CUpgradeApplication - Remotely Upgrade Applications

Screenshot

Introduction

CUpgradeApplication is a C++ class that can check a remote web server and detect if the version on the server is newer than the one running. If that is the case then the class will download the newer version and upgrade the older version. Oh and this version does not need MFC. Which is a good thing!

What Do I Get With This?

Huh? See the above section. That is what you get!

But You Said Two Lines Of Code!?! (AKA: How Can I Use It?)

It's as simple as this:

CUpgradeApplication * UpgradeApp = new CUpgradeApplication;
UpgradeApp->UpgradeViaWeb ("My Application", 
                           "http://myserver.com/myapplication", 
                           "myapp_version.dat", 
                           CURRENT_VERSION);

The myapp_version.dat would contain something like this:

---- Start Of File ----
Title: "<title>"
Version: "<version>"
Filename: "<filename>"
----  End Of File  ----

The system is very simple and self-explanatory so have a quick look through at the source to get an indepth understanding!

Ok - That's Simple Enough; Anything Else

This is the usual nonsense - should you want to use it!

EMail me for permission to use/include (always given). I just want to know what purpose it is being used for. It is provided completely for "Non-Commercial Usage."
Include the files in your C++ project.
Compile!
Play!

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

voodoopriestess

Researcher

Germany

Member

Iain Chesworth graduated from Heriot-Watt University in June of 2002 in Computer Science and Physics. He now works as a C++ programmer and plays with code in his spare time. He is also a keen cyclist and swimmer.

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Missing headre in demo application

Rudolf Jan Heijink

0:18 18 Sep '04

The demo application has a missing header: wspiapi.h. It seems not to be included in VC6. Where can I find this file, and the associated api? Otherwise, this class prably exacty does what I need. Regards, Rudolf Heijink
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Re: Missing headre in demo application

Neville Franks

0:44 18 Sep '04

It is included in the Platform SDK. You need to download this from http://msdn.microsoft.com/default.aspx[^] Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com
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Re: Missing headre in demo application

Rudolf Jan Heijink

12:32 20 Sep '04

Thanks for your help.

I tested the Upgrade class and discuvered it is not very robust. I did not upload a version document to my website, which results into an application crash. What happnes is this:
If you ask for a non-existent document, the web servers sends an HTML document, reproting the error. The upgrade class document thinks this is the Version document. It starts parsing it, using strchr, but forgets to check the result. Because the string "Version" is not found, a NULL string is returned. This causes a crash little later.

So, I think this source code needs some reworking before it can beused in practice.

Regards,

Rudolf Heijink

Re: Missing headre in demo application

Neville Franks

13:02 20 Sep '04

Hi Rudolf, I don't use this code so I can't comment on it. I just replied about the .h issue. I do have similar code to this that runs in a background thread, so the user isn't held up in anyway while the new version check is taking place. Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com
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Re: Missing headre in demo application

voodoopriestess

13:26 20 Sep '04

The code was something that I knocked up to add a quick update procedure to my application. It was never "engineered" as such. It does need a lot of work. I may well look into doing something with it so that it can work better and be more robust.

Any help / comments / tips would be appreciated.

----

"I would be careful in separating your weirdness, a good quirky weirdness, from the disturbed weirdness of people who take
pleasure from PVC sheep with fruit repositories."

Good Job...

freewill

23:19 15 Dec '03

I really appreciate your 'Simple' and 'Useful' code... Recently, I need a program like this one and decided to make by myself. But, Your code is very that.
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full code along with workspace

yendluri

21:31 8 Sep '03

hai , iam new to this filed ple will u send me the full source includes work space iam getting too many errors regards
Sign In·View Thread·Permalink	1.00/5 (1 vote)

Wouldn't compile

DJWALSH

8:27 24 Nov '02

I could not get either the source or the demo to compile. Do I need to download a llibrary or something? I got several linking errors in the demo and a C1010 error when I try to use the source. Any thoughts? Darroll
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Re: Wouldn't compile

khmerkidnow

11:41 9 Apr '03

add #include "stdafx.h" and you'll be fine
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Memory Leaks & temp path

Kwakkie

1:19 9 Sep '02

You might want to use delete, if you used new and you don't need it anymore (eg OldVersion is never deleted).

Also, you might want to change the temp path from:

// Create a temporary file. 

	GetTempFileName ("\\TEMP",  "CUA", 0, szTempName);

to:

char* pBuf = new char[MAX_PATH];

	GetTempPath(MAX_PATH, pBuf);

	GetTempFileName (pBuf,  "CUA", 0, szTempName);

	delete[] pBuf;

Temp file creation failed on my PC when using \\TEMP.

You might want to call DisconnectFromWeb() if something failed, or if current version is the latest version.

New and improved: kwakkelflap.com

"When I hear of Schrödinger's cat, I reach for my gun." - Stephen Hawking

Re: Memory Leaks & temp path

sdiazdiaz

6:36 9 Oct '03

This also leaks with OldVersion, NewVersion members and szBuffer var.
Solution:

Modify the code to see in "upgrade.h":

typedef struct tagVERSIONINFO {
tagVERSIONINFO(){
szVersion=NULL;
szFilename=NULL;
};

~tagVERSIONINFO(){
if (szVersion!=NULL){
delete szVersion;
szVersion=NULL;
}
if (szFilename!=NULL){
delete szFilename;
szFilename=NULL;
}
char * szVersion;
char * szFilename;

};

The same in "upgrade.cpp":

CUpgradeApplication::CUpgradeApplication ()
{

NewVersion=NULL;
OldVersion=NULL;

bDLLFailure = false;
...

CUpgradeApplication::~CUpgradeApplication ()
{
if (OldVersion!=NULL){
delete OldVersion;
OldVersion=NULL;
}

if (NewVersion!=NULL){
delete NewVersion;
NewVersion=NULL;
}

// Free the WinInet.Dll module.
FreeLibrary (hWinInet);
}

bool CUpgradeApplication::RetrieveFileFromWeb (char * szUrl, char * szFileName)
{
...
if (hURL == NULL) {
ErrorHandler ("Cannot connect to upgrade URL!");
delete szBuffer;
return false;
}
...
if (hTempFile == INVALID_HANDLE_VALUE) {
ErrorHandler ("Cannot create a temporary file!");
delete szBuffer;
return false;
}
...
delete szBuffer;
return true;
}

Enjoy it,

sdiaz

Looking good

Kwakkie

0:02 9 Sep '02

Like your work! Too bad it's in GNU General Public License... New and improved: kwakkelflap.com "When I hear of Schrödinger's cat, I reach for my gun." - Stephen Hawking
Sign In·View Thread·Permalink	2.00/5 (1 vote)