Marshal.AllocHGlobal Method (IntPtr)
Allocates memory from the process's unmanaged memory.
[Visual Basic] Overloads Public Shared Function AllocHGlobal( _ ByVal cb As IntPtr _ ) As IntPtr [C#] public static IntPtr AllocHGlobal( IntPtr cb ); [C++] public: static IntPtr AllocHGlobal( IntPtr cb ); [JScript] public static function AllocHGlobal( cb : IntPtr ) : IntPtr;
- The number of bytes in memory required.
|OutOfMemoryException||There is insufficient memory to satisfy the request.|
AllocHGlobal is one of two memory allocation API methods in the Marshal class. (Marshal.AllocCoTaskMem is the other.) This method exposes the GlobalAlloc Win32 API from Kernel32.dll. For additional information about GlobalAlloc, see the MSDN Library.
Note 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.
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
.NET Framework Security:
- SecurityPermission for operating with unmanaged code. Associated enumeration: SecurityPermissionFlag.UnmanagedCode.