Cleaned ResultWindow's code up.

cocoa/base/ResultWindow.h

@@ -32,12 +32,17 @@ http://www.hardcoded.net/licenses/bsd_license
     ProblemDialog *problemDialog;
 }
 - (id)initWithParentApp:(AppDelegateBase *)app;
+
+/* Virtual */
+- (void)initResultColumns;
+- (void)setScanOptions;
+- (NSString *)getScanErrorMessageForCode:(NSInteger)errorCode;
+
 /* Helpers */
 - (void)fillColumnsMenu;
 - (NSTableColumn *)getColumnForIdentifier:(NSInteger)aIdentifier title:(NSString *)aTitle width:(NSInteger)aWidth refCol:(NSTableColumn *)aColumn;
 - (NSArray *)getColumnsOrder;
 - (NSDictionary *)getColumnsWidth;
-- (void)initResultColumns;
 - (void)restoreColumnsPosition:(NSArray *)aColumnsOrder widths:(NSDictionary *)aColumnsWidth;
 - (void)sendMarkedToTrash:(BOOL)hardlinkDeleted;
 - (void)updateOptionSegments;

cocoa/base/ResultWindow.m

@@ -44,6 +44,26 @@ http://www.hardcoded.net/licenses/bsd_license
     [super dealloc];
 }
 
+/* Virtual */
+- (void)initResultColumns
+{
+}
+
+- (void)setScanOptions
+{
+}
+
+- (NSString *)getScanErrorMessageForCode:(NSInteger)errorCode
+{
+    if (errorCode == 0) {
+        return nil;
+    }
+    if (errorCode == 3) {
+        return @"The selected directories contain no scannable file.";
+    }
+    return @"Unknown Error.";
+}
+
 /* Helpers */
 - (void)fillColumnsMenu
 {
@@ -96,11 +116,6 @@ http://www.hardcoded.net/licenses/bsd_license
     return result;
 }
 
-- (void)initResultColumns
-{
-    // Virtual
-}
-
 - (void)restoreColumnsPosition:(NSArray *)aColumnsOrder widths:(NSDictionary *)aColumnsWidth
 {
     for (NSMenuItem *mi in [columnsMenu itemArray]) {
@@ -344,7 +359,17 @@ http://www.hardcoded.net/licenses/bsd_license
 
 - (IBAction)startDuplicateScan:(id)sender
 {
-    // Virtual
+    if ([py resultsAreModified]) {
+        if ([Dialogs askYesNo:@"You have unsaved results, do you really want to continue?"] == NSAlertSecondButtonReturn) // NO
+            return;
+    }
+    [self setScanOptions];
+    NSInteger r = n2i([py doScan]);
+    NSString *errorMsg = [self getScanErrorMessageForCode:r];
+    if (errorMsg != nil) {
+        [[ProgressController mainProgressController] hide];
+        [Dialogs showMessage:errorMsg];
+    }
 }
 
 - (IBAction)switchSelected:(id)sender