Passing large data to DLLs

[User 653255]

Hi all, I need to pass large data( in the order of MBs ) to DLL for processing. When I pass a reference to such object that holds reference to this data from the application and then, trying to access the member variables from passed object causes crash my application. Note that, it works fine if 1. I downsize data in object, 2. I make member variables public. Is there any thing special I need to do when passing and processing large data to DLL? Hope I am clear about the question. Please feel free to ask any questions, that would help to understand problem more correctly. Thanks and regards, Shrinivas

[Alexander M]

1. how many MBs? 2. is this data local memory? Don't try it, just do it! ;-)

[melwyn]

How about using shared memory? -Mel

[Dimitris Vasiliadis]

If you have access to the dll sources, you can try changing the dll to export two functions - Func1 to load (and append) the data, and Func2 will process the loaded data. Then break your data into smaller blocks and call Func1 until all data is loaded, then call Func2 to handle them.

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...Plug & Pray... X|

[User 653255]

call Func1 until all data is loaded, then call Func2 to handle them .... Does this mean that, I am trying to access the data before it is loaded? I am not sure what we mean "Data loaded" here. This may sound primitive question. But I will appreciate further explanation. Thanks and regards, Shrinivas

[Dimitris Vasiliadis]

I think the problem is on passing large amounts of data as parameters. Since you say it works with smaller blocks, what I suggest is break the large data into smaller blocks and call Func1 to pass them to the dll one by one. Finally when you have passed all the smaller blocks to the dll, call Func2 to process them all together as one.