Anders/Besser geht es nicht?

Danke

Bei mir kommt etwas gaaanz anderes heraus, als die Größe der Datei

MSDN schrieb:

Let's say that we want to get the size of the HTML page before downloading it so that we can allocate a buffer in the exact size. HttpQueryInfo will get the size of the Web page.

A word of caution: Not all Web pages support getting the page size. (For example, www.toystory.com and www.movielink.com don't support this functionality.) Also, TCP/IP can send less data than requested. Therefore, your application should handle both of these cases and loop around InternetReadFile until the result is True and *lpdwNumberOfBytesRead is 0.

The code to open the file http://www.microsoft.com/msdn/msdninfo/ using HttpOpenRequest, HttpSendRequest, and HttpQueryInfo is shown below. The error checking has been removed.

// Open Internet session.
HINTERNET hSession = ::InternetOpen("MSDN SurfBear",
                                    PRE_CONFIG_INTERNET_ACCESS,
                                    NULL, 
                                    INTERNET_INVALID_PORT_NUMBER,
                                    0) ;

// Connect to www.microsoft.com.
HINTERNET hConnect = ::InternetConnect(hSession,
                                    "www.microsoft.com",
                                    INTERNET_INVALID_PORT_NUMBER,
                                    "",
                                    "",
                                    INTERNET_SERVICE_HTTP,
                                    0,
                                    0) ;

// Request the file /MSDN/MSDNINFO/ from the server.
HINTERNET hHttpFile = ::HttpOpenRequest(hConnect,
                                     "GET",
                                     "/MSDN/MSDNINFO/",
                                     HTTP_VERSION,
                                     NULL,
                                     0,
                                     INTERNET_FLAG_DONT_CACHE,
                                     0) ;

// Send the request.
BOOL bSendRequest = ::HttpSendRequest(hHttpFile, NULL, 0, 0, 0);

// Get the length of the file.            
char bufQuery[32] ;
DWORD dwLengthBufQuery = sizeof(bufQuery);
BOOL bQuery = ::HttpQueryInfo(hHttpFile,
                              HTTP_QUERY_CONTENT_LENGTH, 
                              bufQuery, 
                              &dwLengthBufQuery) ;

// Convert length from ASCII string to a DWORD.
DWORD dwFileSize = (DWORD)atol(bufQuery) ;

// Allocate a buffer for the file.   
char* buffer = new char[dwFileSize+1] ;

// Read the file into the buffer. 
DWORD dwBytesRead ;
BOOL bRead = ::InternetReadFile(hHttpFile,
                                buffer,
                                dwFileSize+1, 
                                &dwBytesRead);
// Put a zero on the end of the buffer.
buffer[dwBytesRead] = 0 ;

// Close all of the Internet handles.
::InternetCloseHandle(hHttpFile); 
::InternetCloseHandle(hConnect) ;
::InternetCloseHandle(hSession) ;

// Display the file in an edit control.
pEditCtrl->SetWindowText(buffer) ;