Subroutine
Make a one-time data request.
call DDERequest ( ConvID_IV, ItemName_SV, Format_SV, Status_IV)
•ConvID_IV is an integer value representing the conversation ID assigned by the DDE DLL.
•ItemName_SV is a non-zero-length string specifying the item name, which should have some meaning to the server. It must not be more than 80 characters.
•Format_SV is a string value representing one of the formats listed below (defined in ESLDDE.INC), or any format string that references a text-based format that has been registered through a call to DDERegisterFormat. Normally, DDEFMT_TEXT is used for plain text. Formats defined in ESLDDE.INC are:
DDEFMT_TEXT
DDEFMT_DIF
DDEFMT_OEMTEXT
DDEFMT_SYLK
•Status_IV must be 0.
Description
Called by the client. This subroutine makes a one-time data request. Upon receipt of a one-time data request, the DDE protocol requires that the server respond as follows. The client should not attempt another DDE exchange until the server has responded with one of these events.
Acknowledgment |
Subroutine Called |
Message |
Positive (Request can be honored) |
DDEAck with DDE_FACK status flag set |
WM_DDE_ACK with DDE_FACK status bit set |
Negative (Request cannot be honored) |
DDEAck with DDE_FACK status flag not set |
WM_DDE_ACK with DDE_FACK status bit cleared |
Message
Posts a WM_DDE_REQUEST message to the server partner.
Example
response to RequestKey
# Get ConvID_IV
if (not (ConvID_IV = 0)) then # make sure a conversation
# is active
copy "itemname" to ItemName_SV
copy DDEFMT_TEXT to Format_SV
copy 0 to Status_IV
call DDERequest (ConvID_IV, ItemName_SV, Format_SV, Status_IV)
end if
