Prevent KRender from continually trying to open a process if the url does not point to a file.

svn path=/branches/release-0_2_0/kdenlive/; revision=168

kdenlive/kmmtimeline.cpp

@@ -16,6 +16,7 @@
  ***************************************************************************/
 
 #include <cmath>
+#include <stdlib.h>
 
 #include <klocale.h>
 #include <qscrollbar.h>

kdenlive/krender.cpp

@@ -15,13 +15,15 @@
  *                                                                         *
  ***************************************************************************/
 
+#include <kio/netaccess.h> 
 #include "krender.h"
 
 #include <kdebug.h>
 
 KRender::KRender(KURL appPath, unsigned int port, QObject *parent, const char *name ) :
-																				QObject(parent, name),
-																				QXmlDefaultHandler()
+			QObject(parent, name),
+			QXmlDefaultHandler(),
+			m_appPathInvalid(false)
 {
 	startTimer(200);
 	m_parsing = false;
@@ -150,12 +152,19 @@ void KRender::processExited()
 /** Launches a renderer process. */
 void KRender::launchProcess()
 {
+	if(m_appPathInvalid) return;
+	  
+	if(!KIO::NetAccess::exists(m_appPath)) {
+		kdError() << "Application '" << m_appPath.path() << "' does not exist" << endl;
+		m_appPathInvalid = true;
+		return;
+	}
+	
 	m_process.clearArguments();
 	m_process.setExecutable("artsdsp");
-  m_process << m_appPath.path();
-  m_process << "-d";  
-  m_process << "-p " << m_portNum;
-
+	m_process << m_appPath.path();
+	m_process << "-d";  
+	m_process << "-p" << QString::number(m_portNum);
 
 	kdDebug() << "Launching process " << m_appPath.path() << " as server on port " << m_portNum << endl;
 	if(m_process.start(KProcess::NotifyOnExit, KProcess::AllOutput)) {

kdenlive/krender.h

@@ -96,7 +96,7 @@ private: // Private attributes
   /** The socket that will connect to the server */
   QSocket m_socket;
   /** If we have started our own renderer, this is it's process */
-	KProcess m_process;
+  KProcess m_process;
   /** The port number used to connect to the renderer */
   unsigned int m_portNum;
   /** The XML reader */
@@ -113,6 +113,9 @@ private: // Private attributes
   QDomDocument m_sceneList;
   /** Holds the buffered communication from the socket, ready for processing. */
   QString m_buffer;
+  /** Becomes true if it is known that the application path does not point to a valid file, false if
+      this is unknown, or if a valid executable is known to exist */
+  bool m_appPathInvalid;
   
   /** A function pointer to the relevant method that should parse tagOpen events */
   bool (KRender::*m_funcStartElement)(const QString & namespaceURI, const QString & localName,