Garuda Code

CreateFileMapping MapViewOfFile

CreateFileMapping MapViewOfFile

HANDLE CreateFileMapping( HANDLE hFile, LPSECURITY_ATTRIBUTES lpAttributes, ... 위는 매핑을 하기위한 핸들을 얻어냈을 뿐이고 실제로 매핑을 하는 함수는 MapViewOfFile 함수이다. LPVOID MapViewOfFile( HANDLE hFileMappingObject, C++ CreateFileMapping/MapViewOfFile Win32 APIs 1. An example of using **CreateFileMapping** and **MapViewOfFile** to **append** a **string of data** to the end of a file as **quickly** as possible. 2. The function for that will be: **AppendData(LPCSTR FileName, LPCSTR Data) ** 3. If the file does **not exist** then **create** it. … CreateFileMapping can create a file mapping object with a 64-bit size, but when you map a view of the file-mapping object, the mapped portion of the file-mapping object must fit into your virtual address space. A 32-bit operating system has 32 bit addresses … These functions fail if the access flags conflict with those specified when CreateFileMapping created the file mapping object. The MapViewOfFile function returns a pointer to the file view. By dereferencing a pointer in the range of addresses specified in MapViewOfFile, an application can read data from the file and write data to the file. Writing to the file view results in changes to the file mapping object. CreateFileMappingA function (winbase.h) C++ (Cpp) MapViewOfFile - 30 examples found. These are the top rated real world C++ (Cpp) examples of MapViewOfFile extracted from open source projects. You can rate examples to help us improve the quality of examples. Creating a File View C++ (Cpp) MapViewOfFile Examples

Creating a File Mapping Using Large Pages

I think mmap is relating more with MapViewOfFile than CreateFileMapping. MapViewOfFile takes the length of the view by SIZE_T (which is pointer sized in Windows like the off_t you mentioned). Even on a 32 bit machine a mapping object can be bigger than 2^32, it's the view that's limited by address space. EOUTOFMEMORY or Unable to Map File or Unable to MapViewOfFile This usually occurs when your game file runs out of ram, common on PCs with low ram or running 32bit versions of windows. Running the game with Texture Quality set to Medium usually fixes this, though having less than 4gb of ram will cause problems after changing areas a number of times. About CreateFileMapping... can maximum size of the mapping be ... unable to MapViewOfFile in MapChunk ...

MapViewOfFile function (memoryapi.h)

First Process. The first process creates the file mapping object by calling the CreateFileMapping function with INVALID_HANDLE_VALUE and a name for the object. By using the PAGE_READWRITE flag, the process has read/write permission to the memory through any file views that are created. Also, the number of bytes to map in MapViewOfFile should be small enough that the view isn't longer than the file itself. HANDLE hMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, 5, L"myfile"); LPVOID mappointer = MapViewOfFile(hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 5); Creating Named Shared Memory Note. Starting in Windows 10, version 1703, the MapViewOfFile function maps a view using small pages by default, even for file mapping objects created with the SEC_LARGE_PAGES flag. In this and later OS versions, you must specify the FILE_MAP_LARGE_PAGES flag with the MapViewOfFile function to map large pages. This flag is ignored on OS versions before Windows 10, version 1703. // // Open up a file, memory map it, and call the appropriate dumping routine // void DumpFile(LPSTR filename) { HANDLE hFile; HANDLE hFileMapping; LPVOID lpFileBase; PIMAGE_DOS_HEADER dosHeader; hFile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); if ( hFile == INVALID_HANDLE_VALUE ) { printf("Couldn't open file with … C++ (Cpp) CreateFileMapping Examples CreateFileForMapping-CreateFileMapping-MapViewOfFile. The call CreateFileMapping() fails and GetLastError() returns the error code ERROR_NOT_ENOUGH_MEMORY I'm using a Mio A201. I have no problem with file sizes below 200 Mb. I tried with several PDAs, it seems that this limit depends on the model. For example an old iPaq seems to have an higher limit. CreateFileMapping MapViewOfFile Creating a File Mapping Using Large Pages