.NET assembly

eGrabber can be used in .NET languages (C#, VB.NET, etc.) via a .NET assembly named Coaxlink_NetApi.dll.

A first example

This example creates a grabber and displays basic information about the interface, device, and remote device modules it contains. This is the C# version of the first C++ EGrabber example:

using System;

namespace FirstExample {
    class ShowInfo {
        const  int CARD_IX = 0;
        const  int DEVICE_IX = 0;

        static  void  showInfo() {
            using (Euresys.EGenTL gentl = new Euresys.EGenTL()) {                         // 1  
                using (Euresys.EGrabberCallbackOnDemand grabber =
                       new Euresys.EGrabberCallbackOnDemand(gentl, CARD_IX, DEVICE_IX)) { // 2
                    String card = grabber.getStringInterfaceModule("InterfaceID");        // 3
                    String dev = grabber.getStringDeviceModule("DeviceID");               // 4  
                    long width = grabber.getIntegerRemoteModule("Width");                 // 5  
                    long height = grabber.getIntegerRemoteModule("Height");               // 5

                    System.Console.WriteLine("Interface:    {0}", card);
                    System.Console.WriteLine("Device:       {0}", dev);
                    System.Console.WriteLine("Resolution:   {0}x{1}", width, height);
                }
            }
        }

        static  void  Main() {
            try {                                                                         // 6  
                showInfo();
            } catch (System.Exception e) {                                                // 6
                System.Console.WriteLine("error: {0}", e.Message);
            }
        }
    }
}

Create a Euresys.EGenTL object. This involves the following operations:

□

locate and dynamically load the Coaxlink GenTL producer (coaxlink.cti);

□

retrieve pointers to the functions exported by coaxlink.cti;

□

initialize coaxlink.cti.

Create a Euresys.EGrabberCallbackOnDemand object. The constructor needs the gentl object we've just created. It also takes as optional arguments the indices of the interface and device to use.

Use GenApi to find out the ID of the Coaxlink card. Notice the InterfaceModule suffix in getStringInterfaceModule. This indicates that we want an answer from the interface module.

Similarly, find out the ID of the device. This time, we use getStringDeviceModule to target the device module.

Finally, read the camera resolution. This time, we use getIntegerRemoteModule because values must be read from the camera.

eGrabber uses exceptions to report errors, so we wrap our code inside a try ... catch block.

Example of program output:

Interface:    PC1633 - Coaxlink Quad G3 (2-camera) - KQG00014
Device:       Device0
Resolution:   4096x4096

Differences between C++ and .NET EGrabber

Following terms are placeholders:

□

MODULE can be replaced by InterfaceModule, DeviceModule...

□

EVENT_DATA can be replaced by NewBufferData, CicData...

EGrabber classes

C++	.NET
`EGrabber<>`	-
`EGrabber<CallbackOnDemand>`	`EGrabberCallbackOnDemand`
`EGrabber<CallbackSingleThread>`	`EGrabberCallbackSingleThread`
`EGrabber<CallbackMultiThread>`	`EGrabberCallbackMultiThread`

EGrabber methods

C++	.NET
`getInfo<MODULE,TYPE>(cmd)`	`getInfoMODULE(cmd, out ...)`
`getInteger<MODULE>(f)`	`getIntegerMODULE(f)`
`getFloat<MODULE>(f)`	`getFloatMODULE(f)`
`getString<MODULE>(f)`	`getStringMODULE(f)`
`getStringList<MODULE>(f)`	`getStringListMODULE(f)`
`setInteger<MODULE>(f, v)`	`setIntegerMODULE(f, v)`
`setFloat<MODULE>(f, v)`	`setFloatMODULE(f, v)`
`setString<MODULE>(f, v)`	`setStringMODULE(f, v)`
`execute<MODULE>(f)`	`executeMODULE(f)`
`enableEvent<EVENT_DATA>()`	`enableEVENT_DATAEvent(f)`
`disableEvent<EVENT_DATA>()`	`disableEVENT_DATAEvent(f)`

Callbacks

In .NET, callbacks are defined as delegates:

grabber.onNewBufferEvent = delegate ...
grabber.onDataStreamEvent = delegate ...
grabber.onCicEvent = delegate ...
grabber.onIoToolboxEvent = delegate ...
grabber.onCxpInterfaceEvent = delegate ...

A complete example is given in the next section.

Single thread callbacks

This program displays basic information about CIC events generated by a grabber, using the CallbackSingleThread model. This is the C# version of the C++ CallbackSingleThread example:

using System;

namespace Callbacks {
    class CallbackExample {
        static  void  showEvents(Euresys.EGrabberCallbackSingleThread grabber) {
            grabber.runScript("config.js");                                           // 1

            grabber.onCicEvent = delegate(Euresys.EGrabberCallbackSingleThread g,     // 2
                                          Euresys.CicData data) {
                System.Console.WriteLine("timestamp: {0} us, {1}",                    // 3
                                         data.timestamp, data.numid);
            };                                                                        // 4

            grabber.enableCicDataEvent();                                             // 5

            grabber.reallocBuffers(3);                                                // 6
            grabber.start();                                                          // 6  
            while (true) {                                                            // 6
            }
        }

        static  void  Main() {
            try {
                using (Euresys.EGenTL gentl = new Euresys.EGenTL()) {
                    using (Euresys.EGrabberCallbackSingleThread grabber =
                           new Euresys.EGrabberCallbackSingleThread(gentl)) {
                        showEvents(grabber);
                    }
                }
            } catch (System.Exception e) {
                System.Console.WriteLine("error: {0}", e.Message);
            }
        }
    }
}

Run a config.js script which should:

□

properly configure the camera and frame grabber;

enable notifications for CIC events.

□

create a delegate that will be called by EGrabber when a CIC event occurs; this delegate will be called with two arguments: the grabber and the CicData containing information about the event;

□

set the grabber's onDataStreamEvent to this delegate function.

In the body of the callback function, simply display basic information about the event.

This ends the definition of the onCicEvent callback function.

Enable onCicEvent callbacks.

Start the grabber and enter an infinite loop. CIC events will be notified in a dedicated thread.

Example of program output:

timestamp: 2790824897 us, EVENT_DATA_NUMID_CIC_CAMERA_TRIGGER_RISING_EDGE
timestamp: 2790824897 us, EVENT_DATA_NUMID_CIC_STROBE_RISING_EDGE
timestamp: 2790824902 us, EVENT_DATA_NUMID_CIC_CXP_TRIGGER_ACK
timestamp: 2790825897 us, EVENT_DATA_NUMID_CIC_STROBE_FALLING_EDGE
timestamp: 2790830397 us, EVENT_DATA_NUMID_CIC_CAMERA_TRIGGER_FALLING_EDGE
timestamp: 2790830401 us, EVENT_DATA_NUMID_CIC_CXP_TRIGGER_ACK
timestamp: 2790842190 us, EVENT_DATA_NUMID_CIC_ALLOW_NEXT_CYCLE
timestamp: 2790842190 us, EVENT_DATA_NUMID_CIC_CAMERA_TRIGGER_RISING_EDGE
timestamp: 2790842191 us, EVENT_DATA_NUMID_CIC_STROBE_RISING_EDGE
timestamp: 2790842195 us, EVENT_DATA_NUMID_CIC_CXP_TRIGGER_ACK