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Msxmlhttp sending image data
Message
 
To
25/07/2014 10:15:40
Mike Yearwood
Toronto, Ontario, Canada
General information
Forum:
Visual FoxPro
Category:
ActiveX controls in VFP
Environment versions
Visual FoxPro:
VFP 9 SP2
OS:
Windows Server 2012
Network:
Windows 2008 Server
Database:
MS SQL Server
Application:
Desktop
Miscellaneous
Thread ID:
01603736
Message ID:
01604792
Views:
50
Sorry not familiar enough with PHP and its HTTP library to parse what they're doing. IThe first block is plain configuration of the HTTP client and then a file is sent in some sort of format. It looks like raw data to me, but couldn't say for sure.

If I had to guess I'd say they are posting a raw JPG file to the server - it's not a file upload but a raw HTTP request:
Do wwHTTP

loHTTP = CREATEOBJECT("wwhttp")
loHttp.cContentType = "img/jpeg"
loHttp.AddPostKey(FILETOSTR("C:\sailbig.jpg"))
lcResponse = loHttp.HttpGet("https://api.realsatisfied.com/v1/image.json")

? lcResponse
Tried this but I get an error that says - Request JSON is invalid which seems to suggest the endpoint is expecting a JSON request. The PHP code isn't doing any of that though... I don't see any conversion to JSON from anything. Something is missing from that sample if you ask me.

Something must be missing about that PHP code because nowhere does it set the content type or assign any other POST variables that seem to suggest the data would be in JSON.

What I would do is see if you can run the PHP code then capture the HTTP trace with Fiddler. From that you can probably create the HTTP request you need to communicate with the service. Don't they have any documentation?

+++ Rick ---



>Hey Rick
>
>Can you translate this PHP curl code to vfp? I tried with libcurl, but I am not getting any success.
>
>$ch = curl_init("https://api.realsatisfied.com/v1/image.json");
>curl_setopt($ch, CURLOPT_HEADER, false);
>curl_setopt($ch, CURLOPT_USERPWD, "userid:password");
>curl_setopt($ch, CURLOPT_TIMEOUT, 30);
>curl_setopt($ch, CURLOPT_POST, true);
>$payload = array(
>"file_path"=>"@/env/david/workspace/realestatesat/public/images/td_agent_photo.jpg",
>);
>curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
>curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
>$json_return = curl_exec($ch);
>echo $json_return;
>exit();
>
>
>
>>If the data in the body is *just* raw binary data then the photo is not being sent by multipart-form. Multipart form includes mime headers for the data followed by the content and then separated by Mime boundaries.
>>
>>if they're sending raw data it's just a raw HTTP request with raw image content type (ie. Content-Type: image/jpeg).
>>
>>Just not sure how you can actually get the binary data into XmlHttp's send buffer. A COM string assignment in Send() will truncate at nulls (0 which might be present in binary data and images)...
>>
>>Verified though that binary results can now be read directly by VFP as they come back as VARTYPE() Q. Prior to the varbinary type this wasn't possible and you had to resort to ADO Streams to read the ResponseStream rather than ResponseBody.
>>
>>Either way - using XmlHttp is fraught with issues once you go beyond the basics - it's just very inconsistent in how data is accepted and read, not to mention the funky mostly undocumented attribute based customizations for extended functionality like authentication.
>>
>>+++ Rick ---
>>
>>>Hey Rick
>>>
>>>Thanks for contributing to this! I used fiddler2 to get the raw payload from the provider's own API testbed. I can see exactly what his end is expecting. Interestingly enough, the filetostr() vfp function of a jpg looks to me like the stuff in his payload.
>>>
>>>>Argh - save yourself the pain of using XmlHttp for anything but basic HTTP requests... seriously. So many issues with that and file uploads require separate Stream objects out of the ADO library.
>>>>
>>>>with wwHttp:
>>>>
>>>>
>>>>Do wwHTTP
>>>>
>>>>loHttp = CREATEOBJECT("wwHTTP")
>>>>loHttp.nHttpPostMode = 2  && multipart forms
>>>>loHttp.AddPostKey("image","c:\temp\sailbig.jpg",.T.)
>>>>loHttp.AddPostKey("notes","cool shot from the other day")
>>>>
>>>>lcResult = loHttp.HttpGet("http://somesite.com/uploadimages/")
>>>>IF (loHttp.nError != 0)
>>>>   ? loHttp.cErrorMsg
>>>>   RETURN
>>>>ENDIF
>>>>
>>>>? lcResult
>>>>
>>>>
>>>>more info here:
>>>>http://www.west-wind.com/webconnection/wwClient_docs/_0rs0twgr6.htm
>>>>
>>>>+++ Rick ---
>>>>
>>>>>Hi all
>>>>>
>>>>>I'm using msxmlhttp v 6.0 to get/post simple things. Now I've been asked to send an image. The enctype must be "multipart/form-data".
>>>>>
>>>>>o=CREATEOBJECT("Empty")
>>>>>ADDPROPERTY(m.o,"FirstName","Mike")
>>>>>ADDPROPERTY(m.o,"LastName","Yearwood")
>>>>>oJSON=CREATEOBJECT("Json")
>>>>>lcJSON = oJSON.Stringify(m.o)
>>>>>?m.lcJSON
>>>>>
>>>>>oHTTP = CREATEOBJECT("MSXML2.XMLHTTP.6.0")
>>>>>cusername="cantsay"
>>>>>cpassword="wontsay"
>>>>>cUrl="https://somewhere.com/overtherainbow"
>>>>>luResult = oHTTP.OPEN("GET", m.cURL, .F., m.cUserName, m.cPassword)
>>>>>lcEncode64=STRCONV(m.cUserName+":"+m.cPassword,13)
>>>>>oHTTP.SetRequestHeader("Authorization", "Basic "+m.lcEncode64)
>>>>>oHTTP.SetRequestHeader("Content-Type", "application/json")
>>>>>
>>>>>oHTTP.SEND()
>>>>>
>>>>>?oHTTP.Status()
>>>>>
>>>>>Where and how would I go about adding a filename and a data stream?
>>>>>
>>>>>Thanks
+++ Rick ---

West Wind Technologies
Maui, Hawaii

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