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Shahram
Joined: 13 May 2013
Posts: 25
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 Posted: Mon May 13, 2013 7:43 pm Post subject: READ_URL@ problem with proxy servers |
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| I have used the function CALL READ_URL@(URL,FILE,MODE,IERROR) to receive an ID of my client from MYSQL server. It works fine, but if my client is using Proxy this function returns internet error. Would you please guide me how I can use it with proxyservers.[url][/url] |
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PaulLaidler
Site Admin
Joined: 21 Feb 2005
Posts: 7925
Location: Salford, UK
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| Posted: Tue May 14, 2013 8:50 am Post subject: |
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read_url@ contains the following line of C code...
| Code: | session=InternetOpen("XXX",LOCAL_INTERNET_ACCESS,NULL,INTERNET_INVALID_PORT_NUMBER,
INTERNET_FLAG_DONT_CACHE); |
The third argument of InternetOpen is set to NULL so there is no provision to provide the name of the proxy server.
I could provide the C code for the whole of the routine if you would like to adapt it to your needs. Alternatively I may be able to add a new routine if you can do the testing. |
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Shahram
Joined: 13 May 2013
Posts: 25
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| Posted: Tue May 14, 2013 2:22 pm Post subject: |
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Thank you for the quick response. Please select one of the way that you suggested me.
You can also send me the C code. Please let me know what I need to do with that in order it to work for all my clients. I will try to see the result. If I do not succeed with that, I will ask you to include the code in the URL code.
Sincerely
Prof. Shahram Montaser Kouhsari
smk@intelectri.com |
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PaulLaidler
Site Admin
Joined: 21 Feb 2005
Posts: 7925
Location: Salford, UK
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| Posted: Tue May 14, 2013 3:53 pm Post subject: |
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Here is some code based on the implementation of read_url@...
| Code: | extern "C" void __read_url(char* from, char* output, int mode, int& error)
{
HINTERNET session,rh;
FILE* f;
char buffer[8192];
unsigned long nn;
char* fom = "w";
if(mode) fom = "wb";
error = 1;
session = InternetOpen("XXX", LOCAL_INTERNET_ACCESS, NULL, INTERNET_INVALID_PORT_NUMBER,
INTERNET_FLAG_DONT_CACHE);
if(!session) return;
rh = InternetOpenUrl(session, from, NULL, 0xffffffff, 0x04000000, 42);
if(!rh) goto fin3;
f = fopen(output,fom);
if(!f) goto fin2;
while(1)
{
if(!InternetReadFile(rh,buffer,8192,&nn)) goto fin1;
if(nn == 0) break;
fwrite(buffer,nn,1,f);
}
error = 0;
fin1:
fclose(f);
fin2:
InternetCloseHandle(rh);
fin3:
InternetCloseHandle(session);
}
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dgurok
Joined: 26 May 2011
Posts: 66
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| Posted: Wed Oct 21, 2015 9:58 am Post subject: |
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Hi Paul,
do I can compile your C code with SCC ? I'm interested in this solution because I need somehow access to the internet via proxy.
I have problems to resolve some symbols using SCC.. (e.g. InternetReadFile, HINTERNET) |
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PaulLaidler
Site Admin
Joined: 21 Feb 2005
Posts: 7925
Location: Salford, UK
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| Posted: Wed Oct 21, 2015 11:50 am Post subject: |
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The following code compiles using SCC...
| Code: | #include <stdio.h>
typedef void* LPVOID;
typedef void* HINTERNET;
typedef const char* LPCSTR;
typedef unsigned int DWORD;
typedef int BOOL;
#define InternetOpen InternetOpenA
#define InternetOpenUrl InternetOpenUrlA
#define LOCAL_INTERNET_ACCESS 1
#define INTERNET_INVALID_PORT_NUMBER 0
#define INTERNET_FLAG_DONT_CACHE 0x04000000
HINTERNET __stdcall InternetOpenA(LPCSTR lpszAgent, DWORD dwAccessType, LPCSTR lpszProxy, LPCSTR lpszProxyBypass, DWORD dwFlags);
HINTERNET __stdcall InternetOpenUrlA(HINTERNET hInternet, LPCSTR lpszUrl, LPCSTR lpszHeaders, DWORD dwHeadersLength, DWORD dwFlags, DWORD dwContext);
BOOL __stdcall InternetReadFile(HINTERNET hFile, LPVOID lpBuffer, DWORD dwNumberOfBytesToRead, DWORD* lpdwNumberOfBytesRead);
BOOL __stdcall InternetCloseHandle(HINTERNET hInternet);
extern "C" void __read_url(char* from, char* output, int mode, int& error)
{
HINTERNET session,rh;
FILE* f;
char buffer[8192];
unsigned int nn;
char* fom = "w";
if(mode) fom = "wb";
error = 1;
session = InternetOpen("XXX", LOCAL_INTERNET_ACCESS, NULL, INTERNET_INVALID_PORT_NUMBER,
INTERNET_FLAG_DONT_CACHE);
if(!session) return;
rh = InternetOpenUrl(session, from, NULL, 0xffffffff, 0x04000000, 42);
if(!rh) goto fin3;
f = fopen(output,fom);
if(!f) goto fin2;
while(1)
{
if(!InternetReadFile(rh,buffer,8192,&nn)) goto fin1;
if(nn == 0) break;
fwrite(buffer,nn,1,f);
}
error = 0;
fin1:
fclose(f);
fin2:
InternetCloseHandle(rh);
fin3:
InternetCloseHandle(session);
} |
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dgurok
Joined: 26 May 2011
Posts: 66
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| Posted: Thu Oct 22, 2015 9:25 am Post subject: |
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Thx Paul for the Code. The compile works but during the link process I get a warning: WARNING the following symbols are missing:
InternetOpenA
InternetOpenUrlA
InternetReadFile
InternetCloseHandle
Do I have link against something...? |
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PaulLaidler
Site Admin
Joined: 21 Feb 2005
Posts: 7925
Location: Salford, UK
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| Posted: Thu Oct 22, 2015 6:19 pm Post subject: |
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| Yes, you will need to load Wininet.dll when linking. |
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dgurok
Joined: 26 May 2011
Posts: 66
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| Posted: Fri Oct 23, 2015 11:52 am Post subject: |
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| Thx Paul, everything is working fine for me now. |
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