File Handling

Write to file

The command WRITE/ is used to write and store data in an open file.
$$ Example of Write Command


DECL/CHAR,50,filnm,elnm


DECL/INTGR,i


DECL/DOUBLE,xx,yy,zz


TEXT/QUERY,(filnm),50,A,L,'insert file name'


filnm=ASSIGN/CONCAT('C:\',filnm,'.TXT')


DID(F1)=DEVICE/STOR,filnm


$$ This is to create some dummy points.


F(POI_1)=FEAT/POINT,CART, 1.111,2.222,3.333, 0,0,0


F(POI_2)=FEAT/POINT,CART, 4.444,5.555,6.666, 0,0,0


F(POI_3)=FEAT/POINT,CART, 7.777,8.888,9.999, 0,0,0


FA(POI_1)=FEAT/POINT,CART, 1.111,2.222,3.333, 0,0,0


FA(POI_2)=FEAT/POINT,CART, 4.444,5.555,6.666, 0,0,0


FA(POI_3)=FEAT/POINT,CART, 7.777,8.888,9.999, 0,0,0


$$ This row opens the file as an output device.


OPEN/DID(F1),DIRECT,OUTPUT,OVERWR


DO/i,1,3


$$ Get the values from points


elnm=ASSIGN/CONCAT('poi_',STR(i))


xx=OBTAIN/FA(@elnm),3


yy=OBTAIN/FA(@elnm),4


zz=OBTAIN/FA(@elnm),5


$$ Write command writes in the output file the required values


WRITE/DID(F1),xx


WRITE/DID(F1),yy


WRITE/DID(F1),zz


ENDDO


CLOSE/DID(F1)


Read from file

The command READ/ is used to get a value from an open file.

$$ Example of Read command


DECL/CHAR,50,filnm, result


DECL/CHAR,50,xyz


DECL/DOUBLE,xx,yy,zz


TEXT/QUERY,(filnm),50,A,L,'insert file name'


filnm=ASSIGN/CONCAT('C:\',filnm,'.TXT')


DID(F1)=DEVICE/STOR,filnm


$$ This row opens the file as an input device.


OPEN/DID(F1),DIRECT,INPUT


$$ Read command reads values from the input file and declare a point


READ/DID(F1),xx


READ/DID(F1),yy


READ/DID(F1),zz


F(POI_10)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


FA(POI_10)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


$$ Read command reads values from the input file and declare a point


READ/DID(F1),xx


READ/DID(F1),yy


READ/DID(F1),zz


F(POI_20)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


FA(POI_20)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


$$ Read command reads values from the input file and declare a point


READ/DID(F1),xx


READ/DID(F1),yy


READ/DID(F1),zz


F(POI_30)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


FA(POI_30)=FEAT/POINT,CART, xx,yy,zz, 0,0,0


result=ASSIGN/CONCAT(STR(xx),' , ',STR(yy),' , ',STR(zz))


TEXT/OPER,result


CLOSE/DID(F1)