Monday, February 20, 2006

Hashtables in JavaScript

[This was originally posted at]

As a bit of trivia for the day, JavaScript can handle pseudo-hashtables, via the Array object. You can reference the item with its key, and enumerate through all the objects.

function DoHashTest()
  var h = new Array();
  h["aaa"] = "Aardvark";
  h["bbb"] = "Babboon";
  var s = "";
  //This won't work, length will be 0.
  for (var i = 0; i < h.length; i++)
     s += h[i];

  //Cycle through like a hash:
  for (var i in h)
    s += i;

Wednesday, February 1, 2006

MSBuild error MSB3073 "The batch file cannot be found"

[This was originally posted at]

We've migrated to MSTest, and are running tests through MSBuild. I came across an interesting issue (that seems like a bug).

Normally I would expect that if the test passes in Test Viewer (the UI), then it would also pass when I run it in MSTest from the command line, and it would still pass when I call it from MSBuild. However, I found this not always so.

One of my tests wrote out files to the temp directory, as generated by "System.IO.Path.GetTempPath()". I then cleaned up the test output by deleting the directory, and recreating it. This worked fine in both UI, and MSTest, but failed in MSBuild with the following error:

Run Configuration: Default Run Configuration
The batch file cannot be found.
C:\myProject\myBuild.msbuild(21,5): error MSB3073:

The command ""C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\MsTest"
/testcontainer:C:\myTests.dll /resultsfile:myOutput\UnitTests.trx" exited with code 1.
Done building target "UnitTest" in project "myBuild.msbuild" -- FAILED.

By appending a sub directory to the temp directory, like "System.IO.Path.GetTempPath()" + "temp\", the tests all passed again. My guess is that MSBuild sent something to this output directory that my cleanup method was inadvertently deleting.