问题
I ported some objective-c/CoreGraphics code that takes a screenshot of multiple monitors but it's not working. The jsctypes guys won't be able to help because the section is just me answering questions lol
The objc/cg code is from here: https://stackoverflow.com/a/28247749/1828637
My jsctypes type/struct/declares are here: https://github.com/Noitidart/NativeShot/blob/mac-troubleshooting/modules/ostypes_mac.jsm
The jsctypes port is here: https://github.com/Noitidart/NativeShot/blob/mac-troubleshooting/modules/workers/MainWorker.js#L443-656
And the last line is line 643 which causes the crash:
var rez_writeToFile = ostypes.API('objc_msgSend')(data, ostypes.HELPER.sel('writeTofile:atomically:'), myNSStrings.get(OS.Path.join(OS.Constants.Path.desktopDir, 'full_ss.png')), ostypes.CONST.YES);
This coincides with the objectivec of
[data writeToFile:@"/tmp/screenshot.png" atomically:YES];
except i changed path to ...desktop/...png
I wrote to sepearte gists, to align the lines in text diff software to make sure I did everything.
- Here is objc/cg: https://gist.github.com/Noitidart/8affcd8bee60d22dcb52
- and here is jsctypes: https://gist.github.com/Noitidart/3d4a4e8df625dbea8cc1
I dont think i missed anything i dont know why it crashes on that final line
Do any of the ObjC/CG people see any type definition that is wrong or something that I missed (for example the ObjC code uses compound statments I'm not sure I understood/translated them correctly in the port).
回答1:
Wowww so after struggling for like some hours then posting this I realize it right away haha
Casing typo in selector!! I had writeTofile:atomically instead of writeToFile:atomically!
If anyone would like to test this out, it's a simple firefox addon test case.
- Install an addon that allows installing addons from github repos from here: https://addons.mozilla.org/en-US/firefox/addon/github-extension-installer/
- Go to commit on this branch that works here: https://github.com/Noitidart/NativeShot/tree/f5f2e8606d3c5c657e901239d3ceb8c8c79a4494
- Then click the "Add to Firefox" button at bottom right, below the "Download Zip" button
- Click on the toolbar button icon that gets added to firefox, as seen in this screenshot: http://i.imgur.com/n7lSxje.png
- Check desktop you now have a single png file with a screenshot of all the monitors, huge props to @KenThomas!
来源：https://stackoverflow.com/questions/30173185/ported-osx-obj-c-cg-screenshot-code-to-js-ctypes-crash-on-final-line