private IntPtr ReadHandleFromFromMappedFile()
{
int error = NativeConstants.ERROR_SUCCESS;
IntPtr lpData = SafeNativeMethods.MapViewOfFile(
this.hFileMapping,
NativeConstants.FILE_MAP_READ,
0,
0,
new UIntPtr((uint)mappingSize));
error = Marshal.GetLastWin32Error();
if (lpData == IntPtr.Zero)
{
throw new Win32Exception(error, "MapViewOfFile() returned NULL (" + error + ")");
}
byte[] int64Bytes = new byte[(int)mappingSize];
Marshal.Copy(lpData, int64Bytes, 0, mappingSize);
long int64 = 0;
for (int i = 0; i < mappingSize; ++i)
{
int64 += (long)(int64Bytes[i] << (i * 8));
}
bool bResult = SafeNativeMethods.UnmapViewOfFile(lpData);
error = Marshal.GetLastWin32Error();
if (!bResult)
{
throw new Win32Exception(error, "UnmapViewOfFile() returned FALSE (" + error + ")");
}
IntPtr hValue = new IntPtr(int64);
return(hValue);
}
private void WriteHandleValueToMappedFile(IntPtr hValue)
{
int error = NativeConstants.ERROR_SUCCESS;
bool bResult = true;
IntPtr lpData = SafeNativeMethods.MapViewOfFile(
this.hFileMapping,
NativeConstants.FILE_MAP_WRITE,
0,
0,
new UIntPtr((uint)mappingSize));
error = Marshal.GetLastWin32Error();
if (lpData == IntPtr.Zero)
{
throw new Win32Exception(error, "MapViewOfFile() returned NULL (" + error + ")");
}
long int64 = hValue.ToInt64();
byte[] int64Bytes = new byte[(int)mappingSize];
for (int i = 0; i < mappingSize; ++i)
{
int64Bytes[i] = (byte)((int64 >> (i * 8)) & 0xff);
}
Marshal.Copy(int64Bytes, 0, lpData, mappingSize);
bResult = SafeNativeMethods.UnmapViewOfFile(lpData);
error = Marshal.GetLastWin32Error();
if (!bResult)
{
throw new Win32Exception(error, "UnmapViewOfFile() returned FALSE (" + error + ")");
}
}
