http download

[huricane]

I am new to C++ and I need help with downloading a file from a webserver unto the local machine

Steps

1. first I need to connect to an asp page passing the machine IP as an argument eg

http://webserver/GetFile.asp?IP=192.0.0.1

2. In response the asp page will return the path to the file to download this page is already done
3. The C++ application then proceeds to download the file unto the local machine
4. After downloading it proceeds to load the a VB.exe application

Any help will be appreciated

 

[qednick]

Hello Hurricane,

Here's some code that'll download a file from a given url and save it to local hard disk. You'll need to #include the approriate header files.

[tt]
unsigned char buffer[512];
int bytes = 1;
int totalRead = 0;
CString fileName = "";
CString query = "";
CString

url = "[URL unfurl="true"]http://some_url.com";[/URL]

CHttpFile* file = NULL;
CInternetSession* inetSession = NULL;

try{

inetSession = new CInternetSession("AppName",1,
INTERNET_OPEN_TYPE_DIRECT,NULL,NULL,0);

file = (CHttpFile*)inetSession->OpenURL(LPCTSTR(url),
1,INTERNET_FLAG_TRANSFER_BINARY|INTERNET_FLAG_RELOAD);

// get size of remote file
file->QueryInfo(HTTP_QUERY_CONTENT_LENGTH,query);

fileName = file->GetFileURL();
fileName.Delete(0,fileName.ReverseFind('/')+1);


}
catch(CInternetException* e) {
e->ReportError();
e->Delete();
// abort here!
}
catch(CFileException* e) {
e->ReportError();
e->Delete();
// abort here!
}

FILE* f = fopen(LPCTSTR(fileName),"wb+"
while(bytes>0 && totalRead<atol(query))
{
bytes = file->Read(buffer,512);
fwrite(buffer,bytes,1,f);
totalRead+=bytes;
}
fflush(f);
fclose(f);
file->Close();
[/tt]

[sup]programmer (prog'ram'er), n A hot-headed, anorak wearing, pimple-faced computer geek.[/sup]​

 

[huricane]

thanks I will try this

 

[qednick]

Hello again Hurricane, something I forgot to include but assumed you'd know it - don't forget to 'delete' the CInternetSession object [tt]inetSession[/tt] once you're finished with it:

[tt]delete inetSession;[/tt]

to avoid a memory leak!

The headers you need to include are:

[tt]#include <afxinet.h>[/tt]

You obviously swap the values of the URL and &quot;AppName&quot; strings for whatever values you see fit. (The AppName is the string that is passed to the URL as the ENV value HTTP_USER_AGENT - or whatever it is!).

If you put this code in a separate thread, you can implement a progress bar or whatever within the file-writing loop to show the user the progress of download. Simply set the progress bar's range from 0 to atol(query) and then move the position of the bar according to the number of bytes read! Works real cool!!

Sorry I ommitted this extra info earlier - I was in a rush and had to leave!!

[sup]programmer (prog'ram'er), n A hot-headed, anorak wearing, pimple-faced computer geek.[/sup]​

 

[huricane]

Thanks again qednick much appreciated