Release 10.1A: OpenEdge Development:
Programming Interfaces

Accessing Windows named pipes

To access a Windows named pipe, you create it, connect it, read it, write it, and close it. Table 11–1 lists these tasks and their C and 4GL equivalents.

Table 11–1: Using C and 4GL to access Windows named pipes

Task	C	4GL
Create	CreateNamedPipe()	None
Connect	ConnectNamedPipe()	None
Read	ReadFile() FlushFileBuffers()	INPUT FROM
Write	WriteFile()	OUTPUT TO
Close	CloseHandle()	INPUT CLOSE OUTPUT CLOSE

As Table 11–1 shows, C lets you create, connect, read, write, and close Windows named pipes, while the 4GL lets you read, write, and close them.

Actually, the 4GL lets you perform all the tasks in the table if you use the 4GL’s access to DLLs to call into kernel32.dll, which contains all the C functions in the table.