How to verify if there is a datatypes class installed to open specific dataype, without opening it first!

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Wed, 2015-05-20 17:59

broadblues

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Last seen: 4 years 9 months ago

Joined: 2012-05-02 21:48

How to verify if there is a datatypes class installed to open specific dataype, without opening it first!

By using ObtainDataType() I can easily find the group, basename etc of the datatype of an object, but how do I verify if there is class available to handle it?

For example ObtainDatatype() will return System binary for an executable but if I have no binary.datatype installed I will not be able to open it.

I don't wish to 'test by opening' as some files in the datatset might be large and so take quite a while to process a long list file just to rject the one or two that might not be openable.

Wed, 2015-05-20 19:33

broadblues

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Last seen: 4 years 9 months ago

Joined: 2012-05-02 21:48

I think I found a solution in

I think I found a solution in the following, I pass the dth_BaseName filed to the following.

BOOL VerifyDataType(STRPTR basename)
{
	TEXT pattern[] = "DataTypes/%s.datatype";
	BOOL result = FALSE;
 
	if(basename)
	{
		STRPTR fullname = MVAllocVec(sizeof(pattern) + strlen(basename) + 1);
		if(fullname)
		{
			struct Library *tempbase;
			SNPrintf(fullname,sizeof(pattern) + strlen(basename) +1, pattern, basename);
			if((tempbase = OpenLibrary(fullname,0L)))
			{
				result = TRUE;
				CloseLibrary(tempbase);
			}
		}
	}
	return result;
}

Is there a better solution?

Mon, 2015-05-25 21:07

(Reply to #2) #3

broadblues

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Last seen: 4 years 9 months ago

Joined: 2012-05-02 21:48

This solution appears to

This solution appears to cause a crash in ascii.datatype (on subsequent usage to create a DTObject) when invoked before any datatype has been accessed, so does amyone have any suggestions as to better more system friendly method?

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