtr ptr,
	int len
)

Parameters

ptr
Type: System.IntPtr

The address of the first character of the unmanaged string.

len
Type: System.Int32

The byte count of the input string to copy.

Return Value

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

ExceptionCondition
ArgumentException

len is less than zero.

PtrToStringAnsi 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.StringToCoTaskMemAnsi and Marshal.StringToHGlobalAnsi methods.

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

using namespace System;
using namespace System::Runtime::InteropServices;



void main()
{
	// Create an unmanaged c string. 
	const char * myString = "Hello managed world (from the unmanaged world)!";

	// Convert the c string to a managed String.
	String ^ myManagedString = Marshal::PtrToStringAnsi((IntPtr) (char *) myString);

	// Display the string to the console.
	Console::WriteLine(myManagedString);
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

  • SecurityCriticalAttribute 

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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