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How can I schedule tasks based on DLL or EXE using Symbian C++?

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Article Metadata
Compatibility
Platform(s): S60 1st Edition
S60 2nd Edition
S60 2nd Edition (initial release)
S60 1st Edition
Article
Created: User:Technical writer 2 (12 Feb 2004)
Last edited: lpvalente (17 Nov 2012)

Overview

How can I schedule tasks based on DLL or EXE?

Description

Scheduling DLL or EXE-based tasks using the RScheduler class requires a certain technique to implement the EXE and DLL.

Solution

To schedule a DLL-based task in the emulator, implement the DLL as follows:

//MyDll.cpp
LOCAL_D TInt StartDLL(TAny* aParam)
{
CMyDll* self = new(ELeave) CMyDll;
self->Test();
return(KErrNone);
}
TInt CMyDll::Test()
{
return KErrNone;
}
EXPORT_C TThreadFunction ThreadFunction()
{
// Ordinal one export that returns the function
// which extracts the pseudo-command line
// under WINS, this is passed as thread data).
return StartDLL;
}
GLDEF_C TInt E32Dll(TDllReason /*aReason*/)
{
return(KErrNone);
}

Further information: The aParam passed in StartDLL can be used as follows to create CScheduledTask objects:

TFileName* fileName = reinterpret_cast<TFileName*>(aParam);
CcFileStore* store = CDirectFileStore::OpenLC(iFsSession, fileName, EFileRead);
RStoreReadStream instream;
instream.OpenLC(*store, store->Root());
// Get task count
TInt count = instream.ReadInt32L();
__ASSERT_ALWAYS(count > 0, Panic(ETaskExePanicNoScheduledTasks));
for (TInt i=0;i<count;i++)
{
CScheduledTask* task =
CScheduledTask::NewLC(instream);
}
To schedule an EXE-based task in the device, implement the EXE as follows:
GLDEF_C TInt E32Main()
{
TBuf<256> cmd;
RProcess().CommandLine(cmd);
return Test(cmd);
}
LOCAL_C TInt Test(TDesC& aTaskDataFile)
{
// Extract scheduled tasks as shown above.
}
This page was last modified on 17 November 2012, at 21:31.
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