Merge pull request #324 from prey/picture-retry

Windows report picture retry

lib/agent/providers/webcam/windows/index.js

@@ -1,13 +1,26 @@
-var exec = require('child_process').exec,
+var fs   = require('fs'),
+    exec = require('child_process').exec,
     join = require('path').join;
 
 exports.get_picture = function(file, callback){
 
-  var cmd = '"' + join(__dirname, '/prey-webcam.exe') + '"';
-  cmd += ' -invalid youcam,cyberlink,google -frame 10 -outfile ' + file;
+  var exes = ['/prey-wecam.exe', '/snapshot.exe'],
+      opts = [' -invalid youcam,cyberlink,google -frame 10 -outfile ', ' /T '];
 
-  exec(cmd, function(err) {
-    callback(err, 'image/jpeg'); // if err exists, content_type will not matter
-  })
+  var picture_command = function(index) {
+    return '"' + join(__dirname, exes[index]) + '"' +  opts[index] + file;
+  }
 
-}
+  var take_picture = function(method) {
+    exec(picture_command(method), function(err) {
+      if (!fs.existsSync(file) && method == 0) {
+        file = file.replace(/.jpg/g, '');
+        take_picture(1);
+      } else
+        callback(err, 'image/jpeg'); // if err exists, content_type will not matter
+    })
+  }
+
+  take_picture(0);
+
+}