Measurement-computing DAQFlex User Guide Manuel d'utilisateur télécharger pdf (Page 25)

DAQFlex Software User's Guide DAQFlex Software Reference

If using a device that does not have an ID assigned, you must use the NameOnly or NameAndSerno

format with the DaqDeviceManager.CreateDevice() method in order to create the device. A device

with no ID will not be created when using the NameAndID and NameSernoAndID format with

CreateDevice().

DaqDeviceManager.CreateDevice()

Creates a DaqDevice object. The DaqDevice object contains the methods used to configure, read data

from, or write data to a device. With the DaqDevice object, all DAQ operations are configured using one

API method called DaqDevice.SendMessage() rather than using multiple operation-specific methods.

SendMessage() takes a single parameter called message. This parameter is a text-based command that

the DAQ device parses to configure a particular operation.

C#:

static CreateDevice(string deviceName);

VB:

Shared Function CreateDevice(ByVal deviceName As String) As DaqDevice

Parameter

deviceName

One of the device names returned by the DaqDeviceManager.GetDevicenames() method.

Return value

An instance of a DaqDevice object.

Remarks

 Depending on the DeviceNameFormat, the CreateDevice() method creates a DaqDevice object for

the device whose name, name and serial number, name and id, or name, serial number and id are

contained in the deviceName parameter.

 The resources associated with the DaqDevice object can be freed by calling the ReleaseDevice()

method.

 The CreateDevice() method can only be called once for a specific device, unless the ReleaseDevice()

method is called.

 If CreateDevice() is called more than once for a specific device without calling ReleaseDevice(), the

DaqDevice object throws an exception, indicating that a driver handle has already been created for

the device.

Refer to the following sample code:

try

{

MyDevice = DaqDeviceManager.CreateDevice(deviceName);

}

catch (Exception ex)

{

// handle exception

}

Try

MyDevice = DaqDeviceManager.CreateDevice(deviceName)

Catch Ex As Exception

' handle exception

End Try

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Measurement-computing DAQFlex User Guide Manuel d'utilisateur Page 25

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