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DATASNAP Class not registered
- Thread starter matiasUTN
- Start date
First of all let me point out that I am not sure if what you will read below will help you or not. I just thought I'd share some thoughts since no one else has replied to this question yet.
I know of two reasons which cause "Class not registered" error.
Reason 1:
You are using an ActiveX or other COM object which is not registered in the computer you
run your program.
Reason 2:
You or the components you use are trying to load a delphi object from a stream and that
objects delphi class is not registered by default in your program.
I think in your case its probably "Reason 1". I have never used DATASNAP so i can NOT be
sure. I searched a little on the internet for you because I found it interesting to learn
about and it appears that DATASNAP server side requires that you deploy "MIDAS.DLL" on the
server machine and also on the Client machine (unless you use MidasLib unit in which case
you would not need it in the client machine)[see also Ref 1 below]. I think you will need
Use regsvr32.exe to register Midas.DLL as it contains COM objects (see also Ref 2,3 and 4).
If it is "reason 2" then you would typically see a message "[ClassName] class is not
registered" which would tell you the class you will need to register. And to register it
you can add the following code at the begining of your program :
RegisterClass(ClassName)
Web References:
[1]
[2]
read/fc5b3d7e7bd8fa6f/5e345321cd5d9e0b%235e345321cd5d9e0b
[3]
read/938e83c341c9f2ff/8fcc266ed9f1f533%238fcc266ed9f1f533
[4]
d/117c37037275bd36/133839f1a3b839c3%23133839f1a3b839c3
I hope the above will help you or at the very least i hope it wont cause more confusion.
Good luck
I know of two reasons which cause "Class not registered" error.
Reason 1:
You are using an ActiveX or other COM object which is not registered in the computer you
run your program.
Reason 2:
You or the components you use are trying to load a delphi object from a stream and that
objects delphi class is not registered by default in your program.
I think in your case its probably "Reason 1". I have never used DATASNAP so i can NOT be
sure. I searched a little on the internet for you because I found it interesting to learn
about and it appears that DATASNAP server side requires that you deploy "MIDAS.DLL" on the
server machine and also on the Client machine (unless you use MidasLib unit in which case
you would not need it in the client machine)[see also Ref 1 below]. I think you will need
Use regsvr32.exe to register Midas.DLL as it contains COM objects (see also Ref 2,3 and 4).
If it is "reason 2" then you would typically see a message "[ClassName] class is not
registered" which would tell you the class you will need to register. And to register it
you can add the following code at the begining of your program :
RegisterClass(ClassName)
Web References:
[1]
[2]
read/fc5b3d7e7bd8fa6f/5e345321cd5d9e0b%235e345321cd5d9e0b
[3]
read/938e83c341c9f2ff/8fcc266ed9f1f533%238fcc266ed9f1f533
[4]
d/117c37037275bd36/133839f1a3b839c3%23133839f1a3b839c3
I hope the above will help you or at the very least i hope it wont cause more confusion.
Good luck
- Thread starter
- #3
Before nothing, thanks for your help BledaZemi. I was watching links, but I did not find anything that no longer has done. Of all ways I have decided to publish following so that they can see what it is happening to me.
Greetings
Greetings
whosrdaddy
Vendor
Ok, this is a difficult one.
Examining the code, this happens when you set the active property to true of the DCOM connection:
so it will call the CreateRemoteComObject procedure with a computername/ip address and a CSLID.
searching the net, I stumbled on this link :
while this is not the solution to your problem, I think you need to fiddle with DCOMCNFG and its settings for your DCOM server.
Cheers,
Daddy
-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!
Examining the code, this happens when you set the active property to true of the DCOM connection:
Code:
procedure TDCOMConnection.DoConnect;
begin
if (FObjectBroker <> nil) then
begin
repeat
if FComputerName = '' then
FComputerName := FObjectBroker.GetComputerForGUID(GetServerCLSID);
try
SetAppServer(CreateRemoteComObject(ComputerName, GetServerCLSID) as IDispatch);
FObjectBroker.SetConnectStatus(ComputerName, True);
except
FObjectBroker.SetConnectStatus(ComputerName, False);
FComputerName := '';
end;
until Connected;
end else if (ComputerName <> '') then
SetAppServer(CreateRemoteComObject(ComputerName, GetServerCLSID) as IDispatch) else
inherited DoConnect;
end;so it will call the CreateRemoteComObject procedure with a computername/ip address and a CSLID.
searching the net, I stumbled on this link :
while this is not the solution to your problem, I think you need to fiddle with DCOMCNFG and its settings for your DCOM server.
Cheers,
Daddy
-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!
whosrdaddy
Vendor
an other one with the same problem:
-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!
-----------------------------------------------------
What You See Is What You Get
Never underestimate tha powah of tha google!
Once more just a thought to share.
Since it works with a computer name and not with IP a possible workaround would be to find the computer name given its IP. I dont know if that is acceptable to your case.
Here is one link which seems to show how to get ComputerName from IP , I havent tested it, so it may or may not work:
Since it works with a computer name and not with IP a possible workaround would be to find the computer name given its IP. I dont know if that is acceptable to your case.
Here is one link which seems to show how to get ComputerName from IP , I havent tested it, so it may or may not work:
- Thread starter
- #7
thanks friends: I have been proving several alternatives to solve the problem, and I have not been able. The peculiar thing is that when making changes in the code of the DCOM server, when I return to compile, this one returns the code to its original format.
I have proven to do the following thing in the Server_TLB.pas: 1 Change the MachineName by the IP
2 Use ipaddr instead of MachineName
and one series of changes more than has not been. In any case I have decided to continue using like MachineName the hostname not to suspend my project. More ahead I will return on the subject. Greetings and thanks.
I have proven to do the following thing in the Server_TLB.pas: 1 Change the MachineName by the IP
2 Use ipaddr instead of MachineName
and one series of changes more than has not been. In any case I have decided to continue using like MachineName the hostname not to suspend my project. More ahead I will return on the subject. Greetings and thanks.
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