ios - Objective-C - EXC_BAD_ACCESS error with ALAsset and XmlWriter -

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i'm using alassetlibrary retrieve information images on device (ios simulator) moment. have needed information, want write them xml file. i'm using xmlstreamwriter (https://github.com/skjolber/xswi) simple , easy use. problem i'm having exc_bad_access (code=1) error when run application. know related streamwriter because if comment lines of code program work perfectly. here there code (i'm using arc):

xmlwriter* xmlwriter = [[xmlwriter alloc]init]; [xmlwriter writestartdocumentwithencodingandversion:@"utf-8" version:@"1.0"]; [xmlwriter writestartelement:@"photos"];  nsmutablearray *list = [[nsmutablearray alloc] init]; alassetslibrary* library = [[alassetslibrary alloc] init]; [library enumerategroupswithtypes:alassetsgroupall usingblock:^(alassetsgroup *group, bool *stop) { if (group) {    [group setassetsfilter:[alassetsfilter allphotos]];    [group enumerateassetsusingblock:^(alasset *asset, nsuinteger index, bool *stop){        if (asset){                 [xmlwriter writestartelement:@"photos"];                 nsstring *description = [asset description];                 nsrange first = [description rangeofstring:@"urls:"];                 nsrange second = [description rangeofstring:@"?id="];                 nsstring *path = [description substringwithrange: nsmakerange(first.location + first.length, second.location - (first.location + first.length))];                 [xmlwriter writeattribute:@"id" value:path];                 [xmlwriter writeendelement:@"photos"];                                 }         }];     } } failureblock:^(nserror *error) {     nslog(@"error enumerating assetlibrary groups %@\n", error); }]; [xmlwriter writeendelement]; [xmlwriter writeenddocument]; nsstring* xml = [xmlwriter tostring]; nslog(@"xml: %@", xml);

any idea of can problem?

i have image related error: error image

thanks

enumerategroupswithtypes calls block process found information asynchronously. so, calling [xmlwriter writeenddocument before have ever written real content writer.

you need change how complete write operation done inside block , when group passed nil. add else block existing check , put 

[xmlwriter writeendelement]; [xmlwriter writeenddocument]; nsstring* xml = [xmlwriter tostring]; nslog(@"xml: %@", xml);

in (and whatever subsequently do).


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