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VCMidlTool.PreprocessorDefinitions Property

Gets or sets one or more preprocessor defines.

Namespace:  Microsoft.VisualStudio.VCProjectEngine
Assembly:  Microsoft.VisualStudio.VCProjectEngine (in Microsoft.VisualStudio.VCProjectEngine.dll)

string PreprocessorDefinitions { get; set; }

Property Value

Type: System.String
One or more preprocessor defines.

PreprocessorDefinitions exposes the functionality of the compiler's /D (Preprocessor Definitions) option, the MIDL compiler's MIDL Property Pages: General option, and the Resource Compiler's Resources Property Pages option.

See How to: Compile Example Code 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):

[Visual Basic]

' 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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