A customer wanted to register a file extension with a complex command line that goes beyond simple string insertion.<\/p>\n
\nWhen the user double-clicks a *.xyz<\/tt> file, we want it to run the Contoso program not only with the file name as a command line, but also with an additional command line argument that is a transformation of the file name.<\/p>\n
For example, if the user double-clicks C:\\Users\\
Chris\\ Awesome.xyz<\/tt>, we want to run the command line<\/p>\n \"C:\\Program Files\\Contoso\\ contoso.exe\" -exceptions C:\\Users\\ Chris\\ Awesome.exceptions C:\\Users\\ Chris\\ Awesome.xyz\r\n<\/pre>\n if a file Awesome.exceptions<\/tt> exists in the same directory as Awesome.xyz<\/tt>. Otherwise, just launch it without the bonus -exceptions<\/tt> option.<\/p>\n
We tried using %~dpn1.exceptions<\/tt>, but that just produces the percent sign and stuff. And it still doesn’t deal with testing whether the exceptions file exists.<\/p>\n<\/blockquote>\n
The command line is just a command line with insertions. It is not a programming language. If you want a programming language, you’ll have to write a program.<\/p>\n
For example, you could write a batch file that looks for a .exceptions<\/tt> file in the same directory as the file whose name was passed on the command line, and then run the contoso.exe<\/tt> program appropriately based on what you discover.<\/p>\n
@echo off\r\nif exist \"%~dpn1.exceptions\" (\r\n echo \"C:\\Program Files\\Contoso\\contoso.exe\" -exceptions \"%~dpn1.exceptions\" \"%1\"\r\n) else (\r\n echo \"C:\\Program Files\\Contoso\\contoso.exe\" \"%1\"\r\n)\r\n<\/pre>\nYou can then use this batch file as the command line.<\/p>\n
\"C:\\Program Files\\Contoso\\Contoso-launcher.cmd\" \"%1\"\r\n<\/pre>\nOf course, this will display a command prompt briefly. You can write a program in a non-console language if that bothers you. At this point, the problem has been reduced to computer programming.<\/p>\n","protected":false},"excerpt":{"rendered":"
If you want a programming language, you know where to find one.<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[25],"class_list":["post-109407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
If you want a programming language, you know where to find one.<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/109407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=109407"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/109407\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=109407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=109407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=109407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}