java reading barcode from image

java barcode reader from image

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Since the web page had already been formatted as a template for the CGI-based MapServer application, it was easy to import that file directly into a multiline string. In order to populate this string with appropriate values, format codes are inserted where a value should be. The values can be form variables or any piece of information you d like to place in front of the viewer. When this string is processed for output to the browser, MapScript scans it and searches for format codes. When it finds one, it replaces it with a value from the array specified on Line 243. The web page is now sent back to the browser via the Apache web server, and the user sees a page that is almost identical to the page displayed by the CGI-based MapServer application (as shown in Figure 7-2).

Any control that initiates an Ajax request can point to an <a4j:status> component. In the following example, as you type, the state list is updated and a status message appears:

s Note There is another approach you could take with releases, but it would complicate the application

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Now, let s assume that the user changes the zoom state from Pan to Zoom In and clicks somewhere on the map image. When this happens, the Apache server receives the request from the browser and executes the script. The first part of the script (up to Line 057) is executed just as before, but now, when execution reaches the if statement, the method parms.getfirst() returns a true value, since the form variables img.x, img.y, or refresh will have been returned from the browser. Therefore, execution of the if block proceeds to Line 059. 057 if (parms.getfirst('img.x') and parms.getfirst('img.y')) \ 058 or parms.getfirst('refresh'): 059 if parms.getfirst('refresh'):# refresh, fake the coordinates 060 clickx = 320 061 clicky = 240 062 else: # map click, use real coordinates 063 clickx = int( parms.getfirst('img.x') ) 064 clicky = int( parms.getfirst('img.y') ) If the user had clicked Refresh, then parms.getfirst('refresh') would return a true value and the code in Lines 060 and 061 would assign fake image coordinates (at the center of the image) to the variables clickx and clicky. But in this case, you re assuming that the coordinates of the click point are returned because the user clicks on the map. Since the name of the input field containing the map image is img, the coordinates are returned as the values of form variables img.x and img.y. Lines 063 and 064 then save these values in clickx and clicky. The pointObj, clkpoint, was created in Line 044. Its coordinate values are now set to clickx and clicky in Lines 067 and 068. 067 068 clkpoint.x = clickx clkpoint.y = clicky

Line 071 retrieves a list of layers that the user has chosen to display by clicking the appropriate check boxes. These layer names are concatenated into the space-delimited string, layers, in Line 072. 071 072 layerlist = parms.getlist('layer') layers = " ".join(layerlist)

The <a4j:support> component has a status attribute that points to an ID of the <a4j:status> component: <h:form> <rich:panel style="width:500px"> <f:facet name="header">Using a4j:status</f:facet> <h:panelGrid columns="2"> <h:outputText value="Enter state:" /> <h:panelGroup> <h:inputText value="#{stateView.input}"> <a4j:support event="onkeyup" reRender="box" action="#{stateView.suggest}" status="stateStatus" /> </h:inputText> <rich:spacer width="10px" /> <a4j:status id="stateStatus" startText="Working..." startStyle="background-color:#ffA500"/> </h:panelGroup> </h:panelGrid> </rich:panel> </h:form> <h:dataTable id="box" value="#{stateView.statesList}" var="state"> <h:column> <h:graphicImage value="#{state.flagImage}" /> </h:column> <h:column> #{state.name} </h:column> <h:column> #{state.capital} </h:column> </h:dataTable>

In Line 073, the Python string-comparison method find() is used to search for the string 'urbanareas' in layers. If it s found, then the variable urbanareas is set to CHECKED. Remember, if you want this layer to be checked when you generate the web page again, you must set the value of urbanareas. Next, the mapObj method getLayerByName() is used to retrieve a pointer (this_layer) to the layer named urbanareas. The pointer is then used to access the status of the layer and set it to on by assigning the value 1 to layer status. On the other hand, if the string 'urbanareas' isn t found, this means that the user has unchecked the urbanareas check box. In this case, the variable urbanareas is set to the empty string, and the layer status is set to off by assigning it the value 0. This is repeated for the other layers. 073 074 075 076 077 if layers.find('urbanareas') > -1: urbanareas = "CHECKED" this_layer = map.getLayerByName('urbanareas') this_layer.status = 1 else:

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