Syntax:
ifdef name
The ifdef directive controls conditional compilation of the resource file by checking the specified name. If the name has been defined by using a define directive or by using the -d command-line option of rc, ifdef directs the compiler to continue with the statement immediately after the ifdef directive. If the name has not been defined, ifdef directs the compiler to skip all statements up to the next endif directive.
name
Example
This example compiles the BITMAP statement only if the name "Debug" is defined.
#ifdef DebugBITMAP 1 errbox.bmp #endif