{"id":339,"date":"2011-09-22T17:55:29","date_gmt":"2011-09-22T17:55:29","guid":{"rendered":"http:\/\/www.blogs.abeazam.com\/dev\/?p=339"},"modified":"2011-09-22T17:55:29","modified_gmt":"2011-09-22T17:55:29","slug":"xcode-gdb-debugger-commands","status":"publish","type":"post","link":"http:\/\/www.blogs.abeazam.com\/dev\/2011\/09\/xcode-gdb-debugger-commands\/","title":{"rendered":"xCode GDB Debugger Commands"},"content":{"rendered":"

One of the things that I struggled with going from eclipse and Visual Studio to xCode was the the debugger. \u00a0Most of the objects have memory references rather than values. For a long time while developing iOS apps all i would get, or though I had was one cryptic error message. Till I discovered po which stands for print object. This allowed me to print out the contents of an object which can be very useful.<\/p>\n

Here is \u00a0list of gdb commands: (Warning properties are not identified by the\u00a0debugger\u00a0so dont use anything with dot notation)<\/p>\n

po<\/strong> – print object – can be used to print out the likes of NSStrings and NSDictionaries
\nuse: po someObject<\/p>\n

print<\/strong> – prints base types – used to print out to the screen ints floats and the like
\nuse: print myFloat<\/p>\n

set<\/strong> – set a\u00a0variable\u00a0– allows you to set\u00a0variables
\nuse: \u00a0set someString=@”test”<\/p>\n

call<\/strong> – calls a method – can be used to call methods or the properties getters and setters
\nuse: – call [someObjectInstance withString:@”newString”];<\/p>\n

n<\/strong> – Next – always you to travers your code during breck
\nuse: n<\/p>\n

There are 2 main places you can use the commands.<\/p>\n

The first is the consol output during a break or crash just after the gdb:
\n\"\"<\/a><\/p>\n

The second is in a break point first set a break point then click the “Click to add action text” ass seen bellow.
\n\"\"<\/a><\/p>\n

Now you can add you command in the newly\u00a0available text\u00a0field\u00a0that will always be\u00a0triggered\u00a0at that point in the code.
\n\"\"<\/a><\/p>\n

Carful with the\u00a0break\u00a0point\u00a0triggers\u00a0not to confuse your self if you put sets or calls in there.<\/p>\n","protected":false},"excerpt":{"rendered":"

One of the things that I struggled with going from eclipse and Visual Studio to xCode was the the debugger. \u00a0Most of the objects have memory references rather than values. For a long time while developing iOS apps all i would get, or though I had was one cryptic error message. Till I discovered po […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[25,26,28,36,37,53],"tags":[],"_links":{"self":[{"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/posts\/339"}],"collection":[{"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/comments?post=339"}],"version-history":[{"count":0,"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/posts\/339\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/media?parent=339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/categories?post=339"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.blogs.abeazam.com\/dev\/wp-json\/wp\/v2\/tags?post=339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}