{"id":16,"date":"2009-04-20T21:36:34","date_gmt":"2009-04-20T21:36:34","guid":{"rendered":"\/blogs\/benbarefield\/archive\/2009\/04\/20\/writing-to-a-cd.aspx"},"modified":"2009-04-20T21:36:34","modified_gmt":"2009-04-20T21:36:34","slug":"writing-to-a-cd","status":"publish","type":"post","link":"https:\/\/www.benbarefield.com\/blog\/2009\/04\/20\/writing-to-a-cd\/","title":{"rendered":"Writing to a CD"},"content":{"rendered":"

In one of my projects I needed to be able to write data to a CD. I found a great article at code guru that helped me out:
http:\/\/www.codeguru.com\/csharp\/.net\/net_general\/tipstricks\/article.php\/c15201<\/a><\/p>\n

However, I did find one bug in his code. On page three he declares his external functions using the DllImport, here is the bugged one:<\/p>\n

\n
\n
public<\/span> static<\/span> extern<\/span> bool<\/span><\/pre>\n
   SHGetPathFromIDList(IntPtr ilPtr, string<\/span> sPath);<\/pre>\n<\/div>\n<\/div>\n
The problem I encountered was that after calling the function, my path string was unchanged.  The best explanation I am able to come up with is that strings behave like value types. I did not pass the string in as a ref or out parameter, so my instance of it doesn’t actually change when changed inside the function.  To fix this I changed the string to a StringBuilder (which is a reference type):<\/p>\n
\n
\n
public<\/span> static<\/span> extern<\/span> bool<\/span> SHGetPathFromIDList(<\/pre>\n
    IntPtr ilPtr, StringBuilder sPath);<\/pre>\n<\/div>\n<\/div>\n
Before I called this function, I just created a StringBuilder with a large capacity and it fixed my problem.<\/p>\n
My customer only needed this to work in Windows XP, thankfully, because the way Vista handles CD writing seems to mess up this method.  When testing on a Vista machine either the drive was considered Not Ready or when it went to do the writing the OS thought the disk was full or write protected.<\/p>\n","protected":false},"excerpt":{"rendered":"
In one of my projects I needed to be able to write data to a CD. I found a great article at code guru that helped me out:http:\/\/www.codeguru.com\/csharp\/.net\/net_general\/tipstricks\/article.php\/c15201 However, I did find one bug in his code. On page three … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/posts\/16","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/comments?post=16"}],"version-history":[{"count":0,"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/posts\/16\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/media?parent=16"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/categories?post=16"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.benbarefield.com\/blog\/wp-json\/wp\/v2\/tags?post=16"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}