#!F-adobe-helvetica-medium-r-normal--18* #!N #!CNavyBlue #!N #!Raddtwo Add2 Module Example--Add Two Data Fields #!N #!EC #!N #!N This module adds together the data components of two input Fields. Thus, one of its functions is to ensure that the hierarchies of the two input Objects match one-to-one. #!N #!N The Add2 module takes two inputs: #!F-adobe-times-bold-r-normal--18* field1 #!EF and #!F-adobe-times-bold-r-normal--18* field2 #!EF . Each is of type #!F-adobe-times-bold-r-normal--18* field #!EF and has no default value. #!N #!N The Add2 module has one output, #!F-adobe-times-bold-r-normal--18* result #!EF , of type #!F-adobe-times-bold-r-normal--18* field #!EF . #!N #!N #!F-adobe-times-bold-r-normal--18* REPEAT STEPS (1) THROUGH (5) #!EF of the first example (see #!Laddmodx,dxall1028 h Add Module Example--Add a __________________________________ Number to Every Data Value #!EL ), using the file name "add2" instead of "add." Step (5) will produce files add2.c, add2.mdf, and add2.make. #!N #!N #!F-adobe-times-bold-r-normal--18* (6) IMPLEMENT THE ADD2 FUNCTION. #!EF Use an editor to add the following lines after "User's code goes here," ________________________________________ near the end of the add2.c file: #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N int i; #!N #!N /* first check that the lengths of the data buffers match */ #!N if (field1_knt != field2_knt) { #!N DXSetError(ERROR_INVALID_DATA,"data components do not match"); #!N return 0; #!N } #!N #!N for (i=0; i < field1_knt; i++) #!N result_data[i] = field1_data[i] + field2_data[i]; #!N #!N return 1; #!N } #!EF #!N #!N #!EC #!N #!N The file /usr/lpp/dx/samples/program_guide/add2.c contains a completed version of this program. #!N #!N #!F-adobe-times-bold-r-normal--18* (7) TO CREATE A VERSION OF DATA EXPLORER THAT INCLUDES #!EF the Add2 module, enter the command: ____________________________________________________________ #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N make -f add2.make dxexec #!EF #!N #!N #!EC #!N #!N (You have now created an executable that contains the Add2 module.) #!N #!N #!F-adobe-times-bold-r-normal--18* (8) TO INVOKE THIS VERSION, ENTER: #!EF _________________________________________ #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N dx -edit -mdf ./add2.mdf -exec ./dxexec #!EF #!N #!N #!EC #!N #!N This command starts Data Explorer (the #!F-adobe-times-bold-r-normal--18* add2.mdf #!EF file tells the graphical user interface about Add2 and its inputs and outputs). The executable dxexec invoked here is the one created in Step 6. #!N #!N #!F-adobe-times-bold-r-normal--18* (9) WITH THIS VERSION OF DATA EXPLORER #!EF you can now run any visual program that uses the Add2 module. One ____________________________________________ such program is /usr/lpp/dx/samples/program_guide/add2.net #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ladd2i,dxall1030 h Add2Invalid Module Example--Manipulate Invalid Data #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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