Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario descargar pdf (Pagina 224)

II. SOFTWARE GUIDES - 10. Driver488/W31 10D. Getting Started

Personal488 User’s Manual, Rev. 3.0 II-209

If you require event handling support, use the custom control written for event handling. The IEEE

488 Event Custom Control support is included in the following file:

IOTEVENT.VBX

This file should be included in the Project Window. For more information on using the IEEE 488

Event Custom Control, turn to the topic “IEEE 488 Event Custom Control” found in the following Sub-

Chapter “Visual Basic” in this Chapter.

Accessing from a Windows Program

The structure of a Windows program generally dictates that actions take place in response to messages

such as an operator key press, mouse action, menu selection, etc. This discussion covers the basic

actions needed to control Driver488/W31. How these actions are combined and coordinated in

response to Windows messages, is up to the application designer.

Opening & Closing the Driver

The first Driver488/W31 programming example is designed for simplicity. Its sole purpose is to verify

proper communication with the driver, and upon closing, remove the driver from memory.

In every C program using Driver488/W31, header files of declarations must be merged into the

program. In the following example, those declarations have been omitted from the listing for the sake

of brevity.

With the associated source files, the following program can be built using the file

EXAMPLE1.MAK

(for

Microsoft C or Quick C users) or

EXAMPLE1.PRJ

(for Borland C users) found on the Driver488/W31

disk.

This example has several declarations that will be used later:

HWND hDriver /* handle for Driver488/W31 */

DevHandleT ieee; /* handle for the IEEE board * /

char hellomsg[256]; /* string to hold the hello response */

10E. C Languages

Topics

• Accessing from a Windows Program ....................................... II-208

Opening & Closing the Driver....................................................................II-208

• Establishing Communications .................................................. II-209

• Confirming Communications.................................................... II-211

• IEEE 488 Event Message............................................................. II-211

• Reading Driver Status................................................................. II-213

• External Device Initialization................................................... II-214

• Basic Data Acquisition................................................................ II-214

• Block Data Acquisition............................................................... II-215

• Sample Programs ......................................................................... II-216

Data Acquisition Sample Programs .........................................................II-216

IEEE 488 Event Message Sample Programs.............................................II-224

• Command Summary .................................................................... II-231

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 399 400

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