FAQ Wednesday #5

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It’s Wednesday and time for another FAQ session. Here are five frequently asked questions (FAQ). Question 1 Now that you added the Lua File System (LFS), how can I use it to get a list of files in the /Documents directory? Answer The Lua File System was added starting with Corona build 2012.805. You can read the tutorial here. The LFS now makes it possible to create, delete, and access subdirectories. The key to all of this is creating a string containing the path to the directory. In iOS and Android, there are three main directories: Resource, Temporary, and Documents and they are accessed using Corona constants. These userdata constants need to be converted to a string so they can be used with the LFS.


FAQ Wednesday #4

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It’s Wednesday and time for another FAQ session. Here are five frequently asked questions (FAQ). Question 1 When I create functions, I sometimes get error messages saying the function name was nil. I play with the code until the error goes away. What are the rules for getting it right?


FAQ Wednesday

Posted by & filed under Corona SDK, FAQ, Lua, Tech, Training/Support.

It’s Wednesday and time for another five frequently asked questions (FAQ). Question 1 Why do images take longer to load on the new iPad (retina)? Answer This issue came up when a user was using large JPEG images on the new iPad Retina and noticed the time to load the images were a lot higher than on the iPad2. One of the reasons is the new iPad accepts larger image sizes, but we also found out a few things that might help if you have images that take a long time to load. First off, use non-progressive JPEGs. Progressive JPEG take longer to load. How you compress JPEGs makes a difference in load times. Compressing to 70% or 80% can cut down the time to


FAQ Wednesday

Posted by & filed under Corona SDK, FAQ, Tech, Training/Support.

It’s Wednesday and time for another five frequently asked questions (FAQ). Question 1 Should I use PNG or JPG image files in Corona? Answer The answer depends on the quality of the images you need and the size of your app package. Corona supports 32 bit PNG and 32 bit JPGs. PNG supports transparencies with loss-less compression where JPGs are compressed (lossy) but supports a wider range of colors. PNG files are generally a larger file size than JPGs for the same resolution. This can affect the size of your app package. As for the amount of texture memory consumed, both PNG and JPG take up the same amount of openGL memory because the images are uncompressed when loaded into memory. You should also be


FAQ Wednesday

Posted by & filed under Corona SDK, FAQ, Lua, Tech, Training/Support.

This is a new series of blog posts that will appear every Wednesday and covers five frequently asked questions (FAQ) from support cases, the forum, and documentation comments. Hopefully there will be something here for both the experienced Corona users and those using Corona for the first time. So let’s get started.