Program Flow

The following figure illustrates the interaction between OS/2 multimedia system components and the Media Control Interface String Test Sample program. Source code is located in the \TOOLKIT\SAMPLES\MM\MCISTRNG subdirectory.

┌──────────────┐
│ String Test  │
│Sample Program│
└─────────┬────┘
         │
(4)│   (1)
┌──┴───────────┐───┌──────────────┐
│ Media Device │(2) │   Command    │
│    Manager   │───│    Table     │
└─────────┬────┘    └──────────────┘
         │
(4)│   (3)
┌──┴───────────┐
│ Media Driver │
│              │
└──────────────┘

• String Test waits for you to enter a string command. When you select Send, the program calls mciSendString to send the string command to the Media Device Manager (MDM).

• The MDM receives the string command and uses the command table to parse the string and convert it to the media control interface command format.

• The Media Device Manager passes the command to the appropriate media driver, which acts on the command.

• Notification messages are sent back to the application from the media device to indicate such operations as completion of a device function or the passing of device ownership from one process to another. These messages can be viewed in the Display Messages dialog box of the String Test Sample.
  

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