Gets or sets a value that specifies one or more preprocessor undefines. UndefinePreprocessorDefinitions exposes the functionality of the C++ compiler's /U, /u (Undefine Symbols) option and the MIDL compiler's MIDL Property Pages: Advanced option.
Namespace: Microsoft.VisualStudio.VCProjectEngine
Assembly: Microsoft.VisualStudio.VCProjectEngine (in Microsoft.VisualStudio.VCProjectEngine.dll)
Syntax
'Declaration
Property UndefinePreprocessorDefinitions As String
string UndefinePreprocessorDefinitions { get; set; }
property String^ UndefinePreprocessorDefinitions {
String^ get ();
void set (String^ value);
}
abstract UndefinePreprocessorDefinitions : string with get, set
function get UndefinePreprocessorDefinitions () : String
function set UndefinePreprocessorDefinitions (value : String)
Property Value
Type: System.String
A string that specifies one or more preprocessor undefines.
Examples
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 UndefinePreprocessorDefinitions 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 oldUndefs As String
prj = DTE.Solution.Projects.Item(1).Object
cfgs = prj.Configurations
cfg = cfgs.Item(1)
tool = cfg.Tools("VCCLCompilerTool")
oldUndefs = tool.UndefinePreprocessorDefinitions
tool.UndefinePreprocessorDefinitions = "_DEBUG;" + oldUndefs
MsgBox(tool.UndefinePreprocessorDefinitions)
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.