{"id":13095,"date":"2024-03-15T01:54:31","date_gmt":"2024-03-15T01:54:31","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-createfilemapping-function-used\/"},"modified":"2025-08-05T11:15:58","modified_gmt":"2025-08-05T11:15:58","slug":"how-is-the-createfilemapping-function-used","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-createfilemapping-function-used\/","title":{"rendered":"CreateFileMapping Function Explained"},"content":{"rendered":"

The CreateFileMapping function is used to create a file mapping object, which maps a file to one or more regions in the virtual address space of a process.<\/p>\n

Function prototype:
\nHANDLE CreateFileMapping(
\nHANDLE hFile,
\nLPSECURITY_ATTRIBUTES lpAttributes,
\nDWORD flProtect,
\nDWORD dwMaximumSizeHigh,
\nDWORD dwMaximumSizeLow,
\nLPCTSTR lpName
\n);<\/p>\n

Explanation of parameters:<\/p>\n

    \n
  1. hFile: The file handle associated with the file mapping. Obtain this handle by opening a file using the CreateFile function.<\/li>\n
  2. lpAttributes: a pointer to a SECURITY_ATTRIBUTES structure specifying the security attributes of the file mapping object. It can be NULL.<\/li>\n
  3. flProtect: Specifies the access protection attributes for a file mapping object. Common values include PAGE_READONLY, PAGE_READWRITE, and so on.<\/li>\n
  4. dwMaximumSizeHigh and dwMaximumSizeLow: specify the maximum size of the file mapping object. If it is 0, it means mapping the entire file.<\/li>\n
  5. The lpName parameter specifies the name of the file mapping object. It can be NULL.<\/li>\n<\/ol>\n

    Return value:<\/p>\n

      \n
    1. Success: Handle to the file mapping object.<\/li>\n
    2. Failure: NULL. You can use the GetLastError function to retrieve error information.<\/li>\n<\/ol>\n

      The file mapping object created using the CreateFileMapping function can be mapped to the virtual address space of a process using the MapViewOfFile function, allowing access to the file’s data using pointers.<\/p>\n","protected":false},"excerpt":{"rendered":"

      The CreateFileMapping function is used to create a file mapping object, which maps a file to one or more regions in the virtual address space of a process. Function prototype: HANDLE CreateFileMapping( HANDLE hFile, LPSECURITY_ATTRIBUTES lpAttributes, DWORD flProtect, DWORD dwMaximumSizeHigh, DWORD dwMaximumSizeLow, LPCTSTR lpName ); Explanation of parameters: hFile: The file handle associated with the […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[17351,17352,328,7040,9861],"class_list":["post-13095","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-createfilemapping","tag-file-mapping","tag-memory-management","tag-windows-api","tag-windows-programming"],"yoast_head":"\nCreateFileMapping Function Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Master Windows file mapping: Learn CreateFileMapping usage, parameters, and implementation for efficient memory management.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-is-the-createfilemapping-function-used\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CreateFileMapping Function Explained\" \/>\n<meta property=\"og:description\" content=\"Master Windows file mapping: Learn CreateFileMapping usage, parameters, and implementation for efficient memory management.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-is-the-createfilemapping-function-used\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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