Integrating COM in Java

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29 Integrating COM
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<CFCATCH> <!--- The object doesn t exist, so create it ---> <CFOBJECT ACTION= CREATE CLASS= Word.Application NAME= objWord TYPE= COM > </CFCATCH> </CFTRY>
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This way, ColdFusion creates a new COM object only if one doesn t already exist instead of creating a new one on every request to this page. Another attribute of CFOBJECT is named context and can be one of three values: INPROC, LOCAL, or REMOTE. INPROC means that the COM object is created inside ColdFusion Server s address space; these objects are usually made as DLLs. LOCAL means that the COM object is its own executable and it s running on the same machine as ColdFusion Server. (By the way, this is a case where you would use action= CONNECT rather than action= CREATE so that you don t have 50 executables running on your system at the same time.) REMOTE means that the COM object is its own executable but is executing on a different machine than ColdFusion Server. But why would you want to call a COM object on a different machine The idea is the same as putting ColdFusion on one machine and the database server on another. Because COM can be memory-intensive, for COM to be on a machine where it can t affect the overall performance of ColdFusion only makes sense. To call an object remotely, you must do the following three things: Use a CLSID instead of a ProgID for the name of the class. Remote invocation doesn t understand ProgIDs such as Word.Application; instead, it understands a CLSID such as {000209FF-0000-0000-C000-000000000046}. Set the context to REMOTE. Add a Server attribute to CFOBJECT to tell the tag which server to connect to. The server can be specified in the following five different ways:
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\\uncname uncname http://www.servername.com www.servername.com 127.0.0.1
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In the following example you re connecting to a Word.Application object on a remote system by using a Universal Naming Convention (UNC) path:
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<CFOBJECT ACTION= CONNECT CLASS= {000209FF-0000-0000-C000-000000000046} NAME= objWord TYPE= COM CONTEXT= REMOTE SERVER= \\myothermachine >
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Part V Integrating ColdFusion MX with Other Technologies
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UNC is an industry-standard way of naming computers and network shares; for CFOBJECT, the UNC is two backslashes followed by the name of the remote computer. If you want to create an object by using CFSCRIPT, you can use CreateObject() as follows:
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<cfscript> objXML = CreateObject( COM , MSXML2.DOMDocument ); </cfscript>
In the preceding line, you created a COM object based on the MSXML2.DOMDocument class using CreateObject() rather than CFOBJECT. The class name used with CreateObject() is just like the class name with CFOBJECT: You can use either a ProgID or a CLSID. Three more parameters to CreateObject() (although you only use two; the middle one is CORBAspecific) represent the context and Server attributes of CFOBJECT, as follows:
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<cfscript> objXML = CreateObject( COM , MSXML2.DOMDocument , REMOTE , , \\myothermachine ); </cfscript>
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Unfortunately, you have no way to connect to a COM object rather than to create a new one by using CreateObject().
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Getting and Setting an Object s Properties
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After you have created a COM object, you can set its properties and call its methods. Properties are the data stored with the object; for example, a Word Document object has a Title property, a Filename property, and many others. To read the value of a property, you get the property. Similarly, to set the value of a property, you set the property. Some properties support both operations, whereas others support only getting the property s value. Setting a property uses what should be a familiar syntax to you, as follows:
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<cfset myCOMObject.myPropertyName = some value >
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You access a COM object s properties in the same way that you access a structure s keys by using dot notation. The difference is that you can t create new properties in using COM objects as you can with structures. Getting a property from a COM object is just as easy as setting it, as the following example shows:
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