Marshal.AllocCoTaskMem(Int32) Method

Definition

Allocates a block of memory of specified size from the COM task memory allocator.

[System.Security.SecurityCritical]
public static IntPtr AllocCoTaskMem (int cb);
public static IntPtr AllocCoTaskMem (int cb);

Parameters

cb
Int32

The size of the block of memory to be allocated.

Returns

IntPtr

An integer representing the address of the block of memory allocated. This memory must be released with FreeCoTaskMem(IntPtr).

Attributes

Exceptions

There is insufficient memory to satisfy the request.

Remarks

AllocCoTaskMem is one of two memory allocation API methods in the Marshal class. (Marshal.AllocHGlobal is the other.) The initial memory content returned is undefined, and the allocated memory can be larger than the requested number of bytes. This method exposes the COM CoTaskMemAlloc function, which is referred to as the COM task memory allocator.

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

See also