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78 lines
3.6 KiB
Plaintext
78 lines
3.6 KiB
Plaintext
The [[_OPENCLIENT]] function connects to a Host on the Internet as a Client and returns the Client status handle.{{PageSyntax}}
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:{{Parameter|clientHandle&}} = [[_OPENCLIENT]]('''"TCP/IP:8080:12:30:1:10"''')
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{{PageDescription}}
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*An [[ERROR Codes|Illegal Function Call]] error will be triggered if the function is called with a string argument of the wrong syntax.
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*Connects to a host somewhere on the internet as a client.
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*Valid {{Parameter|clientHandle&}} values are negative. 0 means that the connection failed. Always check that the handle returned is not 0.
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*[[CLOSE]] client_handle closes the client. A failed handle of value 0 does not need to be closed.
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{{PageExamples}}''Example 1:'' Attempting to connect to a local host(your host) as a client. A zero return indicates failure.{{CodeStart}}
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client = {{Cl|_OPENCLIENT}}("TCP/IP:7319:localhost")
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{{Cl|IF...THEN|IF}} client {{Cl|THEN}}
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{{Cl|PRINT}} "[Connected to " + {{Cl|_CONNECTIONADDRESS}}(client) + "]"
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{{Cl|ELSE}} {{Cl|PRINT}} "[Connection Failed!]"
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{{Cl|END IF}} '' ''
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{{CodeEnd}}
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:'''NOTE:''' Try a valid TCP/IP port setting to test this routine!
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''Example 2:'' Using a "raw" Download function to download the QB64 bee image and displays it.{{CodeStart}}
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'' ''
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'replace the fake image address below with a real image address you want to download
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{{Cl|IF...THEN|IF}} Download("www.qb64.org/qb64.png", "qb64logo.png", 10) {{Cl|THEN}} ' timelimit = 10 seconds
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{{Cl|SCREEN}} {{Cl|_LOADIMAGE}}("qb64logo.png",32)
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{{Cl|ELSE}}: {{Cl|PRINT}} "Couldn't download image."
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{{Cl|END IF}}
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{{Cl|SLEEP}}
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{{Cl|SYSTEM}}
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' ---------- program end -----------
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{{Cl|FUNCTION}} Download (url$, file$, timelimit) ' returns -1 if successful, 0 if not
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url2$ = url$
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x = {{Cl|INSTR}}(url2$, "/")
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{{Cl|IF...THEN|IF}} x {{Cl|THEN}} url2$ = {{Cl|LEFT$}}(url$, x - 1)
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client = {{Cl|_OPENCLIENT}}("TCP/IP:80:" + url2$)
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{{Cl|IF...THEN|IF}} client = 0 {{Cl|THEN}} {{Cl|EXIT FUNCTION}}
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e$ = {{Cl|CHR$}}(13) + {{Cl|CHR$}}(10) ' end of line characters
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url3$ = {{Cl|RIGHT$}}(url$, {{Cl|LEN}}(url$) - x + 1)
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x$ = "GET " + url3$ + " HTTP/1.1" + e$
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x$ = x$ + "Host: " + url2$ + e$ + e$
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{{Cl|PUT (TCP/IP statement)|PUT}} #client, , x$
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t! = {{Cl|TIMER}} ' start time
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{{Cl|DO}}
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{{Cl|_DELAY}} 0.05 ' 50ms delay (20 checks per second)
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{{Cl|GET (TCP/IP statement)|GET}} #client, , a2$
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a$ = a$ + a2$
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i = {{Cl|INSTR}}(a$, "Content-Length:")
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{{Cl|IF...THEN|IF}} i {{Cl|THEN}}
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i2 = {{Cl|INSTR}}(i, a$, e$)
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{{Cl|IF...THEN|IF}} i2 {{Cl|THEN}}
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l = {{Cl|VAL}}({{Cl|MID$}}(a$, i + 15, i2 - i -14))
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i3 = {{Cl|INSTR}}(i2, a$, e$ + e$)
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{{Cl|IF...THEN|IF}} i3 {{Cl|THEN}}
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i3 = i3 + 4 'move i3 to start of data
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{{Cl|IF...THEN|IF}} ({{Cl|LEN}}(a$) - i3 + 1) = l {{Cl|THEN}}
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{{Cl|CLOSE}} client ' CLOSE CLIENT
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d$ = {{Cl|MID$}}(a$, i3, l)
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fh = {{Cl|FREEFILE}}
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{{Cl|OPEN}} file$ {{Cl|FOR}} {{Cl|OUTPUT}} {{Cl|AS}} #fh: {{Cl|CLOSE}} #fh ' erase existing file?
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{{Cl|OPEN}} file$ {{Cl|FOR}} {{Cl|BINARY}} {{Cl|AS}} #fh
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{{Cl|PUT}} #fh, , d$
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{{Cl|CLOSE}} #fh
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Download = -1 'indicates download was successfull
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{{Cl|EXIT FUNCTION}}
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{{Cl|END IF}} ' availabledata = l
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{{Cl|END IF}} ' i3
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{{Cl|END IF}} ' i2
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{{Cl|END IF}} ' i
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|TIMER}} > t! + timelimit ' (in seconds)
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{{Cl|CLOSE}} client
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{{Cl|END FUNCTION}} '' ''
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{{CodeEnd}}{{PageSeeAlso}}
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*[[_OPENHOST]], [[_OPENCONNECTION]]
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*[[_CONNECTED]], [[_CONNECTIONADDRESS$]]
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*[[Email Demo]], [[Inter-Program Data Sharing Demo]]
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*[[Downloading Files]]
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{{PageNavigation}}
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