WinInet Question
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  1. #1
    Join Date
    Nov 2008
    Location
    Cebu, Philippines
    Posts
    19

    Question WinInet Question

    Hello All. Can anyone of you tell me why this piece of code doesn't work? the call to HttpOpenRequest() returns an 87 error code which is an invalid parameter ( returned by GetLastError() ) and i don't know what's causing it. please help.. thank you in advance.

    Code:
    #include "stdafx.h"
    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <windows.h>
    #include <wininet.h>
    #include <strsafe.h>
    #pragma comment (lib, "wininet.lib")
    
    
    void ErrorExit(LPTSTR lpszFunction) 
    { 
        // Retrieve the system error message for the last-error code
    
        LPVOID lpMsgBuf;
        LPVOID lpDisplayBuf;
        DWORD dw = GetLastError(); 
    
        FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER | 
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dw,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPTSTR) &lpMsgBuf,
            0, NULL );
    
        // Display the error message and exit the process
    
        lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, 
            (lstrlen((LPCTSTR)lpMsgBuf) + lstrlen((LPCTSTR)lpszFunction) + 40) * sizeof(TCHAR)); 
        StringCchPrintf((LPTSTR)lpDisplayBuf, 
            LocalSize(lpDisplayBuf) / sizeof(TCHAR),
            TEXT("%s failed with error %d: %s"), 
            lpszFunction, dw, lpMsgBuf); 
        MessageBox(NULL, (LPCWSTR)lpDisplayBuf, TEXT("Error"), MB_OK); 
        
        LocalFree(lpMsgBuf);
        LocalFree(lpDisplayBuf);
        ExitProcess(dw); 
    }
    
    int Dumper(HINTERNET hResource)
    {
        LPTSTR  lpszData;    // buffer for the data
        DWORD  dwSize;       // size of the data available
        DWORD  dwDownloaded; // size of the downloaded data
        DWORD  dwSizeSum=0;  // size of the data in the textbox
        LPTSTR lpszHolding;  // buffer to merge the textbox data and buffer
        LPTSTR textbox;
        size_t size;
        // This loop handles reading the data.  
        do
        {
            // The call to InternetQueryDataAvailable determines the
                  // amount of data available to download.
            if (!InternetQueryDataAvailable(hResource,&dwSize,0,0))
            {
                printf("InternetQueryDataAvailable Error\n");
                return FALSE;
            }
            else
            {    
                    // Allocate a buffer of the size returned by
                // InternetQueryDataAvailable.
                lpszData = new TCHAR[dwSize+1];
    
                // Read the data from the HINTERNET handle.
                if(!InternetReadFile(hResource,
                                     (LPVOID)lpszData,
                                     dwSize,
                                     &dwDownloaded))
                {
                    printf("InternetReadFile\n");
                    delete[] lpszData;
                    break;
                }
                else
                {
                    // Add a null terminator to the end of the data buffer
                    lpszData[dwDownloaded]='\0';
    
                    // Allocate the holding buffer.
                    lpszHolding = new TCHAR[dwSizeSum + dwDownloaded + 1];
                        
                    // Check if there has been any data written 
                    // to the textbox.
                    if (dwSizeSum != 0)
                    {
                        lpszHolding = textbox;
                             
                        // Add a null terminator at the end of the 
                        // textbox data.
                        lpszHolding[dwSizeSum]='\0';
                    }
                    else
                    {
                        // Make the holding buffer an empty string. 
                        lpszHolding[0]='\0';
                    }
                        
                    size_t cchDest = dwSizeSum + dwDownloaded + 
                              dwDownloaded + 1;
                    LPTSTR* ppszDestEnd;
                    size_t* pcchRemaining;
    
                    // Add the new data to the holding buffer
                    HRESULT hr = StringCchCatEx(lpszHolding, 
                                                cchDest, 
                                                lpszData,
                                                ppszDestEnd, 
                                                pcchRemaining, 
                                                STRSAFE_NO_TRUNCATION);
                
                    if(SUCCEEDED(hr))
                    {
                      // Write the holding buffer to the textbox.
                      StringCchLength(lpszHolding,STRSAFE_MAX_CCH, &size );
                      StringCchCopy(textbox, size, lpszHolding );
    
                      // Delete the two buffers.
                      delete[] lpszHolding;
                      delete[] lpszData;
    
                     // Add the size of the downloaded data to the 
                     // textbox data size.
                     dwSizeSum = dwSizeSum + dwDownloaded + 1;
    
                     // Check the size of the remaining data.  
                     // If it is zero, break.
                    if (dwDownloaded == 0)
                        break;
                    }
                    else
                    {
                    //  TODO: Insert error handling code here.
                    }
                }  
            }        
        }while(TRUE);
    
         // Close the HINTERNET handle.
         InternetCloseHandle(hResource);
         printf("%s",textbox);
         // Return
         return TRUE;
    }
    
    
    int _tmain(int argc, _TCHAR* argv[])
    {
        HINTERNET hOpen;
        HINTERNET hConnect;
        HINTERNET hRequest;
        LPCWSTR ax = (LPCWSTR)"/index.php";
        LPCWSTR bx = (LPCWSTR)"";
        LPCWSTR httpVerb = (LPCWSTR)"GET" ;
        const char* lplpszAcceptTypes[] = {"text/*", NULL};
        
        hOpen = InternetOpen((LPCTSTR)"KimHttpGet", 
                             INTERNET_OPEN_TYPE_DIRECT,
                             NULL,
                             NULL, 
                             0 );  
        if ( NULL != hOpen )
        {
            hConnect = InternetConnect( hOpen, 
                                        (LPCWSTR)"www", 
                                        INTERNET_DEFAULT_HTTP_PORT, 
                                        NULL, 
                                        NULL,
                                        INTERNET_SERVICE_HTTP, 
                                        0, 
                                        0 );
    
            if ( NULL != hConnect )
            {
                hRequest = HttpOpenRequest( hConnect, //handle returned by InternetConnect 
                                            httpVerb, // POST or GET
                                            ax, // file/object to get
                                            HTTP_VERSION,  // http version
                                            NULL,  //
                                            (LPCWSTR*)lplpszAcceptTypes, //
                                            INTERNET_FLAG_DONT_CACHE, // flags
                                            1); 
    
                if ( NULL != hRequest )
                {
                    if ( !HttpSendRequest( hRequest, NULL,0, NULL,0 ) )
                    {
                        Dumper(hRequest);
                    }
                    else
                    {
                        printf("HttpSendRequest Error\n");
                        ErrorExit((LPTSTR)"HttpSendRequest");
                    }
                }
                else
                {
                    printf("HttpOpenRequest Error\n");
                    ErrorExit((LPTSTR)"HttpOpenRequest");
                }
                
            
            }
            else
            {
                printf("InternetConnect Error\n");
                ErrorExit((LPTSTR)"InternetConnect");
            }
            
        }
        else 
        {
            printf("InternetOpen Error\n");
            ErrorExit((LPTSTR)"InternetOpen");
        }
        
    
        
          return 0;
    }

  2. #2
    Join Date
    Sep 2005
    Location
    London
    Posts
    208

    Re: WinInet Question

    Quote Originally Posted by klambiguit View Post
    Hello All. Can anyone of you tell me why this piece of code doesn't work?
    Hi klambiguit,

    You need to replace:
    Code:
    HINTERNET hOpen;
    HINTERNET hConnect;
    HINTERNET hRequest;
    LPCWSTR ax = (LPCWSTR)"/index.php";
    LPCWSTR bx = (LPCWSTR)"";
    LPCWSTR httpVerb = (LPCWSTR)"GET" ;
    With
    Code:
    HINTERNET hOpen = NULL;
    HINTERNET hConnect = NULL;
    HINTERNET hRequest = NULL;
    LPCWSTR ax = L"/index.php";
    LPCWSTR bx = L"";
    LPCWSTR httpVerb = L"GET" ;
    And
    Code:
    LPTSTR* ppszDestEnd;
    size_t* pcchRemaining;
    LPTSTR  lpszData;    // buffer for the data
    LPTSTR lpszHolding;  // buffer to merge the textbox data and buffer
    LPTSTR textbox;
    With
    Code:
    LPTSTR* ppszDestEnd = NULL;
    size_t* pcchRemaining = NULL;
    LPTSTR  lpszData = NULL;    // buffer for the data
    LPTSTR lpszHolding = NULL;  // buffer to merge the textbox data and buffer
    LPTSTR textbox = NULL;

    That should do it.


    Regards
    Doron Moraz

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