--- a/PDFViewer/pdfviewer/PDFViewer.m
+++ b/PDFViewer/pdfviewer/PDFViewer.m
@@ -20,7 +20,13 @@
     NSMutableString *strings = [[NSMutableString alloc] init];
     NSUInteger nOps = [[self document] pageCount];
     
-    [strings appendString:[NSString stringWithFormat:@"Genosse Parteisekretär, das Dokument hat %lu Seiten", nOps]];
+    NSString *salutation = [self getSalutation];
+    
+    if (nOps > 0) {
+        [strings appendString:[NSString stringWithFormat:@"%@, das Dokument hat %lu Seiten", salutation, nOps]];
+    } else {
+        [strings appendString:[NSString stringWithFormat:@"%@, laden Sie ein Dokument mit MAC-O", salutation]];
+    }
     
     for (int pages = 0; pages < nOps; pages++) {
         PDFPage *page = [[self document] pageAtIndex:pages];
@@ -45,9 +51,8 @@
             
             // neues PDF laden
             NSURL* url = [[panel URLs] objectAtIndex:0];
-            PDFDocument *doc = [[PDFDocument alloc] initWithURL:url];
+            [self loadUrl:url];
             
-            [self setDocument:doc];
             [self startSpeaking:nil];
         }
     }];
@@ -104,4 +109,44 @@
     return inputStr;
 }
 
+- (NSString*) getSalutation {
+    NSString *fullName = NSFullUserName();
+    NSArray<NSString*> *array = [fullName componentsSeparatedByString:@" "];
+
+    NSString *name = @"Parteisekretär";
+    
+    if (array != NULL) {
+        if ([array count] >= 1) {
+            name = [array objectAtIndex:1];
+        }
+    }
+    
+    NSString *salutation = [NSString stringWithFormat:@"Genosse %@", name];
+    
+    return salutation;
+}
+
+- (BOOL) loadUrl: (NSURL*) url {
+    PDFDocument *doc = [[PDFDocument alloc] initWithURL:url];
+    
+    [self silence];
+    [self setDocument:doc];
+    
+    return (doc != NULL);
+}
+
+- (void) showErrorMessage: (NSString*) message {
+    NSAlert *alert = [[NSAlert alloc] init];
+    [alert setMessageText:message];
+    [alert setInformativeText:@"Fehler"];
+    [alert runModal];
+}
+
+- (void) showDebugMessage: (NSString*) message {
+    NSAlert *alert = [[NSAlert alloc] init];
+    [alert setMessageText:message];
+    [alert setInformativeText:@"Debug"];
+    [alert runModal];
+}
+
 @end