src/contrib/libqxt-2007-10-24/src/core/qxtfilelock_win.cpp

   1 #include "qxtfilelock.h"
   2 #include "qxtfilelock_p.h"
   3 #include <windows.h>
   4 #include <io.h>
   5
   6 #if 1
   7
   8 bool QxtFileLock::unlock()
   9 {
  10     if (file() && file()->isOpen() && isActive())
  11     {
  12         HANDLE w32FileHandle;
  13         OVERLAPPED ov1;
  14         DWORD dwflags;
  15
  16         w32FileHandle = (HANDLE)_get_osfhandle(file()->handle());
  17         if (w32FileHandle == INVALID_HANDLE_VALUE)
  18             return false;
  19
  20         memset(&ov1,0, sizeof(ov1));
  21         ov1.Offset =  qxt_d().offset;
  22
  23         if (UnlockFileEx(w32FileHandle, 0, qxt_d().length, 0, &ov1))
  24         {
  25             qxt_d().isLocked = false;
  26             return true;
  27         }
  28     }
  29     return false;
  30 }
  31
  32 bool QxtFileLock::lock ()
  33 {
  34     if (file() && file()->isOpen() && !isActive())
  35     {
  36         HANDLE w32FileHandle;
  37         OVERLAPPED ov1;
  38         DWORD dwflags;
  39
  40         w32FileHandle = (HANDLE)_get_osfhandle(file()->handle());
  41         if (w32FileHandle == INVALID_HANDLE_VALUE)
  42             return false;
  43
  44         switch (qxt_d().mode)
  45         {
  46         case    ReadLock:
  47             dwflags = LOCKFILE_FAIL_IMMEDIATELY;
  48             break;
  49
  50         case    ReadLockWait:
  51             dwflags = 0;
  52             break;
  53
  54         case    WriteLock:
  55             dwflags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
  56             break;
  57
  58         case    WriteLockWait:
  59             dwflags = LOCKFILE_EXCLUSIVE_LOCK;
  60             break;
  61
  62         default:
  63             return (false);
  64         }
  65
  66         memset(&ov1, 0, sizeof(ov1));
  67         ov1.Offset =  qxt_d().offset;
  68
  69         if (LockFileEx(w32FileHandle,dwflags, 0,  qxt_d().length, 0, &ov1))
  70         {
  71             qxt_d().isLocked = true;
  72             return true;
  73         }
  74     }
  75     return false;
  76 }
  77
  78 #else
  79 bool QxtFileLock::unlock()
  80 {
  81     return false;
  82 }
  83
  84 bool QxtFileLock::lock ()
  85 {
  86     return false;
  87 }
  88 #endif