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Dreate a dll program or something similar 2
- Thread starter benny7
- Start date
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1
- #2
Mike Lewis
Programmer
Benny,
Certainly. You need to write a COM DLL. Essentially, this is a VFP class which as been flagged as OLEPUBLIC. You'll find more information about how to do that in the Help.
It's best to put this class in its own project file. When you are ready to build it, click the Build button in the project manager and select the COM Server DLL option. You will end up with a DLL that you can either use immediately or distribute (and register) on your users' systems.
In general, any COM-compliant program can call the methods of your DLL, passing parameters and receiving replies as necessary. It won't matter to the caller which language the original code was in.
I hope this helps. It is just a quick overview. There is more info in the Help.
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
Certainly. You need to write a COM DLL. Essentially, this is a VFP class which as been flagged as OLEPUBLIC. You'll find more information about how to do that in the Help.
It's best to put this class in its own project file. When you are ready to build it, click the Build button in the project manager and select the COM Server DLL option. You will end up with a DLL that you can either use immediately or distribute (and register) on your users' systems.
In general, any COM-compliant program can call the methods of your DLL, passing parameters and receiving replies as necessary. It won't matter to the caller which language the original code was in.
I hope this helps. It is just a quick overview. There is more info in the Help.
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
- Thread starter
- #3
Mike Lewis
Programmer
Benny,
If you are writing the class in a PRG, add the keyword OLEPUBLIC to the DEFINE CLASS.
If you are using the visual class designer, go into the Class Info dialogue (on the Class menu) and tick "OLE Public".
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
If you are writing the class in a PRG, add the keyword OLEPUBLIC to the DEFINE CLASS.
If you are using the visual class designer, go into the Class Info dialogue (on the Class menu) and tick "OLE Public".
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
- Thread starter
- #5
Sorry, I'm going to sound really stupid here. But all I'm doing is opening a table, selecting some data, and creating a text file. I have now forms or anything like that, just dozen or so lines in a program. Do I have to define a classs??? I've never done this before, not too sure what you mean.
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1
- #6
Mike Gagnon
Programmer
BENNY7
Yes, but you want this in a dll, so a few extra steps are required.
Take a look at faq184-3381
Mike Gagnon
If you want to get the best response to a question, please check out FAQ184-2483 first.
Yes, but you want this in a dll, so a few extra steps are required.
Take a look at faq184-3381
Mike Gagnon
If you want to get the best response to a question, please check out FAQ184-2483 first.
Mike Lewis
Programmer
Benny,
Yes, you really do need to define a class. That's the only way you can get create a DLL in VFP.
There are two ways to go about it. You can write the class as a program, using DEFINE CLASS. Or you can use the visual class designer (type CREATE CLASS in the Command Window).
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
Yes, you really do need to define a class. That's the only way you can get create a DLL in VFP.
There are two ways to go about it. You can write the class as a program, using DEFINE CLASS. Or you can use the visual class designer (type CREATE CLASS in the Command Window).
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
- Thread starter
- #8
Silly question, is somehting like below correct then:
Dll compiled OK.
Define Class MyClass as Form OLEPUBLIC
Procedure CreateData
LPARAMETERS SEARCHDESC
set safety off
use stock in 0
SELECT STOCK
select * from STOCK into cursor temp where upper(DESCR) like "%" + SEARCHDESC +"%"
COPY TO temp.txt TYPE DELIM
USE IN STOCK
EndDefine
Then in program where dll is being used I've put :
DECLARE INTEGER CreateData IN test.DLL String
a= CreateData("O")
messagebox(str(a))
The a= CreateData("O") creates an error. This is below:
cannot find entry point CreateData in the DLL
Sorry if I sound bit silly, just can't work this out
Dll compiled OK.
Define Class MyClass as Form OLEPUBLIC
Procedure CreateData
LPARAMETERS SEARCHDESC
set safety off
use stock in 0
SELECT STOCK
select * from STOCK into cursor temp where upper(DESCR) like "%" + SEARCHDESC +"%"
COPY TO temp.txt TYPE DELIM
USE IN STOCK
EndDefine
Then in program where dll is being used I've put :
DECLARE INTEGER CreateData IN test.DLL String
a= CreateData("O")
messagebox(str(a))
The a= CreateData("O") creates an error. This is below:
cannot find entry point CreateData in the DLL
Sorry if I sound bit silly, just can't work this out
Mike Gagnon
Programmer
Take a look at thread184-940775 Olaf's comment in regards to creating cursors with a COM.
Mike Gagnon
If you want to get the best response to a question, please check out FAQ184-2483 first.
Mike Lewis
Programmer
Benny,
Silly question, is somehting like below correct then:
This is not at all silly. The whole area is quite complicated, and asking these questions is a good way to understand it.
Define Class MyClass as Form OLEPUBLIC
etc. etc.
EndDefine
That part looks completely OK to me (except that you will need to USE the Stock table before you can reference it).
Then in program where dll is being used I've put :
DECLARE INTEGER CreateData IN test.DLL String
a= CreateData("O")
messagebox(str(a))
etc.
No. This is not correct. Because you are specifically creating a COM DLL, you will have to call it like this:
oSearch = CREATEOBJECT("MyProject.MyClass")
&& MyProject.DLL is the name of the DLL
oSearch.CreateData()
Of course, if you want to call it from another language, you can simply translate the above code to the appropriate syntax.
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
Silly question, is somehting like below correct then:
This is not at all silly. The whole area is quite complicated, and asking these questions is a good way to understand it.
Define Class MyClass as Form OLEPUBLIC
etc. etc.
EndDefine
That part looks completely OK to me (except that you will need to USE the Stock table before you can reference it).
Then in program where dll is being used I've put :
DECLARE INTEGER CreateData IN test.DLL String
a= CreateData("O")
messagebox(str(a))
etc.
No. This is not correct. Because you are specifically creating a COM DLL, you will have to call it like this:
oSearch = CREATEOBJECT("MyProject.MyClass")
&& MyProject.DLL is the name of the DLL
oSearch.CreateData()
Of course, if you want to call it from another language, you can simply translate the above code to the appropriate syntax.
Mike
Mike Lewis
Edinburgh, Scotland
My Visual Foxpro web site: My Crystal Reports web site:
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