/// <summary>
/// Demonstrates how to read and write to/from a
/// file at a certain file position
/// </summary>
protected void ReadWritePosDemo(Dog dog, Int32 fileId)
{
if ((null == dog) || !dog.IsLoggedIn())
{
return;
}
// firstly get a file object to a file.
DogFile file = dog.GetFile(fileId);
if (!file.IsLoggedIn())
{
// Not logged into dog - nothing left to do.
return;
}
// we want to write an int at the end of the file.
// therefore we are going to
// - get the file's size
// - set the object's read and write position to
// the appropriate offset.
int size = 0;
DogStatus status = file.FileSize(ref size);
if (DogStatus.StatusOk != status)
{
return;
}
// set the file pos to the end minus the size of int
file.FilePos = size - DogFile.TypeSize(typeof(int));
// now read what's there
int aValue = 0;
status = file.Read(ref aValue);
if (DogStatus.StatusOk != status)
{
return;
}
// write some data.
status = file.Write(int.MaxValue);
if (DogStatus.StatusOk != status)
{
return;
}
// read back the written value.
int newValue = 0;
status = file.Read(ref newValue);
if (DogStatus.StatusOk == status)
{
// restore the original data.
file.Write(aValue);
}
}
/// <summary>
/// Demonstrates how to read and write to/from a
/// file at a certain file position
/// </summary>
protected void ReadWritePosDemo(Dog dog, Int32 fileId)
{
if ((null == dog) || !dog.IsLoggedIn())
{
return;
}
Verbose("GetFileSize/FilePos Demo");
// firstly get a file object to a file.
DogFile file = dog.GetFile(fileId);
if (!file.IsLoggedIn())
{
// Not logged into dog - nothing left to do.
Verbose("Failed to get file object\r\n");
return;
}
Verbose("Reading contents of file: " + file.FileId.ToString());
Verbose("Retrieving the size of the file");
// we want to write an int at the end of the file.
// therefore we are going to
// - get the file's size
// - set the object's read and write position to
// the appropriate offset.
int size = 0;
DogStatus status = file.FileSize(ref size);
ReportStatus(status);
if (DogStatus.StatusOk != status)
{
Verbose("");
return;
}
Verbose("Size of the file is: " + size.ToString() + " Bytes");
Verbose("Setting file position to last int and reading value");
// set the file pos to the end minus the size of int
file.FilePos = size - DogFile.TypeSize(typeof(int));
// now read what's there
int aValue = 0;
status = file.Read(ref aValue);
ReportStatus(status);
if (DogStatus.StatusOk != status)
{
Verbose("");
return;
}
Verbose("Writing to file: 0x" + int.MaxValue.ToString("X2"));
// write some data.
status = file.Write(int.MaxValue);
ReportStatus(status);
if (DogStatus.StatusOk != status)
{
Verbose("");
return;
}
// read back the written value.
int newValue = 0;
Verbose("Reading written data");
status = file.Read(ref newValue);
ReportStatus(status);
if (DogStatus.StatusOk == status)
{
Verbose("Data read: 0x" + newValue.ToString("X2"));
}
// restore the original data.
file.Write(aValue);
Verbose("");
}