CFTRACE |
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Description
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Displays and logs debugging data about the state of an application at the time the cftrace tag executes. Tracks runtime logic flow, variable values, and execution time. Displays output at the end of the request or in the debugging section at the end of the request; or, in Dreamweaver MX and later, in the Server Debug tab of the Results window.
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ColdFusion logs cftrace output to the file logs\cftrace.log, in the ColdFusion installation directory.
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To permit this tag to execute, you must enable debugging in the ColdFusion Administrator. Optionally, to report trace summaries, enable the Trace section. |
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Category
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Debugging tags, Variable manipulation tags
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Syntax<cftrace
abort = "Yes or No"
category = "string"
inline = "Yes or No"
text = "string"
type = "format"
var = "variable_name"
</cftrace>
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See also
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cfdump, cferror, cfrethrow, cftry, Chapter 18, "Debugging and Troubleshooting Applications," in Developing ColdFusion MX Applications
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History
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ColdFusion MX: Added this tag.
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Usage
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You cannot put application code within this tag. (This avoids problems that can occur if you disable debugging.)
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This tag is useful for debugging CFML code during application development.
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You can display cftrace tag output in the following ways:
- As a section in the debugging output
- In-line in an application page, and as a section in debugging output. If you specify in-line tracing, ColdFusion flushes all output up to the cftrace tag, and displays the trace output when it encounters the tag.
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This is an example of a log file entry:
"Information","web-4","04/08/02","23:21:30", ,"[30 ms (1st trace)]
[C:\cfusion\wwwroot\generic.cfm @ line: 9] -
[thisPage = /generic.cfm] "
"Information","web-0","04/08/02","23:58:58", ,"[5187 ms (10)]
[C:\cfusion\wwwroot\generic.cfm @ line: 14] - [category]
[thisPage = /generic.cfm] [ABORTED] thisPage "
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For a complex variable, ColdFusion lists the variable name and the number of elements in the object; it does not log the contents of the variable.
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The following example traces a FORM variable that is evaluated by a cfif block:
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Example<cftrace var="FORM.variable"
text="doing equivalency check for FORM.variable"
category="form_vars"
inline="true">
<cfif isDefined("FORM.variable") AND #FORM.variable# EQ 1>
<h1>Congratulations, you're a winner!</h1>
<cfelse>
<h1>Sorry, you lost!</h1>
</cfif>
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