Printable View
Ok, so I decided to go back and use some QBasic just for the sake of some retro programing fun. :D
I know in VB6 if you want to check for a file you can use the Dir or Dir$ command. For example:
But QBasic doesn't have Dir or Dir$. So what is the equivalent QBasic command?Code:dim FileName as string
FileName = "MyFile.txt"
if dir(FileName) <> "" then
print "File exists."
else
print "File is missing."
end if
Thread moved from 'VB6 and Earlier' forum (which is only meant for VB) to the 'Other BASIC' forum
Why does it seem nobody knows the answer to this?
i don't if there is
a quick search in google, i found this : http://social.msdn.microsoft.com/For...8-fdb33e324ac0
BTW: if you are after good basic interpreter, take a look at this: wxBasic.net
can run on several platforms
Thanks but I'm not looking to generate a txt file directory listing. I'm looking for the QBasic equivalent of the VB6 command "Dir" or "Dir$". The Dir command in VB6 is a function which when a file name is put into it, its return value is a string containing nothing if the file isn't there, and the name of the file if it is there. It returns it meaning it can be DIRECTLY put into a variable so I can have like:Quote:
Originally Posted by whatsup
What you have showed me does NOT return a value to QBasic, but rather simply executes the dos command "Dir". I already tried this:Code:dim TestStr as string
TestStr = dir("myfile.dat")
But that didn't work.Code:dim TestStr as string
TestStr = shell dir("myfile.dat")
I'm going on the assumption that Dir and Dir$ in VB6 are direct ports of a QBasic command with a similar name (such as DirFind, Find, FileFind, or something like that). But I can't find any QBasic documentation on the internet that names the QBasic equivalent of VB6's Dir and Dir$. But I'm sure such a command exists. Please help me.
VB6 isn't actually descended from QBasic.
QBasic was a fork from an early version of QuickBasic (4.5), meant as a replacement for GW-Basic. It pretty much stagnated where it was. VB took another path, going through Basic Professional Development System (PDS).
VBDOS 1.0 was actually a later version of PDS, and came out just after VB 1.0 for Windows. VBDOS does have Dir$.
Examples of Loading MS-DOS Directory Listing into an ArrayQuote:
The DIR$ functions was introduced in Microsoft Basic PDS for MS-DOS and MS OS/2, version 7.0.
Quote:
Originally Posted by dilettante
But does QBasic have an EQUIVALENT command for Dir$?
And what is the difference between QBasic and QuickBasic? I thought they were the same, with the "Q" in QBasic being short for the word "Quick".
No there is no Dir$() or equivalent in QBasic.
QBasic was a stripped down version of an old QuickBasic without a compiler and linker. You are left with the IDE and interpreter, so programs cannot be compiled and thus run much more slowly than compiled QuickBasic programs.
QuickBasic had no Dir$() either.
You might be interested in this link.Quote:
Originally Posted by Ben321
Let's see,
If you want to do the following things in Qbasic:
-Check whether a file exists:
If the specified file doesn't exist this will cause an error upon execution, which you probably want to cath using the ON ERROR statement.Code:OPEN path FOR INPUT AS #n: CLOSE #n
-Display a list of files in a directory:
Though limited in what it can do, the FILES statement might still be useful to you.Code:FILES "pattern"
-Write the contents of a directory to a file, which can then be read by your Qbasic program:
Hope this helps.Code:SHELL "DIR path /B>file"