问题
I am using a class which has StringHandle field which is an IntPtr value that represents a
LPCWSTR in C++.
internal IntPtr StringHandle; // LPCWSTR
say now that I have a String: string x = "abcdefg"
How can I use the String handle to point to the beginning of the String so that it is like C++ LPCWSTR ?
回答1:
You need to copy the string to the unmanaged memory first and then get the IntPtr from that location. You can do so like:
IntPtr strPtr = Marshal.StringToHGlobalUni(x);
also, you need to make sure to free the unmanaged memory:
Marshal.FreeHGlobal(strPtr);
it's best to do all this in a try/finally.
回答2:
Managed strings move in memory when the garbage collector compacts the heap. So they don't have a stable address and can't directly be cast to a LPCWSTR. You'll need to either pin the string with GCHandle.Alloc() to use GCHandle.AddrOfPinnedObject or copy it into unmanaged memory with Marshal.StringToHGlobalUni().
Strongly prefer copying if the address needs to be stable for a while.
回答3:
You want to use one of the StringTo* methods on the Marshal class
来源：https://stackoverflow.com/questions/11090427/make-intptr-in-c-net-point-to-string-value