Createfilemapping Returns Error Access Denied
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Createfilemapping Example
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Createfilemapping Error 6
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 5 - "ERROR_ACCESS_DENIED 5 (0x5) Access is denied". The file has been created after CreateFile with no problem, but following CreateFileMapping never has
Createfilemapping Example C++
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 429k27582948 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. How can you have memory that you can read from backed by a file that you cannot read from? The documentation does call this out explicitly in any case: PAGE_READWRITE The file handle that the hFile parameter specifies must be created with the GENERIC_READ and GENERIC_WRITE ac
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Openfilemapping Access Denied
might have Meta Discuss the workings and policies of this site About Us secreateglobalprivilege windows 7 Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation http://stackoverflow.com/questions/20447498/c-createfilemapping-error-5-access-denied-always Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Access denied on CreateFileMapping when run under different user http://stackoverflow.com/questions/10849498/access-denied-on-createfilemapping-when-run-under-different-user-accounts-with-r accounts with runas up vote 1 down vote favorite This code gives me access denied errors when trying to open previously created file mapping. Help, help, help. OS: WinXP SP3, no fast user switching. Following code is run on 2 different user accounts using runas. Both users have Administrator privileges. test code: SECURITY_DESCRIPTOR sd; if(!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) printf("InitializeSecurityDescriptor failed %d\n", GetLastError()); if(!SetSecurityDescriptorDacl(&sd, true, 0, false)) printf("SetSecurityDescriptorDacl failed %d\n", GetLastError()); SECURITY_ATTRIBUTES sa; sa.nLength = sizeof(sa); sa.lpSecurityDescriptor = &sd; sa.bInheritHandle = false; HANDLE hMap = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, 0x1000, "Global\\MyMap"); void* pMap = 0; if(hMap) { pMap = MapViewOfFile(hMap, FILE_MAP_ALL_ACCESS, 0, 0, 0x1000); } else { printf("CreateFileMapping failed: %d\n", GetLastError()); hMap = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, "Global\\MyMap"); if(hMap) { printf("OpenFileMapping sucess!\n"); } else { printf("OpenFileMapping failed: %d\n", GetLastError()); } } if(pMap) { printf("Sucess!\n"); printf("DW: %X", *(DWORD*)pMap); *
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