Gets or sets a C-compiler preprocessor option to pass to the MIDL compiler.
Namespace:  Microsoft.VisualStudio.VCProjectEngine
Assembly:  Microsoft.VisualStudio.VCProjectEngine (in Microsoft.VisualStudio.VCProjectEngine.dll)
Syntax
声明
Property CPreprocessOptions As String
    Get
    Set
string CPreprocessOptions { get; set; }
property String^ CPreprocessOptions {
    String^ get ();
    void set (String^ value);
}
abstract CPreprocessOptions : string with get, set
function get CPreprocessOptions () : String
function set CPreprocessOptions (value : String)
Property Value
Type: System.String
A C-compiler preprocessor option.
Remarks
CPreprocessOptions exposes the functionality of the /cpp_opt MIDL option.
See How to: Compile Example Code for Project Model Extensibility for information about how to compile and run this example.
Examples
The following example modifies the CPreprocessOptions 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 VCMidlTool
        prj = DTE.Solution.Projects.Item(1).Object
        cfgs = prj.Configurations
        cfg = cfgs.Item(1)
        tool = cfg.Tools("VCMIDLTool")
        tool.CPreprocessOptions = "test"
    End Sub
End Module
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.