StringToCoTaskMemAnsi Method
Collapse the table of content
Expand the table of content

Marshal.StringToCoTaskMemAnsi Method (String)


Copies the contents of a managed String to a block of memory allocated from the unmanaged COM task allocator.

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

public static IntPtr StringToCoTaskMemAnsi(
	string s


Type: System.String

A managed string to be copied.

Return Value

Type: System.IntPtr

An integer representing a pointer to the block of memory allocated for the string, or 0 if s is null.

Exception Condition

There is insufficient memory available.


The s parameter exceeds the maximum length allowed by the operating system.

StringToCoTaskMemAnsi is useful for custom marshaling or when mixing managed and unmanaged code. Because this method allocates the unmanaged memory required for a string, always free the memory by calling FreeCoTaskMem. This method provides the opposite functionality of Marshal.PtrToStringAnsi. The characters of the string are copied as ANSI characters.


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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Return to top
© 2015 Microsoft