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- DDEWatch 1.0
- Horizon Technologies Inc.
-
- Overview:
- DDEWatch is a Microsoft Windows program designed to monitor
- Dynamic Data Exchange (DDE) messages. It is a useful tool
- to aid in the development of DDE based applications. 'C'
- language programmers, Excel macro developers and others can
- use DDEWatch as both a debugging tool and a way to learn
- DDE.
-
- DDEWatch displays each DDE message as it occurs. The
- information displayed contains the window handles of both
- the sender and receiver, the message type and any additional
- parameters. These parameters include keyword
- representations of flag fields, command strings, data
- format, and data strings. DDEWatch displays each new DDE
- message below the previous one. When the screen is full,
- the next message replaces the first. A line separates the
- first and last messages captured.
-
- DDEWatch also displays a list of the client-server window
- handles of all active DDE sessions. DDEWatch maintains this
- list to reflect every new DDE session detected. When a DDE
- session ends, DDEWatch removes the client-server window
- handles from the list.
-
- Using DDEWatch:
- After invoking DDEWatch, choose Watch from the File menu.
- DDEWatch now displays all DDE message traffic in real time.
- The DDEWatch display is divided vertically into two
- sections.
-
- The left section of the display shows a list of active DDE
- sessions. The hexadecimal numbers are the client and server
- window handles. The following figure shows two active
- sessions: Client "630c" communicating with Server "2f30",
- and Client "5f10" communicating with the same server.
-
- ---------------------------------------------------------------------
- | - | DDEWatch | \/ | /\ |
- ---------------------------------------------------------------------
- | File |
- ---------------------------------------------------------------------
- | Client Server |630c<-2f30 Data Advise AckReq Release Fmt=Te|
- |---------------|5f10->2f30 Request Fmt=Text|Position |
- |* 630c 2f30 |5f10<-2f30 Data Response AckReq Release Fmt=|
- |* 5f10 2f30 |5f10->2f30 Ack App=00|Position |
- | |5f10->2f30 Execute "[l][d]" |
- | |5f10<-2f30 Ack App=00|"[l][d]" |
- | |630c->2f30 Ack App=00|0 |
- ---------------------------------------------------------------------
- |<-| ||| |->|
- ---------------------------------------------------------------------
-
- The asterisk to the left of the client numbers indicates
- that DDEWatch is displaying messages for that session. To
- suppress the display for a particular session, position the
- mouse pointer over the client-server pair and click the left
- mouse button. To resume the display, repeat the procedure.
-
- The right section of the DDEWatch display shows detailed
- information about each DDE message. The client's window
- handle is always to the left of the server's. The arrow
- shows the direction of the message. A left arrow (<-)
- indicates a message from the server to the client. A right
- arrow (->) indicates a message from the client to the
- server.
-
- The type of message and its parameters are shown immediately
- to the right of the window handles. The parameters are
- dependant on the type of message and are listed in the
- following table:
-
- Message Type Parameters
- ------------------------------------------------------------------------
- |Initiate | Application Name
- | | (vertical bar)
- | | Topic Name
- |---------------+-------------------------------------------------------
- |Terminate | (nothing)
- |---------------+-------------------------------------------------------
- |Advise | AckReq (iff the fAckReq bit is set)
- | | DeferUpd (iff the fDeferUpd bit is set)
- | | Fmt=format name,* or number for a nonstandard format
- | | (vertical bar)
- | | Item Name
- |---------------+-------------------------------------------------------
- |Unadvise | Item Name
- |---------------+-------------------------------------------------------
- |Ack (Initiate) | Application Name
- | | (vertical bar)
- | | Topic Name
- |---------------+-------------------------------------------------------
- |Ack (Execute) | Negative (iff fAck is not set)
- | | (Busy) (iff fBusy is set)
- | | App=xx (where xx is the hex value of bAppReturnCode)
- | | (vertical bar)
- | | "Command string"
- |---------------+-------------------------------------------------------
- |Ack (Other) | Negative (iff fAck is not set)
- | | (Busy) (iff fBusy is set)
- | | App=xx (where xx is the hex value of bAppReturnCode)
- | | (vertical bar)
- | | Item Name
- |---------------+-------------------------------------------------------
- |Data | Response (iff fResponse is set)
- | | Advise (iff fResponse is not set)
- | | AckReq (iff fAckReq is set)
- | | Release (iff fRelease is set)
- | | Fmt=format name*, or number for a nonstandard format
- | | "Data" (iff the format of the data is text)
- | | (vertical bar)
- | | Item Name
- |---------------+-------------------------------------------------------
- |Request | Fmt=format name*, or number if a nonstandard format
- | | (vertical bar)
- | | Item Name
- |---------------+-------------------------------------------------------
- |Poke | Release (iff fRelease is set)
- | | Fmt=format name*, or number for a nonstandard format
- | | "Data" (iff the format of the data is text)
- | | (vertical bar)
- | | Item Name
- |---------------+-------------------------------------------------------
- |Execute | "Command string"
- ------------------------------------------------------------------------
- * The standard format names that are displayed for the
- DDE messages Advise, Data, Request and Poke are Text,
- BitMap, MetaFile, Sylk, Dif, Tiff and OemText
-
- To pause the displaying of messages for all sessions,
- position the mouse pointer over the right section of the
- DDEWatch display and hold the left mouse button down. To
- resume, release the button.
-
-
- DDEWatch - Copyright (C) 1990 Horizon Technologies Inc. All rights reserved.
- (517) 347-0800
-