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Marshal.PtrToStringAnsi Method (IntPtr)

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

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

public static string PtrToStringAnsi(
	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 ANSI string. If ptr is null, the method returns a null string.

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

  • SecurityCriticalAttribute 

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

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