c# - How to get an IntPtr to access the view of a MemoryMappedFile? -

is there way direct intptr data in memorymappedfile? have large data block high frequency change , don't want copy it

no, not intptr, doesn't anyway. can byte*, can cast @ access actual data type. , can cast intptr if have to. having use unsafe keyword quite intentional.

create memorymappedviewaccessor create view on mmf. use acquirepointer() method of safememorymappedviewhandle property obtain byte*.

a sample program demonstrates usage , shows various pointer shenanigans:

using system; using system.diagnostics; using system.runtime.interopservices;  class program {     static unsafe void main(string[] args) {         using (var mmf = system.io.memorymappedfiles.memorymappedfile.createnew("test", 42))         using (var view = mmf.createviewaccessor()) {             byte* poke = null;             view.safememorymappedviewhandle.acquirepointer(ref poke);             *(int*)poke = 0x12345678;             debug.assert(*poke == 0x78);             debug.assert(*(poke + 1) == 0x56);             debug.assert(*(short*)poke == 0x5678);             debug.assert(*((short*)poke + 1) == 0x1234);             debug.assert(*(short*)(poke + 2) == 0x1234);             intptr ipoke = (intptr)poke;             debug.assert(marshal.readint32(ipoke) == 0x12345678);             *(poke + 1) = 0xab;             debug.assert(marshal.readint32(ipoke) == 0x1234ab78);             view.safememorymappedviewhandle.releasepointer();         }     } }