A scanner must first be selected by calling the ImGearIsisScannerSession setScanner method in order for the ImGearIsisScannerSession scan method to work or any of the ImGearIsisScanner methods to work. When a scanner is selected, the ImGearIsisScanner selected property returns true. A scanner can be unloaded by calling the unload method.
The setScanner method has two overloads. You can specify a load option for a scanner selection dialog or to specify that the currently selected scanner should be used. This is demonstrated below:
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function onScannerLoaded(status) { if (status.get_status() !== ImageGear.Web.Isis.ImGearIsisStatus.Completed) { alert(status.get_statusMessage()); } // The scanner can now be accessed through the ImGearIsisScannerSession scanner property. var scanner = scannerSession.get_scanner(); // You could use the getTag method or getAllTags method here // to get the current scanner settings. } // Show the scanner selection dialog with a list of connected drivers. scannerSession.setScannerWithDialog( ImageGear.Web.Isis.ImGearIsisLoadScannerOption.ShowConnectedDriverList, onScannerLoaded); |
Another option is to pass an ImGearIsisScanner object to change to the specified scanner without showing a dialog. You can get a collection of connected scanners and a collection of undetected scanners by calling the ImGearIsisScannerSession getScanners method. This is demonstrated below, where “scannerSelect” is an HTML DOM <select> object:
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var scanners; ... function ButtonGetScanners_onclick() { function getScannersCallback(connectedDevices, undetectedDevices, status) { if (status.get_status() !== ImageGear.Web.Isis.ImGearIsisStatus.Completed) { alert(status.get_statusMessage()); } var select = document.getElementById('scannerSelect'); // Store the scanners so one of them can be set later. scanners = connectedDevices; for (var i = 0; i < connectedDevices.get_length(); i++) { var scanner = connectedDevices.getScanner(i); var option = document.createElement(‘option’); var scannerName = scanner.get_name(); option.text = scannerName; select.add(option, null); } } // Get a list of connected scanners and add each to a list box. var operationStatus = scannerSession.getScanners(getScannersCallback); } function ButtonSetConnectedScanner_onclick() { function onScannerLoaded(status) { if (status.get_status() !== ImageGear.Web.Isis.ImGearIsisStatus.Completed) { alert(status.get_statusMessage()); } // The scanner can now be accessed through the ImGearIsisScannerSession scanner property. var scanner = scannerSession.get_scanner(); // You could use the getTag method or getAllTags method here // to get the current scanner settings. } var select = document.getElementById('scannerSelect'); var selectedScanner = scanners.getScanner(select.selectedIndex); // Set the scanner that is selected in the connected list. scannerSession.setScanner(selectedScanner, onScannerLoaded); } |