{"id":2728,"date":"2010-09-01T22:36:35","date_gmt":"2010-09-02T02:36:35","guid":{"rendered":"http:\/\/mjtsai.com\/blog\/?p=2728"},"modified":"2010-09-01T22:36:38","modified_gmt":"2010-09-02T02:36:38","slug":"dr-gregory-parker-department-of-diagnostic-engineering","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2010\/09\/01\/dr-gregory-parker-department-of-diagnostic-engineering\/","title":{"rendered":"Dr. Gregory Parker, Department of Diagnostic Engineering"},"content":{"rendered":"<p><a href=\"http:\/\/www.sealiesoftware.com\/blog\/archive\/2010\/09\/01\/Dr_Gregory_Parker_Department_of_Diagnostic_Engineering.html\">Greg Parker<\/a>:<\/p>\n<blockquote cite=\"http:\/\/www.sealiesoftware.com\/blog\/archive\/2010\/09\/01\/Dr_Gregory_Parker_Department_of_Diagnostic_Engineering.html\"><p>Go back to the board. Symptom: the object was allocated as an <code>NSPathStore2<\/code>. Symptom: the object&rsquo;s <code>isa<\/code> pointer is now <code>0xa0050000<\/code>, which is not <code>NSPathStore2<\/code>. What should the <code>isa<\/code> pointer&rsquo;s value have been? <code>otool<\/code> and <code>objc_getClass()<\/code> agreed: the correct <code>isa<\/code> pointer should have been <code>0xa005f198<\/code>. <code>0xa0050000<\/code> is suspiciously similar. Theory: something had cleared two bytes of this object, leaving a nonsense isa pointer. <code>@\"tzm-Latn\"<\/code> was a red herring.<\/p><\/blockquote>\n<p>Great post.<\/p>","protected":false},"excerpt":{"rendered":"<p>Greg Parker: Go back to the board. Symptom: the object was allocated as an NSPathStore2. Symptom: the object&rsquo;s isa pointer is now 0xa0050000, which is not NSPathStore2. What should the isa pointer&rsquo;s value have been? otool and objc_getClass() agreed: the correct isa pointer should have been 0xa005f198. 0xa0050000 is suspiciously similar. Theory: something had cleared [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"","apple_news_api_id":"","apple_news_api_modified_at":"","apple_news_api_revision":"","apple_news_api_share_url":"","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-2728","post","type-post","status-publish","format-standard","hentry","category-programming-category"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/2728","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=2728"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/2728\/revisions"}],"predecessor-version":[{"id":2729,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/2728\/revisions\/2729"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=2728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=2728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=2728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}