added some exceptions to handle errors

examples/attachtest.cpp

@@ -9,23 +9,35 @@
 using namespace std;
 #include <DFTypes.h>
 #include <DFHackAPI.h>
+#include <DFError.h>
 
 int main (void)
 {
     time_t start, end;
     double time_diff;
     DFHack::API DF("Memory.xml");
-    if(!DF.Attach())
+    //if(!DF.Attach())
+    //{
+    //    cerr << "DF not found" << endl;
+    //    return 1;
+    //}
+    //if(!DF.Detach())
+    //{
+    //    cerr << "Can't detach from DF" << endl;
+    //    return 1;
+    //}
+    
+    try
     {
-        cerr << "DF not found" << endl;
-        return 1;
+        DF.Attach();
+        DF.Detach();
     }
-    if(!DF.Detach())
+    catch (DFHack::Error::NoProcess& e)
     {
-        cerr << "Can't detach from DF" << endl;
+        cerr << e.what() << endl;
         return 1;
     }
-    
+
     // attach/detach test
     cout << "Testing attach/detach"  << endl;
     time(&start);

library/CMakeLists.txt

@@ -2,6 +2,7 @@
 
 SET(PROJECT_HDRS
 DFCommonInternal.h
+DFError.h
 DFHackAPI.h
 DFMemInfo.h
 DFMemInfoManager.h

library/DFError.h

@@ -0,0 +1,55 @@
+/*
+www.sourceforge.net/projects/dfhack
+Copyright (c) 2009 Petr Mrázek (peterix), Kenneth Ferland (Impaler[WrG]), dorf
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any
+damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any
+purpose, including commercial applications, and to alter it and
+redistribute it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must
+not claim that you wrote the original software. If you use this
+software in a product, an acknowledgment in the product documentation
+would be appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and
+must not be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
+*/
+
+#ifndef ERROR_H_INCLUDED
+#define ERROR_H_INCLUDED
+
+#include <string>
+#include <exception>
+
+namespace DFHack
+{
+    namespace Error
+    {
+        class NoProcess : public exception
+        {
+        public:
+            virtual const char* what() const throw()
+            {
+                return "couldn't find a suitable process";
+            }
+        };
+
+        class CantAttach : public exception
+        {
+        public:
+            virtual const char* what() const throw()
+            {
+                return "couldn't attach to process";
+            }
+        };
+    }
+}
+
+#endif // ERROR_H_INCLUDED

library/DFHackAPI.cpp

@@ -23,6 +23,7 @@ distribution.
 */
 
 #include "DFCommonInternal.h"
+#include "DFError.h"
 using namespace DFHack;
 
 class API::Private
@@ -1369,14 +1370,16 @@ bool API::Attach()
     // find a process (ProcessManager can find multiple when used properly)
     if (!d->pm->findProcessess())
     {
-        cerr << "couldn't find a suitable process" << endl;
-        return false;
+        throw Error::NoProcess();
+        //cerr << "couldn't find a suitable process" << endl;
+        //return false;
     }
     d->p = (*d->pm) [0];
     if (!d->p->attach())
     {
-        cerr << "couldn't attach to process" << endl;
-        return false; // couldn't attach to process, no go
+        throw Error::CantAttach();
+        //cerr << "couldn't attach to process" << endl;
+        //return false; // couldn't attach to process, no go
     }
     d->offset_descriptor = d->p->getDescriptor();
     // process is attached, everything went just fine... hopefully