private void bStopStreaming_Click(object sender, EventArgs e)
{
bool qResult;
tbLog.AppendText(String.Format("********** Stopping stream **********\n", qusbError));
// Stop the timer
timer.Stop();
// Stop the data stream
qResult = qusb.StopStream(streamID, false);
if (!qResult)
{
qusbError = qusb.LastError();
tbLog.AppendText(String.Format("BulkDataStopStream failed with error {0}\n", qusbError));
}
// Close the module
qResult = qusb.Close();
if (!qResult)
{
Console.WriteLine("QuickUSB Error: {0}", qusb.LastError());
return;
}
// Reset variables
streaming = false;
// Reset buttons
bStartStreaming.Enabled = true;
bStopStreaming.Enabled = false;
}
// QuickUSB Asynchronous Imaging Example
void Acquire()
{
int k = 0;
if (!aquiring)
{
return;
}
// Wait for the transaction to complete (The completion routine will be called)
do
{
qResult = qusb.BulkWait(BulkStream[k], false);
if (!qResult)
{
qusbError = qusb.LastError();
if (qusbError == QuickUsb.Error.Timeout)
{
// While we wait for this request to complete, we could be performing some
// background tasks
timer1.Enabled = false;
Application.DoEvents();
timer1.Enabled = true;
}
}
} while (!qResult && qusb.LastError() == QuickUsb.Error.Timeout);
if (!qResult)
{
qusbError = qusb.LastError();
return;
}
// Calculate FPS
QueryPerformanceCounter(out tEnd);
tElapsed = (double)(tEnd - tStart) / (double)(freq);
tStart = tEnd;
toolStripStatusLabel1.Text = String.Format("FPS: {0:0.0}", 1.0 / tElapsed);
// Blit data to screen
BitmapData bData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
MoveMemory(bData.Scan0, BufferArray[0], FrameByteSize);
image.UnlockBits(bData);
pbFrame.Invalidate();
// Issue a new transaction
qResult = qusb.ReadBulkDataAsync(
BufferArray[0],
FrameByteSize,
BulkStream[0],
cbDelegate,
IntPtr.Zero);
if (!qResult)
{
toolStripStatusLabel1.Text = "Error: Unable to issue data read";
qusb.Close();
return;
}
}
public void LastErrorTest()
{
QuickUsb target = new QuickUsb("QUSB-0");
QuickUsb.Error expected = QuickUsb.Error.NoError;
QuickUsb.Error actual;
actual = target.LastError();
Assert.AreEqual(expected, actual);
}
private void bStartStreaming_Click(object sender, EventArgs e)
{
bool qResult;
qusb = qusbControl.SelectedModule;
tbLog.AppendText(String.Format("********** Starting stream **********\n", qusbError));
// Open the module
qResult = qusb.Open();
if (!qResult)
{
tbLog.AppendText(String.Format("Unable to open module\n", qusbError));
return;
}
// Start the data stream
if (UserAllocatedBuffers)
{
// Start streaming data to our user allocated data buffers
qResult = qusb.ReadBulkDataStartStream(BufferArray, NumBuffers, BufferByteSize, cbDelegate, IntPtr.Zero, out streamID, NumThreads, ThreadConcurrency);
}
else
{
// Start streaming data to data buffers that will be allocated interally by the Streaming API
qResult = qusb.ReadBulkDataStartStream(IntPtr.Zero, NumBuffers, BufferByteSize, cbDelegate, IntPtr.Zero, out streamID, NumThreads, ThreadConcurrency);
}
// Check for an error starting the stream
if (!qResult)
{
qusbError = qusb.LastError();
qusb.Close();
tbLog.AppendText(String.Format("ReadBulkDataStartStream failed with error {0}\n", qusbError));
return;
}
// Reset buttons
bStartStreaming.Enabled = false;
bStopStreaming.Enabled = true;
// Reset variables
TotalKiloBytes = 0;
ErrorCount = 0;
streaming = true;
// Start throughput timer
QueryPerformanceFrequency(out freq);
QueryPerformanceCounter(out tStart);
// Start timer
timer.Start();
}
private void timer_Tick(object sender, EventArgs e)
{
if (numPendingRequests != 0)
{
// If we are not multithreading the stream in this example, we must
// allow time for processing requests. Processing requests simply
// means checking if a request has completed, execute its completion
// routine, and re-issue the requests. QuickUsb.ProcessStream will
// return when either any request has completed or the specified time
// has elapsed.
if (NumThreads == 0)
{
// Check if the next request has completed
bool qResult = qusb.BulkWait(bulkStream[nextRequestToProcess], true); // Don't block
if (!qResult)
{
qusbError = qusb.LastError();
if (qusbError != QuickUsb.Error.NotCompleted)
{
Console.WriteLine("ProcessStream failed with error {0}", qusbError);
}
}
}
}
else
{
// All the requests have completed
bIssueRead.Enabled = true;
bIssueWrite.Enabled = true;
timer.Stop();
// Close the module now that we're done with it
qusb.Close();
}
// Report our data throughput
dataRate.Text = String.Format("Data Rate: {0:0.0} MB/s Overall, {1:0.0} MB/s Instantaneously", overallRate, instRate);
// Dump data to log
lock (log)
{
tbLog.AppendText(log.ToString());
log = new StringBuilder();
}
}
private void timer_Tick(object sender, EventArgs e)
{
// If we are not multithreading the stream in this example, we must
// allow time for processing requests. Processing requests simply
// means checking if a request has completed, execute its completion
// routine, and re-issue the requests. QuickUsb.ProcessStream will
// return when either any request has completed or the specified time
// has elapsed.
if (NumThreads == 0)
{
bool qResult = qusb.ProcessStream(streamID, 50);
if (!qResult)
{
qusbError = qusb.LastError();
Console.WriteLine("ProcessStream failed with error {0}", qusbError);
}
}
// Time data rates
QueryPerformanceCounter(out tEnd);
double tElapsed = (double)(tEnd - tStart) / (double)(freq);
double tElapsedInst = (double)(tEnd - tLast) / (double)(freq);
double overallRate = (TotalKiloBytes / 1024.0) / tElapsed;
double instRate = (InstKiloBytes / 1024.0) / tElapsedInst;
InstKiloBytes = 0;
tLast = tEnd;
// Report our data throughput
dataRate.Text = String.Format("Data Rate: {0:0.0} MB/s Overall, {1:0.0} MB/s Instantaneously", overallRate, instRate);
// Dump data to log
lock (log)
{
tbLog.AppendText(log.ToString());
log = new StringBuilder();
}
}
private void bIssueWrite_Click(object sender, EventArgs e)
{
bool qResult;
qusb = qusbControl.SelectedModule;
tbLog.AppendText(String.Format("********** Issuing {0} async writes **********\n", NumRequests));
// Open the module
qResult = qusb.Open();
if (!qResult)
{
tbLog.AppendText(String.Format("Unable to open module\n", qusbError));
return;
}
// Reset buttons
bIssueRead.Enabled = false;
bIssueWrite.Enabled = true;
// Reset variables
TotalKiloBytes = 0;
ErrorCount = 0;
numPendingRequests = 0;
nextRequestToProcess = 0;
// Set num threads and thread concurrency
qResult = qusb.SetNumAsyncThreads(NumThreads, ThreadConcurrency);
if (!qResult)
{
qusbError = qusb.LastError();
tbLog.AppendText(String.Format("SetNumAsyncThreads failed with error {0}\n", qusbError));
bIssueRead.Enabled = false;
bIssueWrite.Enabled = false;
qusb.Close();
return;
}
// Start throughput timer
QueryPerformanceFrequency(out freq);
QueryPerformanceCounter(out tStart);
// Start streaming data to our user allocated data buffers
for (int k = 0; k < NumRequests; ++k)
{
qResult = qusb.WriteBulkDataAsync(BufferArray[k], BufferByteSize, bulkStream[k], cbDelegate, IntPtr.Zero);
// Check for an error issuing the request
if (!qResult)
{
qusbError = qusb.LastError();
tbLog.AppendText(String.Format("WriteBulkDataAsync failed with error {0}\n", qusbError));
}
else
{
++numPendingRequests;
}
}
// Start timer
timer.Start();
}