Small fixes and documentation improvements.

README.md

@@ -56,11 +56,25 @@ $ npm install pdf-fill-form
 > Homebrew users who get error regarding xcb-shm  
 > The fix is to add this to your bash profile / environment: export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig
 
-###Linux (Ubuntu/Debian)
+###Linux - Ubuntu (trusty)
 ```
 $ sudo apt-get install libpoppler-qt4-dev libcairo2-dev
 $ npm install pdf-fill-form
 ```
+###Linux - Debian (wheezy)
+We need newer Poppler library than the current in Wheezy distribution: 
+
+```
+$ sudo add-apt-repository "deb http://http.debian.net/debian wheezy-backports main"     
+$ sudo apt-get update
+```
+Then install packages
+
+```
+$ sudo apt-get install libcairo2-dev
+$ sudo apt-get -t wheezy-backports install libpoppler-qt4-dev 
+$ npm install pdf-fill-form
+```
 ##Todo
 * Tests
 * Refactoring

src/NodePoppler.cc

@@ -56,12 +56,21 @@ static cairo_status_t writePngToBuffer(void *closure, const unsigned char *data,
 }
 
 void createPdf(QBuffer *buffer, Poppler::Document *document) {
-
+  ostringstream ss;
+
   Poppler::PDFConverter *converter = document->pdfConverter();
   converter->setPDFOptions(converter->pdfOptions() | Poppler::PDFConverter::WithChanges);
   converter->setOutputDevice(buffer);
   if (!converter->convert()) {
-    throw "Error occurred while trying to create form filled PDF";
+    // enum Error
+    // {
+    //     NoError,
+    //     FileLockedError,
+    //     OpenOutputError,
+    //     NotSupportedInputFileError
+    // };    
+    ss << "Error occurred when converting PDF: " << converter->lastError();
+    throw ss.str();    
   }
 }