DDE

See also Example

Communication control for DDE exchanges with a DDE server applications.

The third-party DDE server does not need to be configured in PcVue.

WebVue support - Yes.

Mode	Mnemonic	Syntax
1	INITIATE	1
2	TERMINATE	2
3	TERMINATEALL	3
4	TIMEOUT	4
5	EXECUTE	5
6	REQUEST	6
7	POKE	7

Syntax 1

LongVal = DDE (Mode, ServiceName, Topicname);

Return type: LONG.

Argument	Meaning
ServiceName	The name of the DDE server. Type STR
TopicName	The name of a DDE topic. Type STR

Execution

Mode	Mnemonic	Action
1	INITIATE	Start a DDE conversation with the named DDE server. The return contains a channel number identifying the conversation.
		Return: 0 if error, else the channel number of the conversation.

Syntax 2

IntVal = DDE (Mode, Channel);

Return type: INTEGER.

Argument	Meaning
Channel	The channel number of a DDE conversation as returned by DDE INITIATE. Type LONG

Execution

Mode	Mnemonic	Action
2	TERMINATE	Terminate a DDE conversation identified by the channel number.
		Return: 0 if error, else OK.

Syntax 3

IntVal = DDE (Mode);

Return type: INTEGER.

Execution

Mode	Mnemonic	Action
3	TERMINATEALL	Terminate all DDE conversations.
		Return: 0 if error, else OK.

Syntax 4

IntVal = DDE (Mode, Channel, Timeout);

Return type: INTEGER.

Argument	Meaning
Channel	The channel number of a DDE conversation as returned by DDE initiate. Type LONG
Timeout	A period expressed in milliseconds. Type LONG

Execution

Mode	Mnemonic	Action
4	TIMEOUT	Modify the conversation timeout for the conversation identified by the channel number.
		Return: 0 if error, else OK.

Syntax 5

IntVal = DDE (Mode, Channel, Command);

Return type: INTEGER.

Argument	Meaning
Channel	The channel number of a DDE conversation as returned by DDE initiate. Type LONG
Command	A string containing an instruction to be sent to the DDE server. Type STR

Execution

Mode	Mnemonic	Action
5	Execute	Request the execution of a command by the DDE server.
		Return: 0 if error, else OK.

Syntax 6

IStrVal = DDE (Mode, Channel, ItemName);

Return type: STRING.

Argument	Meaning
Channel	The channel number of a DDE conversation as returned by DDE initiate. Type LONG
ItemName	A string containing the name of an item. Type STR

Execution

Mode	Mnemonic	Action
6	REQUEST	Request the value of a specific element of a conversation from a DDE server.
		Return: The value of the element.

Syntax 7

IStrVal = DDE (Mode, Channel, ItemName, Data);

Return type: INTEGER.

Argument	Meaning
Channel	The channel number of a DDE conversation as returned by DDE initiate. Type LONG
ItemName	A string containing the name of an item. Type STR
Data	A string containing a new value for the item. Type STR

Execution

Mode	Mnemonic	Action
7	POKE	Write the value of a specific element of a conversation from a DDE server.
		Return: 0 if error, else OK.

Example

For an example, select the Example link above.