XN_C_API XnStatus xnOSCreateSharedMemory(const XnChar* strName, XnUInt32 nSize, XnUInt32 nAccessFlags, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
XnStatus nRetVal = XN_STATUS_OK;
XN_VALIDATE_INPUT_PTR(strName);
XN_VALIDATE_OUTPUT_PTR(phSharedMem);
DWORD mapflags;
nRetVal = AccessFlagsToWin32MapFlags(nAccessFlags, &mapflags);
XN_IS_STATUS_OK(nRetVal);
DWORD viewflags;
nRetVal = AccessFlagsToWin32ViewFlags(nAccessFlags, &viewflags);
XN_IS_STATUS_OK(nRetVal);
XnChar strWinName[XN_FILE_MAX_PATH];
nRetVal = NameToWin32Name(strName, strWinName);
XN_IS_STATUS_OK(nRetVal);
// allocate handle
XnOSSharedMemory* pHandle;
XN_VALIDATE_CALLOC(pHandle, XnOSSharedMemory, 1);
// create file mapping
pHandle->hMapFile = CreateFileMapping(
INVALID_HANDLE_VALUE, // use paging file
NULL, // default security
mapflags, // read/write access
0, // max. object size
nSize, // buffer size
strWinName); // name of mapping object
if (pHandle->hMapFile == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not create file mapping object (%d).", GetLastError());
}
// map it to the process
pHandle->pAddress = MapViewOfFile(
pHandle->hMapFile, // handle to map object
viewflags, // read/write permission
0,
0,
nSize);
if (pHandle->pAddress == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not map view of file (%d).", GetLastError());
}
*phSharedMem = pHandle;
return (XN_STATUS_OK);
}
XN_C_API XnStatus XN_C_DECL xnOSCreateSharedMemoryEx(const XnChar* strName, XnUInt32 nSize, XnUInt32 nAccessFlags, XnBool bAllowOtherUsers, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
XnStatus nRetVal = XN_STATUS_OK;
XN_VALIDATE_INPUT_PTR(strName);
XN_VALIDATE_OUTPUT_PTR(phSharedMem);
DWORD mapflags;
nRetVal = AccessFlagsToWin32MapFlags(nAccessFlags, &mapflags);
XN_IS_STATUS_OK(nRetVal);
DWORD viewflags;
nRetVal = AccessFlagsToWin32ViewFlags(nAccessFlags, &viewflags);
XN_IS_STATUS_OK(nRetVal);
XnChar strWinName[XN_FILE_MAX_PATH];
nRetVal = XnWin32CreateKernelObjectName(strWinName, MAX_PATH, strName, bAllowOtherUsers);
if (nRetVal != XN_STATUS_OK)
{
return XN_STATUS_OS_EVENT_CREATION_FAILED;
}
SECURITY_ATTRIBUTES* pSecurityAttributes = NULL;
nRetVal = XnWin32GetSecurityAttributes(bAllowOtherUsers, &pSecurityAttributes);
if (nRetVal != XN_STATUS_OK)
{
return XN_STATUS_OS_EVENT_CREATION_FAILED;
}
// allocate handle
XnOSSharedMemory* pHandle;
XN_VALIDATE_CALLOC(pHandle, XnOSSharedMemory, 1);
// create file mapping
pHandle->hMapFile = CreateFileMapping(
INVALID_HANDLE_VALUE, // use paging file
pSecurityAttributes, // security
mapflags, // read/write access
0, // max. object size
nSize, // buffer size
strWinName); // name of mapping object
if (pHandle->hMapFile == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not create file mapping object (%d).", GetLastError());
}
// map it to the process
pHandle->pAddress = MapViewOfFile(
pHandle->hMapFile, // handle to map object
viewflags, // read/write permission
0,
0,
nSize);
if (pHandle->pAddress == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not map view of file (%d).", GetLastError());
}
*phSharedMem = pHandle;
return (XN_STATUS_OK);
}
