Jinshu Zhang wrote in message <36C9EEA8.680E8911_at_vt.edu>...
>Hi Every One
>Could you please give me some advice on using dde in form4.5 if you are
>familiar with it .
>I designed a form called test. There is only one block in this form, And
>there is
>one button called "RUN" and one text item called "SHOW" in that block .
>In the
>WHEN-BUTTON-PRESSED trigger of "RUN" I have the code on the bottom.
>Before I run this form I started microsoft word97. When run this form
>and push the buuton "RUN", I always get the exception of
>DDE.DMLERR_NO_CONV_
>ESTABLISHED ( A client's attempt to establish a conversation has
>failed.The service or
>topic name in a When DDE.INITIATE call may be in error.)
>But when I make the connection from a Microsoft EXCEL macro using the
>same DDE service name and topic name, It is successful.
>Your advice is very appreciated. Thank you in advance.
>
>Jinshu Zhang
>
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>DECLARE
> ConvID PLS_INTEGER;
>BEGIN
> ConvID := DDE.Initiate('winword','system');
>exception
>when DDE.DDE_APP_FAILURE then
> :show:='An application program specified in a DDE.APP_BEGIN call could
>not be started. ';
>When DDE.DDE_APP_NOT_FOUND then
> :show:='An application ID specified in a When DDE.APP_END or When
>DDE.APP_FOCUS call does not correspond to an application that is
>currently running. ';
>When DDE.DDE_FMT_NOT_FOUND then
> :show:='A format number specified in a When DDE.GETFORMATSTR call is
>not known. ';
>When DDE.DDE_FMT_NOT_REG then
> :show:='A format string specified in a When DDE.GETFORMATNUM call does
>not correspond to a predefined format and could not be registered as a
>user-defined format. ';
>when DDE.DDE_INIT_FAILED then
>:show:='The application was unable to initialize DDE communications,
>which caused a call to the DDE layer to fail.';
>when DDE.DDE_PARAM_ERR then
>:show:= 'An invalid parameter, such as a NULL value, was passed to a DDE
>package routine.';
>
>When DDE.DMLERR_BUSY then
> :show:='A transaction failed because the server application was busy.';
>
>When DDE.DMLERR_DATAACKTIMEOUT then
> :show:='A request for a synchronous data transaction has timed out.';
>--When DDE.DMLERR_EXECACK_TIMEOUT then
>-- :show:='A request for a synchronous execute transaction has timed
>out.';
>When DDE.DMLERR_INVALIDPARAMETER then
> :show:='A parameter failed to be validated. Some of the possible
>causes are as follows:';
>-- The application used a data handle initialized with a different
>item-name handle or clipboard data format than that required by the
>transaction.
>
>-- The application used an invalid conversation identifier.
>
>-- More than one instance of the application used the same object.
>
>When DDE.DMLERR_MEMORY_ERROR then
> :show:='A memory allocation failed.';
>When DDE.DMLERR_NO_CONV_ESTABLISHED then
> :show:='A client''s attempt to establish a conversation has failed.'||
> 'The service or topic name in a When DDE.INITIATE call may be in
>error.';
>When DDE.DMLERR_NOTPROCESSED then
> :show:='A transaction failed. The item name in a When DDE.POKE or When
>DDE.REQUEST transaction may be in error.';
>When DDE.DMLERR_POKEACKTIMEOUT then
> :show:='A request for a synchronous When DDE.POKE transaction has timed
>out.';
>When DDE.DMLERR_POSTMSG_FAILED then
> :show:='An internal call to the PostMessage function has failed. ';
>When DDE.DMLERR_SERVER_DIED then
> :show:='The server terminated before completing a transaction. ';
>When DDE.DMLERR_SYS_ERROR then
> :show:='An internal error has occurred in the DDE layer.';
>
>END;
>
>
Received on Wed Feb 17 1999 - 07:36:07 CST
