Create two macro variables:
• &FILRF will contain the fileref (Mydir) to be used within the FILENAME function.
• &RC will contain the results from the FILENAME function. The returned value is a
0 if it is successful.
The FILENAME function assigns the fileref (Mydir) to the directory passed to the macro
Create a macro variable named &DID that uses the DOPEN function to open the
directory. The DOPEN function returns a directory identifier value. The returned value is
0 if the directory cannot be opened.
Use a %IF condition to make sure the directory was opened successfully.
%if &did ne 0 %then %do;
Create a macro variable named &MEMCNT that uses the DNUM function to return the
number of members within the directory.
Use the %DO statement to loop through the entire directory based on the number of
members returned from the DNUM function.
%do i = 1 %to &memcnt;
Create a macro variable named &NAME that uses the DREAD function to return the
name of each file. The %QSCAN function uses -1 as the second argument to start at the
back of the filename. The third argument uses the period as the delimiter. This causes the
extension of the file to be returned and to be assigned to the macro variable &NAME.
Use the %IF statement to verify that each file contains an extension. If the file does not
contain an extension, then the contents of the %DO statement do not execute.
%if %qupcase(%qsysfunc(dread(&did,&i))) ne %qupcase(&name) %then %do;
Use the %IF statement to verify that the extension matches the second parameter that is
passed to the macro. If the condition is true, then increment a counter (&CNT) by 1. The
%PUT statement prints the full name to the log. PROC IMPORT is used to read
each .csv file that is returned and creates a data set named DSNx, where x is from the
counter named &CNT.
%if %superq(ext) = %superq(name) %then %do;
proc import datafile="&dir\%qsysfunc(dread(&did,&i))"
448 Appendix 5 • SAS Macro Examples