How's the right syntax for setting camera parameters

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Chewy 2015-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/244840-how-s-the-right-syntax-for-setting-camera-parameters

编辑： Chewy 2015-9-24

I want to set other parameters for my Basler acA1600-60gm camera. I'm using the GigE-functionality of the Image Akquisition App of Matlab:

% Initialisierung Kamera
imaqreset;
% Setzt alle Einstellungen bezüglich der imaq-Module zurück
gigecamlist;
% Zeigt alle GigE-Kameras an
cam = gigecam;
% Erzeugt ein gigecam-Objekt mit den Namen cam

As next I want to change the area of interest. As you see I tried several functions:

cam.AutoFunctionAOIHeight.SetValue = 500
% Setzen der Y-Breite (Höhe des Bildes)
cam.AutoFunctionAOIWidth.SetValue = [ int32(500) ]
% Setzen der X-Breite (Breite des Bildes)
cam.AutoFunctionAOIOffsetX.SetValue = [ int32(200) ]
% Setzen des X-Offsets (Koordinate der linken oberen Ecke der AoI bezogen
% auf Gesamtsensor
cam.AutoFunctionAOIOffsetY.SetValue = [ int32(300) ]
% Setzen des Y-Offsets (Koordinate der linken oberen Ecke der AoI     bezogen auf Gesamtsensor

But I get the following error:

Warning: Struct field assignment overwrites a value with class
"int32". See MATLAB R14SP2 Release Notes, Assigning Nonstructure
Variables As Structures Displays Warning, for details. 
> In A1_Bildaufnahme_GigE (line 25) 
Error using A1_Bildaufnahme_GigE (line 25)
AutoFunctionAOIHeight should be numeric.

The parameters are presented like followed:

get(cam)
     AcquisitionFrameRateAbs = 10
     AcquisitionFrameRateEnable = False
     AcquisitionStatusSelector = FrameTriggerWait
     ActionCommandCount = 1
     ActionDeviceKey = 0
     ActionGroupKey = 0
     ActionGroupMask = 0
     ActionSelector = 1
     AutoExposureTimeAbsLowerLimit = 35
     AutoExposureTimeAbsUpperLimit = 350000
     AutoFunctionAOIHeight = 600
     AutoFunctionAOIOffsetX = 1
     AutoFunctionAOIOffsetY = 1
     AutoFunctionAOISelector = AOI1
     AutoFunctionAOIUsageIntensity = True
     AutoFunctionAOIUsageRedLightCorrection = (Currently not accessible)
     AutoFunctionAOIUsageWhiteBalance = False
     AutoFunctionAOIWidth = 1600
......