Error Access Denied Createfilemapping
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Createfilemapping Error 5
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Cannot Create File Access Is Denied
or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a cannot create file access is denied windows 8 community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C CreateFileMapping error 5 Access Denied ALWAYS up vote 1 down vote favorite I would like to ask for help with WINAPI function CreateFileMapping (), which returns constantly NULL. After GetLastError() I get could not create file access denied 5 - "ERROR_ACCESS_DENIED 5 (0x5) Access is denied". The file has been created after CreateFile with no problem, but following CreateFileMapping never has bee succesful. int MapDestFile(LPCWSTR fPath) { hDestFile = CreateFile( fPath, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if (hSourceFile == NULL) { printf("%d\n", GetLastError()); } hDestMapFile = CreateFileMapping( hDestFile, NULL, PAGE_READWRITE, 0, 10, NULL ); if (hDestMapFile == NULL) { // here always tell error number 5 printf("%d\n", GetLastError()); } lpMapAddressDestFile = MapViewOfFile( hDestMapFile, FILE_MAP_WRITE, 0, 0, 0); if (lpMapAddressDestFile == NULL) { printf("%d\n", GetLastError()); } return 1; } I would appreciate any suggestions. Thanks winapi share|improve this question edited Dec 7 '13 at 22:42 David Heffernan 429k27583950 asked Dec 7 '13 at 22:27 Jan Bezdek 1314 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted You need to create the file with GENERIC_WRITE | GENERIC_READ to match PAGE_READWRITE. That seems self-evident when you think about it.
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Createfilemapping Global Access Denied
just like you, helping each other. Join them; it only takes a minute: Sign up Why does MapViewOfFile fail with ERROR_ACCESS_DENIED? up vote 3 down vote favorite I came across this situation with WinAPI's MapViewOfFile function. An http://stackoverflow.com/questions/20447498/c-createfilemapping-error-5-access-denied-always Internet search didn't turn up any apparent fixes, so I will share my problem and solution here. Consider the following snippet: const char *name = "Global\\Object_Name"; unsigned long size = get_object_size(); HANDLE handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, size, name); if (!handle || handle == INVALID_HANDLE_VALUE) exit(GetLastError()); bool created = GetLastError() == 0; void *block = MapViewOfFile( handle, FILE_MAP_ALL_ACCESS, 0, 0, size); if (block == NULL) exit(GetLastError()); In one particular case, CreateFileMapping was successfully http://stackoverflow.com/questions/16027268/why-does-mapviewoffile-fail-with-error-access-denied returning a handle. GetLastError was returning ERROR_ALREADY_EXISTS, so created == false. Now, the call to MapViewOfFile, using the same size that I passed to CreateFileMapping, returns NULL and GetLastError returns 0x05: ERROR_ACCESS_DENIED. The process was running with administrator privileges. The MSDN documentation doesn't really mention any reason why this situation would occur. So why does CreateFileMapping succeed, but MapViewOfFile fail? c winapi shared-memory share|improve this question edited Apr 16 '13 at 1:38 asked Apr 16 '13 at 1:24 Anthony Arnold 7,69974483 add a comment| 2 Answers 2 active oldest votes up vote 5 down vote accepted I'm sure there are many reasons why ERROR_ACCESS_DENIED could occur from a call to MapViewOfFile. In my particular situation, it was due to the size argument. The hint is in the fact that created == false. It shows that the object "Global\\Object_Name" has already been created. For whatever reason, the creating call initialised the section with a smaller size. For what seems like an oversight, the second call to CreateFileMapping will happily give you a handle to the already-existing object, even if you asked for a bigger mapping. The call to MapViewOfFile now fails, because it's requesting a view that is bigger than the actual section. So, if you're in a similar situation where the second call to MapViewOfFile fails, check the size that you'r
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