[SalesForce] Custom Object & Field Creation through CSV Upload

Make sure your package.xml and the directories containing the metadata component files are in the root of your zip file. In other words, make sure you zip the contents of your 'unpackaged' directory and not the directory itself. This is most likely the reason it is not able to find the package.xml file. I also typically don't specify the singlePackage option either. The docs are a little vague on this i agree...

Every .zip file contains a project manifest, a file named package.xml, and a set of directories that contain the components. The manifest file defines the components you are trying to retrieve or deploy in the .zip file.

(i often think it would be useful to show a directory structure, so i've just used the feedback feature at the bottom of the documentation topic to say so).

Also the missing call to get additional information you need (and the one Workbench is using) is the checkDeployStatus call (note that from API 29 onwards checkStatus is not required you can use checkDeployStatus directly, see deploy).

if you have setup ant correctly you can follow below steps

1. Create deploy folder inside c:\apache-ant\sample folder

2. Create one package.xml and objects folder

   <?xml version="1.0" encoding="UTF-8"?>
   <Package xmlns="http://soap.sforce.com/2006/04/metadata">
     <types>
       <members>xyz__c</members>
       <name>CustomObject</name>
   </types>
   <version>35.0</version>
   </Package>
   

3. create a xml file inside objects folder and name it with xyz__c.object and put your xml content which you have added as question.

4. I assume that you have setup ant deploy in build.xml so you can run command ant deploy and it will deploy this object in your target org.