6/13/2023 0 Comments Memory mapped io vs io mapped io![]() ![]() Public static System.IO.MemoryMappedFiles.MemoryMappedFile OpenExisting (string mapName, System.IO.MemoryMappedFiles.MemoryMappedFileRights desiredAccessRights) public static System.IO.MemoryMappedFiles.MemoryMappedFile OpenExisting (string mapName, System.IO.MemoryMappedFiles.MemoryMappedFileRights desiredAccessRights) ![]() Static System::IO::MemoryMappedFiles::MemoryMappedFile ^ OpenExisting(System::String ^ mapName, System::IO::MemoryMappedFiles::MemoryMappedFileRights desiredAccessRights) Opens an existing memory-mapped file that has the specified name and access rights in system memory. The memory-mapped file can be either a persisted memory-mapped file (associated with a file on disk) or non-persisted. This code example is part of a larger example provided for the CreateNew(String, Int64) method. The following example opens a memory-mapped file used for inter-process communication. Opening a Non-Persisted Memory-Mapped File Green = CShort(Math.Min(Short.MaxValue, CInt(Green) + value))īlue = CShort(Math.Min(Short.MaxValue, CInt(Blue) + value))Īlpha = CShort(Math.Min(Short.MaxValue, CInt(Alpha) + value)) Red = CShort(Math.Min(Short.MaxValue, CInt(Red) + value)) Public Sub Brighten(ByVal value As Short) Using accessor = mmf.CreateViewAccessor(4000000, 2000000)ĭim colorSize As Integer = Marshal.SizeOf(GetType(M圜olor)) Using mmf = MemoryMappedFile.OpenExisting("ImgA") ' Assumes another process has created the memory-mapped file. Public Shared Sub Main(ByVal args As String()) Green = (short)Math.Min(short.MaxValue, (int)Green + value) īlue = (short)Math.Min(short.MaxValue, (int)Blue + value) Īlpha = (short)Math.Min(short.MaxValue, (int)Alpha + value) Red = (short)Math.Min(short.MaxValue, (int)Red + value) Int colorSize = Marshal.SizeOf(typeof(M圜olor)) įor (long i = 0 i < 1500000 i += colorSize) Using (var mmf = MemoryMappedFile.OpenExisting("ImgA")) Assumes another process has created the memory-mapped file. ![]() The following example opens a memory-mapped file named ImgA that has already been created from a file on disk (as shown in the example for the CreateFromFile(String) method). The file specified for mapName does not exist. ![]()
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