I may be off on an island by myself here but I thought I'd add some more
info just in case someone recognizes it and has a useful thought.
The error described below occurs because the data I sent through
NSFileHandle to NSData (in the subtask) was actually the elements of a
vector<myStruct>
[just the array, not the vector header].
myStruct itself contains four fields which are STL containers and, hence,
have ctors/dtors, etc., of their own.
The fields are two strings, a list and a map, the latter two being empty.
If I create a pseudo_myStruct for testing that lacks these four fields, then
everything works.
Therefore, there is some STL/malloc issue involved in recreating
vector<myStruct> with its STL containers
from the bytes recovered from an NSData object regardless of how one
accesses those bytes. [I've tried all of the available NSData methods.]
Also, I had expected the copy in the subtask to be shallow but I might have
been mistaken on that score.
That is the limit of my knowledge about this and, if anyone has been down
this road before, I'd appreciate a clue or two.
Thanks again.
>In a Cocoa app targeting Leopard, I am getting a malloc error when using the
>NSData method
>
>- (void)getBytes:(void *)buffer
>
>
>My function is as follows:
>
>-(void)getDataSz:(void*)data ofSize:(NSUInteger)sz
>{
> NSData *theData = [input readDataOfLength:sz];
> [theData getBytes:data]; // <-- no error when commented out
>}
>
>This function is actually in a subtask and
>input
>is an NSFileHandle.
>
>Input is reading data (from the main task) correctly with no error.
>However,
>
>[theData getBytes:data];
>
>generates the following error (most of the time):
>
>malloc: *** free() called with 0x9aadca0 with refcount 0
>malloc: *** auto malloc[3230]: agc error for object 0x9aadca0: Deallocating
>a non-block
>
>In normal operation, getDataSz takes in a buffer allocated by an STL vector
>in the following call:
>
>[mySubtaskServer getDataSz:&my_vec[0] ofSize:dataSize];
>
>If (just for testing), I replace the argument, data, with a local malloc
>buffer (in getDataSz) and free it before exiting, then I do not see this
>error.
>
>FWIW, I also do not see this error in an earlier call in which the amount of
>data read is less than a block (4096 bytes).
>
>The Build options have
>Call C++ Default Ctors/Dtors in Objective-C
>set to YES
>and garbage-collection is Supported.
>
>Compiler is gcc 4.2.
>
>Is there something else I should be doing here?
>Thanks.
--
Mike McLaughlin
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