您如何在LabWindows CVI中从网站阅读文本？

Question

I'm trying to read a simple text string from a website into my LabWindows CVI program. I've looked everywhere but can't find an example of using a simple HTTP GET request.

Does anyone know if this can be accomplished in LabWindows?

Here's the website text I'm trying to read: http://www.swpc.noaa.gov/ftpdir/latest/wwv.txt

Answer 1

I have a similar application. This is my code where "WEBserviceLink" is the URL. All data is stored in "buffer" variable.

HTTPh = InternetOpenUrl (Ih, WebServiceLink, NULL, 0, INTERNET_FLAG_KEEP_CONNECTION, context);
if (!HTTPh) {
    line = __LINE__;
    error = GetLastError ();
    result = -1;
    goto Error;
}

if (!InternetQueryDataAvailable (HTTPh, &bytesRead, 0, 0)) {
    line = __LINE__;
    error = GetLastError ();
    result = -1;
    goto Error;
}

buffer = malloc (bytesRead + 3);
memset (buffer, 0, bytesRead + 3);


if (!InternetReadFile (HTTPh, buffer, bytesRead + 1, &bytesRead)) {
    line = __LINE__;
    error = GetLastError ();
    result = -1;
    goto Error;
}

Answer 2

Got it. LabWindows allows this kind of functionality through Telnet services.

First you do a "InetTelnetOpen" to open the connection.
Then you do "InetTelnetWrite" and write the "GET ..." message.
Then you do "InetTelnetReadUntil" and read until the string "/html>" to get all the site's text.

LabWindows truly is an awful, poorly documented language.