HP NonStop G-Series - Manual (Page 6)

Contents
vi 110838 Tandem Computers Incorporated
Section 4 Creating Client Applications
Example Application 4-1
DDE Functions 4-4
DDE Initiate Function 4-4
DDE Terminate Function 4-5
DDE Execute Function 4-5
DDE Poke Function 4-7
DDE Request Function 4-9
Example Client Application DDE Function Calls 4-11
Error Handling 4-12
Logging 4-13
Tandem DDE Gateway Failures 4-14
The Tandem DDE Gateway Browser 4-14
Running the Browser 4-14
Configuring the Browser 4-16
Application Design Considerations 4-17
Tandem Transaction Monitoring Facility (TMF) 4-17
Client Application Asynchronous Message Input/Output 4-17
Tandem DDE Gateway Message Buffers 4-18
Client Program Timeout Considerations 4-18
Undefined Filler Areas in Message Buffers 4-18
DDE Poke and DDE Request of Group Data Elements 4-19
Looping Through Subscripted Tables 4-19
Alphanumeric Data Elements Containing Special Characters 4-20
Client Application Literal Limits 4-21
Using Microsoft Excel 4-21
Using Microsoft Visual Basic 4-22
Using Powersoft PowerBuilder 4-22
Section 5 The Tandem DDE Gateway Bridge Program
Preparing Your Data Definition Language (DDL) Source 5-1
TDMGW-IPC Directive 5-2
TDMGW-C-STRINGS Directive 5-2
TDMGW-DDEALIAS Directive 5-3
TDMGW-MESSAGE-FLAG Directive 5-3
TDMGW-ELEMENT-FLAG Directive 5-3
Example DDL Source File 5-3