ATL / WTL / STL

<br />
CString strStaus;<br />
	//step1<br />
	CInternetSession Session(_T("Test Application"));<br />
	//step2<br />
	CHttpConnection Connection1(Session,_T("http://10.5.1.4/downloads/Managepoint/ManagePoint431InstallerBuild_55.zip") ) ;<br />
	//step 3<br />
	BYTE Buffer[4096];<br />
<br />
	//CHttpFile File1(Connection1,_T("GET"),_T("/"));<br />
	//File1.SendRequest();<br />
	//for (DWORD dwRead1;dwRead1=File1.Read(Buffer,sizeof(Buffer)) ; ) ;<br />
	<br />
	CHttpFile File2(Session,_T("http://10.5.1.4/downloads/Managepoint/ManagePoint431InstallerBuild_55.zip") ) ;<br />
	for (DWORD dwRead2;dwRead2=File2.Read(Buffer,sizeof(Buffer)) ; ) <br />
	{<br />
		// Info.GetTimeLeft() = Seconds left for download<br />
	}<br />

CHttpFile File1(Connection1,_T("GET"),_T("/"));
File1.SendRequest();
ULONGLONG const nBytes = </code><code>File1.GetLength();</code>
<code>BYTE* bytes = new BYTE[</code><code>nBytes</code><code>];
File1.Read(bytes ,</code><code>nBytes</code><code>) ;
HANDLE hFile = CreateFile(some-file-name, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, 0, 0);
DWORD bytesWritten;
WriteFile(hFile, bytes, (DWORD)nBytes, &bytesWritten, 0);
CloseHandle(hFile);

<br />
    for (DWORD dwRead2;dwRead2=File2.Read(Buffer,sizeof(Buffer));)//);<br />
{<br />
     fwrite(Buffer, sizeof (char), dwRead2 , pFile);    <br />
}<br />

<br />
std::string strTmpFileName = "Temp_OutlookAddinInstallerBuild_30.zip";<br />
	std::string strFileNameAtLocalMachine= "OutlookAddinInstallerBuild_30.zip";<br />
<br />
	CString strStaus;<br />
	double dCurrentFileSize;<br />
<br />
	DWORD dwBytesWrrittenToFile =0;<br />
<br />
	if(IfLocalFileExist(strTmpFileName.c_str(), &dCurrentFileSize)) <br />
	{<br />
		dOffsetToSeek				= dCurrentFileSize;<br />
	}<br />
	<br />
	CString strRangeQuest;<br />
<br />
	if(dCurrentFileSize>0){   <br />
	strRangeQuest.Format( _T("%sRange: bytes=%d-\r\n"), szHeaders,static_cast<ULONGLONG>(dCurrentFileSize));<br />
	}<br />
	else        <br />
	strRangeQuest = szHeaders;<br />
<br />
	dwBytesWrrittenToFile = dOffsetToSeek;<br />
<br />
	 if  ( !(pFile = fopen (strTmpFileName.c_str(), "ab" ) ) )<br />
	   {<br />
			CString strMsg;<br />
			strMsg.Format("Error:%d", GetLastError());<br />
			return false;<br />
	   }<br />
	 if(dOffsetToSeek >=0)<br />
	   {<br />
			strStaus.Format("Seeking to local file...");<br />
			int n = fseek(pFile, dOffsetToSeek, SEEK_SET);<br />
	   }<br />
<br />
	//step1<br />
	CInternetSession Session(_T("Test Application"));<br />
	//step2<br />
	CHttpConnection Connection1(Session,_T("http://10.5.1.4/downloads/OutlookAddin/OutlookAddinInstallerBuild_30.zip"));<br />
	//step 3<br />
	BYTE Buffer[4096];<br />
<br />
	CHttpFile File2(Session,_T("http://10.5.1.4/downloads/OutlookAddin/OutlookAddinInstallerBuild_30.zip"));<br />
	CInternetFile::CInfo Info(File2);<br />
	File2.SendRequest(strRangeQuest);<br />
	int FileSize = Info.GetTotalDataLength();<br />
	<br />
	if (FileSize == dCurrentFileSize)<br />
	{<br />
	return 0;<br />
	}<br />
<br />
	for (DWORD dwRead2;dwRead2=File2.Read(Buffer,sizeof(Buffer));)<br />
	{<br />
		 fwrite(Buffer, sizeof (char), dwRead2 , pFile);	<br />
	}<br />
<br />
		MoveFile(strTmpFileName.c_str(), strFileNameAtLocalMachine.c_str() );<br />
<br />
	return 0;<br />

monsieur_jj wrote:

How can I prevent the re-download of the file if it is already successfilly downloaded because the problem is that after i successfully downloaded the file and restarted my program it downloads again and adds the files to the complete files thus doubling the size of the file and making the file useless.

<br />
BYTE Buffer[4096];<br />
<br />
CHttpFile File1(Connection1,_T("GET"),_T("/"));<br />
File1.SendRequest();<br />
for (DWORD dwRead1;dwRead1=File1.Read(Buffer,sizeof(Buffer)););<br />
<br />
CHttpFile File2(Session,_T("http://www.codeproject.com/"));<br />
for (DWORD dwRead2;dwRead2=File2.Read(Buffer,sizeof(Buffer)););<br />

#include <Windows.h>
#include <ShlWApi.h>

// Load the resource specified by ('hmodResource', 'name', 'type') and write it to 'destination'.
// 'type' may be zero, in which case we deduce it from the resource name.
bool WriteFileFromResource(HINSTANCE hmodResource, LPCTSTR name, LPCTSTR type, LPCTSTR destination)
{
   if (!type)
      type = ::PathFindExtension(name) + 1;
   HRSRC rsrcFile = ::FindResource(hmodResource, name, type);
   if (!rsrcFile) false;
   HGLOBAL gblFile = ::LoadResource(hmodResource, rsrcFile);
   if (!gblFile) false;
   DWORD sizeFile = ::SizeofResource(hmodResource, rsrcFile);
   if (!sizeFile) return false;
   LPVOID filePointer = ::LockResource(gblFile);
   if (filePointer)
   {
     bool ret = false;
      HANDLE hFile = ::CreateFile(destination, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, 0, 0);
      if (hFile)
      {
        DWORD nBytesWritten;
        ret = (::WriteFile(hFile, filePointer, (DWORD)sizeFile, &nBytesWritten, 0) && sizeFile == nBytesWritten);
        ::CloseHandle(hFile);
      }
      ::FreeResource(gblFile);
      return ret;
   }
   return false;
}

hari_honey wrote:

I got some code which will make use of CreateFile and read data from it.
But i dont know exactl where can use the code what will be the function return type because i am developing a ATL dll.
So i am unable to procede further.