# The Python ISAPI package. 

# Exceptions thrown by the DLL framework. 
class ISAPIError(Exception):
    def __init__(self, errno, strerror = None, funcname = None):
        # named attributes match IOError etc. 
        self.errno = errno
        self.strerror = strerror
        self.funcname = funcname
        Exception.__init__(self, errno, strerror, funcname)
    def __str__(self):
        if self.strerror is None:
            try:
                import win32api
                self.strerror = win32api. FormatMessage(self.errno).strip()
            except:
                self.strerror = "no error message is available"
        # str() looks like a win32api error. 
        return str( (self.errno, self.strerror, self.funcname) )
        
class FilterError(ISAPIError):
    pass
    
class ExtensionError(ISAPIError):
    pass

# A little development aid - a filter or extension callback function can
# raise one of these exceptions, and the handler module will be reloaded. 
# This means you can change your code without restarting IIS. 
# After a reload, your filter/extension will have the GetFilterVersion/
# GetExtensionVersion function called, but with None as the first arg. 
class InternalReloadException(Exception):
    pass
