Made write and read do an implicit open. Added a FileContents attribute to allow simple conversion between an entire file and a string.

xpcom/io/nsIFileSpec.idl

@@ -24,6 +24,7 @@
 
 %{C++
 #include "nsFileSpec.h" // for factory method
+#include "nsIComponentManager.h" // for CreateInstance
 %}
 
 interface nsIFileURL;
@@ -134,13 +135,42 @@ interface nsIDirectoryIterator : nsISupports
 };
 
 %{C++
-// Factory methods
+// Factory methods if you link with xpcom
 NS_COM nsresult NS_NewFileSpecWithSpec(nsFileSpec aSrcFileSpec, nsIFileSpec **result);
 NS_COM nsresult NS_NewFileSpec(nsIFileSpec** result);
 NS_COM nsresult NS_NewDirectoryIterator(nsIDirectoryIterator** result);
 
-#define NS_BOOL_ACCESSOR(_method) { PRBool rv; return NS_SUCCEEDED(f->_method(&rv)) && rv; }
+// Factory methods if you do not link with xpcom. Consider using these
+// with nsCOMPtr, too (though it requires linking with xpcom).
+inline nsIFileSpec* NS_CreateFileSpec()
+{
+    // #include nsIComponentManager.h
+    nsIFileSpec* spec = nsnull;
+    nsresult rv = nsComponentManager::CreateInstance(
+    	(const char*)NS_FILESPEC_PROGID,
+    	(nsISupports*)nsnull,
+    	(const nsID&)nsIFileSpec::GetIID(),
+    	(void**)&spec);
+    NS_ASSERTION(NS_SUCCEEDED(rv), "ERROR: Could not make a file spec.");
+    return spec;
+}
+
+inline nsIDirectoryIterator* NS_CreateDirectoryIterator()
+{
+    // #include nsIComponentManager.h
+    nsIDirectoryIterator* iter = nsnull;
+    nsresult rv = nsComponentManager::CreateInstance(
+    	(const char*)NS_DIRECTORYITERATOR_PROGID,
+    	(nsISupports*)nsnull,
+    	(const nsID&)nsIDirectoryIterator::GetIID(),
+    	(void**)&iter);
+    NS_ASSERTION(NS_SUCCEEDED(rv), "ERROR: Could not make a directory iterator.");
+    return iter;
+}
+
+#define NS_BOOL_ACCESSOR(_method) { PRBool yes; return NS_SUCCEEDED(f->_method(&yes)) && yes; }
 inline PRBool Exists(nsIFileSpec* f) NS_BOOL_ACCESSOR(exists)
 inline PRBool Exists(nsIDirectoryIterator* f) NS_BOOL_ACCESSOR(exists)
 inline PRBool IsDirectory(nsIFileSpec* f) NS_BOOL_ACCESSOR(isDirectory)
+
 %}