[Undocumented Evil] Download Manager API crashes and timeouts

[Dexterp37]

Hi!

I was trying to add Download Manager support in my software, and instead of writing all by myself using the RHttp family classes, I thought to use Download Manager API to simplify my life.

But it is undocumented and there are no examples at all :|

I've almost managed to get it work, but I still have some problems (once I get it working, i'll link to my source code).

That's how I initiate a download:

LBool SymbianCore::RequestResource(const String *pURL, const String *pLocalDest)
{
	if(!pURL || pURL->IsEmpty() || !pLocalDest || pLocalDest->IsEmpty())
		return LFalse;

	if(!m_bIsOnline)
	{
		GetFavouriteIap();

		m_rDownloadMgr.ConnectL(KUidLESSA, *this, ETrue );
		m_rDownloadMgr.SetIntAttribute(EDlMgrIap, m_uIapID );				        m_rDownloadMgr.SetIntAttribute(EDlMgrExitAction, EExitPause);
		m_rDownloadMgr.DeleteAll();

		m_bIsOnline = LTrue;
	}

	// Convert string to TDesC8
	TBool bResult = LFalse;
	PDO::BaseString::SymbianCore *pSymURL = (PDO::BaseString::SymbianCore *)pURL;
	HBufC8* buf8Bit = HBufC8::NewLC( pURL->Length() );
	buf8Bit->Des().Copy( *(pSymURL->GetRawData()) );

	// Add download to download manager..
	RHttpDownload& download = m_rDownloadMgr.CreateDownloadL( *buf8Bit , bResult );
	PDO::BaseString::SymbianCore *pSymDest = (PDO::BaseString::SymbianCore *)pLocalDest;
	download.SetStringAttribute(EDlAttrDestFilename, *(pSymDest->GetRawData()));
	download.SetIntAttribute(EDlAttrAction, EMove);

	download.Start();

	CleanupStack::PopAndDestroy( buf8Bit );

	return bResult;
}

In the event handler member ( HandleDMgrEventL ), that's what happens (in order):

EHttpDlCreated
EHttpDlInprogress
EHttpDlInprogress
EHttpDlInprogress
EHttpDlInprogress
EHttpDlInprogress
EHttpDlFailed

Last event is handled like that:

TInt32 iVal = 0L;	// Returns 6, EDlAttrGlobalErrorId
aDownload.GetIntAttribute(EDlAttrErrorId, iVal);

TInt32 iGenVal = 0L;	// Returns -33, KErrTimedOut 
aDownload.GetIntAttribute(EDlAttrGlobalErrorId, iGenVal);

So, what's wrong? I just handle EHttpDlFailed in the event handler...

Thanks in advance!

PS: If I don't call DeleteAll(), it crashes giving DMEngine -39 Panic!

[Dexterp37]

Examining with ethereal my packet dump, I noticed that my app request is this:

HEAD http://www.giuseppenapolitano.it/files/nulla2.jpg HTTP/1.1

Host: www.giuseppenapolitano.it

Accept: multipart/mixed, application/java-archive, application/java, application/x-java-archive, text/vnd.sun.j2me.app-descriptor, application/vnd.oma.drm.message, application/vnd.oma.drm.content, application/vnd.wap.mms-message, text/x-co/desc, application/vnd.oma.dd+xml, text/javascript, text/javascript, application/x-javascript, text/ecmascript, */*

User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Series60/2.8 Nokia6630/4.06.0 Profile/MIDP-2.0 Configuration/CLDC-1.1)

x-wap-profile: "http://nds1.nds.nokia.com/uaprof/N6630r100.xml"

While built-in emulator browser does:

GET http://www.giuseppenapolitano.it/files/nulla2.jpg HTTP/1.1Host: www.giuseppenapolitano.itAccept: multipart/mixed, application/java-archive, application/java, application/x-java-archive, text/vnd.sun.j2me.app-descriptor, application/vnd.oma.drm.message, application/vnd.oma.drm.content, application/vnd.wap.mms-message, text/x-co/desc, application/vnd.oma.dd+xml, text/javascript, text/javascript, application/x-javascript, text/ecmascript, */*Range: bytes=2629-User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Series60/2.8 Nokia6630/4.06.0 Profile/MIDP-2.0 Configuration/CLDC-1.1)x-wap-profile: "http://nds1.nds.nokia.com/uaprof/N6630r100.xml"HTTP/1.1 206 Partial ContentContent-Length: 141812Content-Type: image/jpegContent-Range: bytes 2629-144440/144441Last-Modified: Sun, 21 Nov 2004 13:09:43 GMTAccept-Ranges: bytesETag: "765bb55dcbcfc41:33e6f9"Server: Microsoft-IIS/6.0MicrosoftOfficeWebServer: 5.0_PubX-Powered-By: ASP.NETDate: Wed, 12 Jul 2006 14:10:32 GMT

Why do download manager make transaction using HEAD instead of GET?

[Dexterp37]

I made it work! You can find a working example of it here, in the SVN repository (Symbianns2Core.cpp and .h file)

[sachin@symbian]

Hi Dexterp37,

I think the code posted by you on LESSA is no longer available. Can you please do a re-post?

thanx
Sachin

[Dexterp37]

Hi Dexterp37,

I think the code posted by you on LESSA is no longer available. Can you please do a re-post?

thanx
Sachin

Hi!

My code is still available in Sourceforge's SVN repository. You can reach it from the project page:

http://sourceforge.net/projects/lessa

Hope it helps,

[kdurga]

Hi Dexterp37,
kindly mail me your code... I am facing similar issue. It was working fine then all of a sudden it started panicing by giving "DownloadMgrServer.exe::!DownloadMgrServer Panic DMEngine -39" this.

[Dexterp37]

Hi Dexterp37,
kindly mail me your code... I am facing similar issue. It was working fine then all of a sudden it started panicing by giving "DownloadMgrServer.exe::!DownloadMgrServer Panic DMEngine -39" this.

Hello,
You can download what you asked for simply following this link:

http://sourceforge.net/projects/lessa

Hope it helps,