C++ resource file(.rc)

Question

Hi,

So, I have a .rc resource file, i need to add some resource based on some conditional macro(#ifdef),
I have defined the macros in configuration property->Resource->General->Preprocessor definitions.
But still the macro is not getting identified.I checked the rc file in resource view and that particular resource is not being defined.Do i have to define the macro at some place else? I am on visual studio 2022.

Answer 1

For a Win32 C++ project define the macro in the resource.h file.

For example --

From the .rc file

#ifdef TWODIALOGS
IDD_DIALOG1 DIALOGEX 0, 0, 309, 176
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
    DEFPUSHBUTTON   "OK",IDOK,198,155,50,14
    PUSHBUTTON      "Cancel",IDCANCEL,252,155,50,14
END
#endif

resource.h file

//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by WindowsProject3.rc
//
#define IDC_MYICON                      2
#define IDD_WINDOWSPROJECT3_DIALOG      102
#define IDS_APP_TITLE                   103
#define IDD_ABOUTBOX                    103
#define IDM_ABOUT                       104
#define IDM_EXIT                        105
#define IDI_WINDOWSPROJECT3             107
#define IDI_SMALL                       108
#define IDC_WINDOWSPROJECT3             109
#define IDR_MAINFRAME                   128
#define IDD_DIALOG1                     129
#define IDC_STATIC                      -1

#define TWODIALOGS

// Next default values for new objects
// 
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NO_MFC                     1
#define _APS_NEXT_RESOURCE_VALUE        130
#define _APS_NEXT_COMMAND_VALUE         32771
#define _APS_NEXT_CONTROL_VALUE         1000
#define _APS_NEXT_SYMED_VALUE           110
#endif
#endif

With macro defined -

With macro commented out