If you want to view a portion of the file that does not start at the beginning of the file, you must create a file mapping object. File Mapping Size The size of the file mapping object is independent of the size of the file being mapped. If this parameter and dwMaximumSizeHigh are 0 zero , the maximum size of the file mapping object is equal to the current size of the file that hFile identifies. This map needs to be visible between sessions, so I am attempting to create it in the global namespace. Use structured exception handling to protect any code that writes to or reads from a file view. Applications should test for files with a length of 0 zero and reject those files.
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After the pages are committed, they cannot be freed or decommitted with the VirtualFree function.
The handle returned by CreateFile is used by the CreateFileMapping function to create a file mapping object. Kernel object names must follow the guidelines that are outlined for Terminal Services so that applications can support multiple users.
Choose a web site to get translated content where available and see creategilemapping events and offers. If this parameter is NULLthe file mapping object is created without a name.
Filteg structured exception handling to protect any code that writes to or reads from a file view. The remainder of the name can contain any character except the backslash character. There is a mapping object that has a name and lives in memory, but no actual disk file. You filtef tell whether or not a successful call to CreateFileMapping created or opened the file mapping object by calling the GetLastError function. The size of a file view is limited to the largest available contiguous block of unreserved virtual memory.
What am I missing? Select the China site in Chinese or English for best site performance. Doing this creates a file mapping object that is exactly the same size as the file. I know that the running users needs SeCreateGlobalPrivilege in order for this to work. Fast user switching is implemented by using Terminal Services sessions. It is not required, but it is recommended that files you intend to map be opened for exclusive access.
In this scenario, CreateFileMapping creates a file mapping object of a specified size that is backed by the system paging file instead of by a file in the file system. Coherency is guaranteed for views within a process and for views that are mapped by different processes. Cerca Answers Clear Filters.
The file must be opened with access rights that are compatible with the protection flags that the flProtect parameter specifies. This object is the size of the portion of the file that you want to view plus the offset into the file.
Reserved pages can be committed in subsequent calls to the VirtualAlloc function. After a file mapping object is created, the size of the file must not exceed the size of the file mapping object; if it does, not all of the file contents are available for sharing. The handle that CreateFileMapping returns has full access to a new file mapping object, and can be used with any function that requires a handle to a file mapping object.
windows – Global namespace CreateFileMapping and SeCreateGlobalPrivilege – Stack Overflow
This is how UAC works. Return Value If the function succeeds, the return value is a handle to the newly created file mapping object. Sign up using Facebook. Sign in to answer this question. File Mapping Size The size of the file mapping object is independent of the size of the file being mapped. Unable to complete the action because of changes made to the page.
An Error Occurred Unable to complete the action because of changes made to the page. This is at most 2 GB minus the virtual memory already reserved by the process. Contatti Come Acquistare Accedi. Sign up using Email and Password. Page protection for views of an executable image file is determined by the executable file itself.