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Internetreadfile Error 6

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business internetopenurl msdn Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation internetwritefile Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like httpqueryinfo you, helping each other. Join them; it only takes a minute: Sign up Correct way to use InternetReadFile() asynchronously up vote 3 down vote favorite 1 I've got code that's performing HTTP requests using WinInet API's asynchronously.

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In general, my code works, but I'm confused about the 'right' way to do things. In the documentation for InternetReadFile(), it states: To ensure all data is retrieved, an application must continue to call the InternetReadFile function until the function returns TRUE and the lpdwNumberOfBytesRead parameter equals zero. but in asynchronous mode, it may (or may not) return false, and an error of ERROR_IO_PENDING, indicating it'll do the work asynchronously, and call my callback when finished. httpsendrequest If I read the documentation literally, it seems that the asynchronous calls could also just do a partial read of the requested buffer, and require the caller to keep calling InternetReadFile until a read of 0 bytes is encountered. A typical implementation using InternetReadFile() synchronously would look something like this: while(InternetReadFile(Request, Buffer, BufferSize, &BytesRead) && BytesRead != 0) { // do something with Buffer } but with the possibility that any one call to InternetReadFile() could signal that it's going to do the work asynchronously (and perhaps read part, but not all of your request), it becomes much more complicated. If I turn to MSDN sample code for guidance, the implementation is simple, simply calling InternetReadFile() once, and expecting a single return having read the entire requested buffer either instantly or asynchronously. Is this the correct way to use this function, or is MSDN Sample Code ignoring the possibility that InternetReadFile() will only read part of the requested buffer? wininet share|improve this question asked Apr 1 '13 at 17:18 Jon Brooks 750722 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote accepted After a more careful reading of the asynchronous example, I see now that it is reading repeatedly until a successful read of 0 bytes is encountered. So to answer my own question, you must call InternetReadFile() ov

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programmers, just like you, helping each other. Join them; it only takes a minute: Sign up InternetReadFile Problem (error 87 - The parameter is incorrect) up vote 0 down vote favorite I have a problem here http://stackoverflow.com/questions/15748092/correct-way-to-use-internetreadfile-asynchronously with InternetReadFile, if I run the application in a computer without proxy, the app runs ok, but if I try to use with a computer using proxy, I receive an error 87 (The parameter is incorrect). Thats my code: conHandle = InternetOpen("Test", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); ... hFile = InternetOpenUrl(conHandle, url.c_str(), NULL, 0, INTERNET_FLAG_RELOAD, 0); ... if (!InternetReadFile(hFile, buffer, maxBufferSize, &size)) { // error } And I also tried to use: InternetOpen("Test", INTERNET_OPEN_TYPE_PROXY, "proxystr", http://stackoverflow.com/questions/521922/internetreadfile-problem-error-87-the-parameter-is-incorrect NULL, 0); but without success too. Anyone knows anything about what Im doing wrong? thankz, erick c++ winapi wininet share|improve this question asked Feb 6 '09 at 19:56 Erick add a comment| 2 Answers 2 active oldest votes up vote 1 down vote You need to keep calling InternetReadFile in a loop until it returns TRUE and the number of bytes read is 0. This usually means at least 2 calls to InternetReadFile. while ( InternetReadFile( hFile, buffer, maxBufferSize, &size ) == FALSE || size > 0 ) { // process buffer contents. // for ex: write the contents of buffer to a temp file for example. } share|improve this answer answered Aug 17 '09 at 10:18 Srikumar 36116 add a comment| Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Subscribed! Success! Please click the link in the confirmation email to activate your subscription. up vote 0 down vote It should be: while (InternetReadFile(hFile, buffer, maxBufferSize, &size) == TRUE || size > 0) { // process buffer contents. // for ex: write the contents of buffer to a temp file for example. } share|improve this answer edited Sep 25 '11 at 0:19 LPL 12.1k42149 answered Oct 1 '09 at

3 Replies | 0 Followers edesilva Alexandria, VA Since 3/29/2003 Posts 3 Reputation http://vbcity.com/forums/t/22770.aspx 30 Reply Eric DeSilva (edesilva) Posted: 3/29/2003 11:22 PM rated by 0 users Usual disclaimers--I'm new to VB, new to .NET, etc. Last time I spent any time programming, C didn't have "++" or "#" appended to it. Anyway, I'm trying to write an app to interact with a .asp (Audiotron) on a internetreadfile error local network. After poking around on the internet for wininet info, this is what I cobbled together just to try and get familiar with the wininet stuff. Needless to say, it doesn't work--keeps bombing out when it does the InternetReadFile, giving me an error code of "6", which seems to mean an invalid handle. internetreadfile error 6 I've been wondering if its the sBuffer--all the examples in VB6 seem to use something like "dim sBuffer As String * 4096", but that construct doesn't seem to exist in VB.NET. Any ideas?Code:Option Explicit On Public Class Form1Inherits System.Windows.Forms.FormPrivate hInternetSession As LongPrivate hInternetOpenURL As Long' wininet stuffPublic Const UserAgent = "http test"Public Const INTERNET_OPEN_TYPE_PRECONFIG = 0' Number of the TCP/IP port on the server to connect to.Public Const INTERNET_DEFAULT_HTTP_PORT = 80Public Const INTERNET_FLAG_EXISTING_CONNECT = &H20000000'#Region " Windows Form Designer generated code " left out' Opens an Internet SessionPublic Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" _(ByVal sAgent As String, ByVal lAccessType As Long, ByVal sProxyName As String, _ByVal sProxyBypass As String, ByVal lFlags As Long) As Long' Opens an Internet URLPublic Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" _(ByVal hInternetSession As Long, ByVal sUrl As String, ByVal sHeaders As String, _ByVal lHeadersLength As Long, ByVal lFlags As Long, ByVal lContext As Long) As Long' Reads data from a handle o

 

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internetreadfile error

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