I also see that cancel does not work as for the other import filters. I take a look at this issue.

Btw. sounds strange that start kmailcvt from terminal make a difference. If the UI freeze: could you check the CPU consumtion of the process? Is there any load?

The CPU consumtion of the process looks no difference from common when UI freezing.

Btw. When I run kmailcvt from terminal and cancel the OS X Mail import filter,nothing will happen.But after canceling any of other import filter,it will appear a dialog,it says:No directory selected.It looks a differentia exists here...

Thnaks for your replying.

SVN commit 586087 by dkukawka:

Fixed handling if the KFileDialog is canceled by the user and
added some more checks if the user cancel the import to get a 
better interactivity and a faster stop of import.

BUG:130892



 M  +80 -63    filter_mailapp.cxx  
 M  +1 -1      filter_mailapp.hxx  


--- branches/KDE/3.5/kdepim/kmailcvt/filter_mailapp.cxx #586086:586087
@@ -47,86 +47,100 @@
     bool first_msg = true;
 
     QString directory = KFileDialog::getExistingDirectory( QDir::homeDirPath(), info->parent() );
-    info->setOverall(0);
 
-    //   kdDebug() << "starting by looking in directory " << directory << endl;
-    traverseDirectory(directory);
+    //qDebug("starting by looking in directory: %s", directory.latin1());
+    if ( directory.isEmpty() ) {
+        info->addLog( i18n("No directory selected."));
+        info->addLog( i18n("No files found for import."));
+    } else {
+        info->setOverall(0);
+        traverseDirectory(info, directory);
 
-    for ( QStringList::Iterator filename = mMboxFiles.begin(); filename != mMboxFiles.end(); ++filename, ++currentFile) {
-        if ( info->shouldTerminate() ) break;
-        QFile mbox( *filename );
-        if (! mbox.open( IO_ReadOnly ) ) {
-            info->alert( i18n("Unable to open %1, skipping").arg( *filename ) );
-        } else {
-            QFileInfo filenameInfo( *filename );
-            kdDebug() << "importing filename " << *filename << endl;
-            QStringList name = QStringList::split("/", *filename);
-            QString folderName(name[name.count() - 2]);
+        for ( QStringList::Iterator filename = mMboxFiles.begin(); filename != mMboxFiles.end(); ++filename, ++currentFile) {
+            if ( info->shouldTerminate() ) break;
+            QFile mbox( *filename );
+            if (! mbox.open( IO_ReadOnly ) ) {
+                info->alert( i18n("Unable to open %1, skipping").arg( *filename ) );
+            } else {
+                QFileInfo filenameInfo( *filename );
+                kdDebug() << "importing filename " << *filename << endl;
+                QStringList name = QStringList::split("/", *filename);
+                QString folderName(name[name.count() - 2]);
 
-            info->setCurrent(0);
-            info->addLog( i18n("Importing emails from %1...").arg( *filename ) );
-            info->setFrom( *filename );
-            info->setTo( folderName );
+                info->setCurrent(0);
+                info->addLog( i18n("Importing emails from %1...").arg( *filename ) );
+                info->setFrom( *filename );
+                info->setTo( folderName );
 
-            QByteArray input(MAX_LINE);
-            long l = 0;
+                QByteArray input(MAX_LINE);
+                long l = 0;
 
-            while ( ! mbox.atEnd() ) {
-                KTempFile tmp;
-                /* comment by Danny:
-                * Don't use QTextStream to read from mbox, etter use QDataStream. QTextStream only 
-                * support Unicode/Latin1/Locale. So you lost information from emails with 
-                * charset!=Unicode/Latin1/Locale (e.g. KOI8-R) and Content-Transfer-Encoding != base64 
-                * (e.g. 8Bit). It also not help to convert the QTextStream to Unicode. By this you
-                * get Unicode/UTF-email but KMail can't detect the correct charset.
-                */
-                QCString seperate;
+                while ( ! mbox.atEnd() ) {
+                    KTempFile tmp;
+                    /* comment by Danny:
+                    * Don't use QTextStream to read from mbox, etter use QDataStream. QTextStream only 
+                    * support Unicode/Latin1/Locale. So you lost information from emails with 
+                    * charset!=Unicode/Latin1/Locale (e.g. KOI8-R) and Content-Transfer-Encoding != base64 
+                    * (e.g. 8Bit). It also not help to convert the QTextStream to Unicode. By this you
+                    * get Unicode/UTF-email but KMail can't detect the correct charset.
+                    */
+                    QCString seperate;
 
-                if(!first_msg)
+                    if(!first_msg)
+                        tmp.file()->writeBlock( input, l );
+                    l = mbox.readLine( input.data(),MAX_LINE); // read the first line, prevent "From "
                     tmp.file()->writeBlock( input, l );
-                l = mbox.readLine( input.data(),MAX_LINE); // read the first line, prevent "From "
-                tmp.file()->writeBlock( input, l );
 
-                while ( ! mbox.atEnd() &&  (l = mbox.readLine(input.data(),MAX_LINE)) && ((seperate = input.data()).left(5) != "From ")) {
-                    tmp.file()->writeBlock( input, l );
-                }
-                tmp.close();
-                first_msg = false;
+                    while ( ! mbox.atEnd() &&  (l = mbox.readLine(input.data(),MAX_LINE)) && ((seperate = input.data()).left(5) != "From ")) {
+                        tmp.file()->writeBlock( input, l );
+                    }
+                    tmp.close();
+                    first_msg = false;
 
-                /* comment by Danny Kukawka:
-                 * addMessage() == old function, need more time and check for duplicates
-                 * addMessage_fastImport == new function, faster and no check for duplicates
-                 */
-                if(info->removeDupMsg)
-                    addMessage( info, folderName, tmp.name() );
-                else
-                    addMessage_fastImport( info, folderName, tmp.name() );
+                    // force stop if user chancel the import
+                    if ( info->shouldTerminate() ) {
+                    tmp.unlink(); 
+                    break;
+                    }
 
-                tmp.unlink();
+                    /* comment by Danny Kukawka:
+                    * addMessage() == old function, need more time and check for duplicates
+                    * addMessage_fastImport == new function, faster and no check for duplicates
+                    */
+                    if(info->removeDupMsg)
+                        addMessage( info, folderName, tmp.name() );
+                    else
+                        addMessage_fastImport( info, folderName, tmp.name() );
 
-                int currentPercentage = (int) ( ( (float) mbox.at() / filenameInfo.size() ) * 100 );
-                info->setCurrent( currentPercentage );
-                if (currentFile == 1)
-                    overall_status = (int)( currentPercentage*((float)currentFile/mMboxFiles.count()));
-                else
-                    overall_status = (int)(((currentFile-1)*(100.0/(float)mMboxFiles.count()))+(currentPercentage*(1.0/(float)mMboxFiles.count())));
-                info->setOverall( overall_status );
-                if ( info->shouldTerminate() ) break;
-            }
+                    tmp.unlink();
 
-            info->addLog( i18n("Finished importing emails from %1").arg( *filename ) );
-            if (count_duplicates > 0) {
-                info->addLog( i18n("1 duplicate message not imported to folder %1 in KMail", 
-                                   "%n duplicate messages not imported to folder %1 in KMail", count_duplicates).arg(folderName));
+                    int currentPercentage = (int) ( ( (float) mbox.at() / filenameInfo.size() ) * 100 );
+                    info->setCurrent( currentPercentage );
+                    if (currentFile == 1)
+                        overall_status = (int)( currentPercentage*((float)currentFile/mMboxFiles.count()));
+                    else
+                        overall_status = (int)(((currentFile-1)*(100.0/(float)mMboxFiles.count()))+(currentPercentage*(1.0/(float)mMboxFiles.count())));
+                    info->setOverall( overall_status );
+                    if ( info->shouldTerminate() ) break;
+                }
+
+                info->addLog( i18n("Finished importing emails from %1").arg( *filename ) );
+                if (count_duplicates > 0) {
+                    info->addLog( i18n("1 duplicate message not imported to folder %1 in KMail", 
+                                    "%n duplicate messages not imported to folder %1 in KMail", count_duplicates).arg(folderName));
+                }
+                count_duplicates = 0;
+                mbox.close();
             }
-            count_duplicates = 0;
-            mbox.close();
         }
     }
+    
     if (info->shouldTerminate()) info->addLog( i18n("Finished import, canceled by user."));
+    info->setCurrent(100);
+    info->setOverall(100);
 }
 
-void FilterMailApp::traverseDirectory(const QString &dirName)
+void FilterMailApp::traverseDirectory(FilterInfo *info, const QString &dirName)
 {
     QDir dir(dirName);
     dir.setFilter(QDir::Dirs | QDir::Files);
@@ -134,13 +148,16 @@
     const QFileInfoList *fileinfolist = dir.entryInfoList();
     QFileInfoListIterator it(*fileinfolist);
     QFileInfo *fi;
+
+    if ( info->shouldTerminate() ) return;
+
     while ((fi = it.current())) {
         if (fi->fileName() == "." || fi->fileName() == "..") {
             ++it;
             continue;
         }
         if (fi->isDir() && fi->isReadable()) {
-            traverseDirectory(fi->filePath());
+            traverseDirectory(info, fi->filePath());
         } else {
             if (!fi->isDir() && fi->fileName() == "mbox") {
                 kdDebug() << "adding the file " << fi->filePath() << endl;
--- branches/KDE/3.5/kdepim/kmailcvt/filter_mailapp.hxx #586086:586087
@@ -30,7 +30,7 @@
 
 private:
     QStringList mMboxFiles;
-    void traverseDirectory(const QString &);
+    void traverseDirectory(FilterInfo *info, const QString &);
 };
 
 #endif