[fdo-users] Write FDO Provider

[Jackie Ng]

Your entry point would be something like:

extern "C" MY_API FdoIConnection* CreateConnection()
{
     return new MyFdoConnection();
}

This is the function signature that FDO is looking for. MY_API would be a
#defined symbol like:

#ifdef _WIN32
#define MY_API __declspec(dllexport)
#else
#define MY_API
#endif

- Jackie


Davidow wrote:
> 
> Thanks, your help is very good
> 
> Aber ich habe noch eine frage
> 
> How I can define an externally accessible entry point that returns a new
> instance of your class?
> 
> 
> 
> 
> 
> Jackie Ng wrote:
>> 
>> I have not written a FDO provider before, but I can tell you what
>> constitutes a FDO provider (at the source code level)
>> 
>> - You need to implement a class that derives from FdoIConnection, this is
>> your main interface and everything else in your provider flows on from
>> this main interface.
>> - You need to implement FdoIConnectionInfo which describes this
>> connection and how to connect.
>> - You need to implement all the capability interfaces that say what this
>> provider can and can't do.
>> - You need to define an externally accessible entry point that returns a
>> new instance of your class. This entry point needs to be exported from
>> your dll so the provider registry can get to it.
>> - You need to implement these commands for a minimally functioning
>> provider, the commands you implement should match what your capability
>> interfaces are saying:
>>    - FdoISelect
>>    - FdoIDescribeSchema
>> - You should be familiar with FDO memory management (smart pointers,
>> reference counting, etc)
>> 
>> Unfortunately, you have to do all of this in C++, there are some tools
>> that can assist. 
>> 
>> 1) There is a FDO provider template under
>> Utilities\Common\FDOProviderTemplate unfortunately this hasn't been
>> updated for quite a while now. 
>> 
>> 2) There is a helper library for providers in Utilities\Common that has a
>> bunch of classes commonly used by providers.
>> 
>> It also doesn't hurt to go through the source code of other providers.
>> You'll notice repeatable patterns that can be applied to your own
>> provider.
>> 
>> Hope that helps.
>> 
>> - Jackie
>> 
>> 
>> Davidow wrote:
>>> 
>>> How to develop a new custom FDO provider for a specific data source? Can
>>> I get some Getting started samples or walk-through exercises for writing
>>> a custom FDO provider.
>>> 
>>> I will write a new custom FDO provider for DFX Format.
>>> Are there any .Net template wizards for writing a new custom FDO
>>> provider? I am in need of a detailed explanation about the development
>>> process. 
>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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