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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

VCCLCompilerTool.PreprocessorDefinitions Property 

Gets or sets one or more preprocessor defines. PreprocessorDefinitions exposes the functionality of the compiler's /D option, the MIDL compiler's /D option, and the Resource Compiler's /r option.

Namespace: Microsoft.VisualStudio.VCProjectEngine
Assembly: Microsoft.VisualStudio.VCProjectEngine (in microsoft.visualstudio.vcprojectengine.dll)

string PreprocessorDefinitions { get; set; }
/** @property */
String get_PreprocessorDefinitions ()

/** @property */
void set_PreprocessorDefinitions (/** @attribute InAttribute() */ String Defines)

function get PreprocessorDefinitions () : String

function set PreprocessorDefinitions (Defines : String)

Property Value

One or more preprocessor defines.

See Examples for Project Model Extensibility for information about how to compile and run this example.

The following example modifies the compiler's PreprocessorDefinitions property in the integrated development environment (IDE):

' add reference to Microsoft.VisualStudio.VCProjectEngine.
Imports EnvDTE
Imports Microsoft.VisualStudio.VCProjectEngine

Public Module Module1
    Sub Test()
        Dim prj As VCProject
        Dim cfgs, tools As IVCCollection
        Dim cfg As VCConfiguration
        Dim tool As VCCLCompilerTool
        Dim oldDefs As String
        prj = DTE.Solution.Projects.Item(1).Object
        cfgs = prj.Configurations
        cfg = cfgs.Item(1)
        tool = cfg.Tools("VCCLCompilerTool")
        oldDefs = tool.PreprocessorDefinitions
        tool.PreprocessorDefinitions = "_TEST;" + oldDefs
        MsgBox(tool.PreprocessorDefinitions)
    End Sub
End Module
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