ICogAcqFifo.Acquire Method

ICogAcqFifo Acquire Method

Cognex VisionPro

Acquire a new image.

Namespace: Cognex.VisionPro
Assembly: Cognex.VisionPro.Core (in Cognex.VisionPro.Core.dll) Version: 65.1.0.0

Syntax

ICogImage Acquire(
	out int triggerNumber
)

ICogImage Acquire(
	out int triggerNumber
)

Function Acquire ( 
	<OutAttribute> ByRef triggerNumber As Integer
) As ICogImage

Function Acquire ( 
	<OutAttribute> ByRef triggerNumber As Integer
) As ICogImage

ICogImage^ Acquire(
	[OutAttribute] int% triggerNumber
)

ICogImage^ Acquire(
	[OutAttribute] int% triggerNumber
)

Parameters

triggerNumber: Type: System Int32
A trigger sequence number.

Return Value

Type: ICogImage

The acquired image.

Events

Event Type	Reason
ICogAcqFifo Complete	The acquisition request completed, possibly unsuccessfully.
ICogAcqFifo MovePart	Fired when the camera's field of view can be changed without affecting the acquired image.
ICogAcqFifo Overrun	Fired from an acquisition FIFO when a trigger is missed or an overrun occurs.

Exceptions

Exception	Condition
CogAcqTimeoutException	Timeout period expired.
CogAcqWrongTriggerModelException	Trigger model is Auto or Slave.
CogAcqOverrunException	A trigger could not be serviced.
CogAcqAbnormalException	The acquisition failed because of a fault in the acquisition hardware or because of some other unusual problem.
CogAcqEncoderOverrunException	Encoder overrun.
CogAcqInvalidROIException	The region of interest is not valid.
CogAcqOtherFifoErrorException	There was an error in another FIFO in the same master/slave group.
CogAcqTooManyStartsException	No more acquisition requests can be made. The limit is 32 acquisition requests.

Remarks

Acquires a new image. This method waits until an image is acquired. To start an acquisition without waiting, use StartAcquire and CompleteAcquire(Int32, Int32 , Int32 ).

Examples

C++

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using Cognex.VisionPro;

private CogFrameGrabbers myFrameGrabbers;
private ICogFrameGrabber myFrameGrabber;
private ICogAcqFifo myAcqFifo;

private void AcquireDisplay () {
    const string VIDEO_FORMAT = "Sony XC75 640x480";
    int    tNum;

    myFrameGrabbers = new CogFrameGrabbers();
    myFrameGrabber = myFrameGrabbers[0];
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);

    cogDisplay1.Image = myAcqFifo.Acquire(out tNum);
}

using Cognex.VisionPro;

private CogFrameGrabbers myFrameGrabbers;
private ICogFrameGrabber myFrameGrabber;
private ICogAcqFifo myAcqFifo;

private void AcquireDisplay () {
    const string VIDEO_FORMAT = "Sony XC75 640x480";
    int    tNum;

    myFrameGrabbers = new CogFrameGrabbers();
    myFrameGrabber = myFrameGrabbers[0];
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);

    cogDisplay1.Image = myAcqFifo.Acquire(out tNum);
}

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Imports Cognex.VisionPro

Private myFrameGrabbers As CogFrameGrabbers
Private myFrameGrabber As Cognex.VisionPro.ICogFrameGrabber
Private myAcqFifo As Cognex.VisionPro.ICogAcqFifo

Private Sub AcquireDisplay()
    Const VIDEO_FORMAT = "Sony XC75 640x480"
    Dim tNum As Integer

    myFrameGrabbers = New CogFrameGrabbers
    myFrameGrabber = myFrameGrabbers.Item(0)
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, CogAcqFifoPixelFormatConstants.Format8Grey, 0, False)

    CogDisplay1.Image = myAcqFifo.Acquire(tNum)
End Sub

Imports Cognex.VisionPro

Private myFrameGrabbers As CogFrameGrabbers
Private myFrameGrabber As Cognex.VisionPro.ICogFrameGrabber
Private myAcqFifo As Cognex.VisionPro.ICogAcqFifo

Private Sub AcquireDisplay()
    Const VIDEO_FORMAT = "Sony XC75 640x480"
    Dim tNum As Integer

    myFrameGrabbers = New CogFrameGrabbers
    myFrameGrabber = myFrameGrabbers.Item(0)
    myAcqFifo = myFrameGrabber.CreateAcqFifo(VIDEO_FORMAT, CogAcqFifoPixelFormatConstants.Format8Grey, 0, False)

    CogDisplay1.Image = myAcqFifo.Acquire(tNum)
End Sub