Hi,
I try to print a document to a ps file and to convert it into jpeg by
the 'convert' command. But I found 'convert' was run before the ps
file became available. I implemented
nsIWebProgressListener#onStateChange and waited until the STATE_STOP
flag was set, but it did not work. Is there a way to be notified when
the print is complete?
var ifreq =
_content.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
var webBrowserPrint =
ifreq.getInterface(Components.interfaces.nsIWebBrowserPrint);
var printService = Components.classes['@mozilla.org/gfx/
printsettings-service;1']
.getService(Components.interfaces.nsIPrintOptions);
var printSettings = printService.CreatePrintSettings();
printSettings.toFileName = this.tmpFile;
printSettings.printToFile = true;
printSettings.printSilent = true;
...
printSettings.showPrintProgress = false;
this.printCallback.init(this);
try {
webBrowserPrint.print(printSettings, this.printCallback);
} catch (e) {}
// implements nsIWebProgressListener
printCallback: {
pobj: null,
init: function (pobj) {
this.pobj = pobj;
},
onLocationChange: function () {},
onProgressChange: function () {},
onSecurityChange: function () {},
onStatusChange: function () {},
onStateChange: function (aWebProgress, aRequest, aStateFlags,
aStatus) {
const nsIWebProgressListener =
Components.interfaces.nsIWebProgressListener;
if ((aStateFlags & nsIWebProgressListener.STATE_STOP)
&& (aStateFlags & nsIWebProgressListener.STATE_IS_DOCUMENT)) {
// do postprocess when the print is complete
this.pobj.printPostProcess();
}
}
},
// convert ps into jpg
printPostProcess: function () {
var cvtF = Components.classes["@mozilla.org/file/local;1"]
.createInstance(Components.interfaces.nsILocalFile);
cvtF.initWithPath("/usr/bin/convert");
var myProcess = Components.classes["@mozilla.org/process/util;1"]
.getService(Components.interfaces.nsIProcess);
myProcess.init (cvtF);
var args = [this.tmpFile, "/tmp/output.jpg"];
myProcess.run(true, args, args.length);
}
Thanks in advance.
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