wlzard
17th May 2004 13:08 UTC

Reading from a file
I'm having trouble reading from a file. I need to read a string from a file and then set it to a text field. I have no problems doing the text field but reading the file is causing me serious problems.

Here is a small section of the file I need to read:

"SteamAppData"
{
"RememberPassword" "1"
"AutoLoginUser" "anaddress@somewhere.com"
"anotheraddress@nowhere.com"
{
"User" "anaddress@somewhere.com"
"AccountCreated" "1"
"ShowNotifyTrayHintDialog" "0"
"ShowExitDialog" "1"
"ShowExitLogoutDialog" "1"

I need to read the "AutoLoginUser" line. i.e I need to set "anaddress@somewhere.com" to a variable.

Any help would be greatly appreciated.


Thanks for reading.

wlzard
19th May 2004 07:48 UTC

Was my question too hard? Did I not give enough info? Or has it been answered else where?

Joost Verburg
19th May 2004 10:02 UTC

You can use FileOpen to open the file for reading. Then you can read every line using FileRead.

If it's a line you don't want to change (check the line using string function like StrCmp and Cpy), add the line to a variable, otherwise add the changed value.

Then close the file, open it for writing and write everything back.

wlzard
19th May 2004 14:00 UTC

Thanks for the help

I do not wish to modify the file at all, just open, read, and close.

However how do I capture one part of the line. Is there a StringTokenizer or anything like that I need to use?

Joost Verburg
19th May 2004 16:19 UTC

That's even easier. There is a StrTok function available in the StrFunc header file.

wlzard
20th May 2004 09:30 UTC

thanks, great help

wlzard
20th May 2004 11:17 UTC

Sorry to be a pain but the StrFunc wont work. I've done

!include "StrFunc.nsh"

But when I try to use any of the methods it just gives me errors. I even went as far as using the examples and they still don't work.

Section

${StrStr} $3 "This is just an example" "just"

SectionEnd

I get this error:
Section: ""
!insertmacro: FUNCTION_STRING_StrStr
!insertmacro: macro "FUNCTION_STRING_StrStr" requires 0 parameter(s), passed 3!
Error in script "stdin" on line 99 -- aborting creation process


What am I doing wrong?

wlzard
20th May 2004 11:38 UTC

I apologize for the tripple post but I've come up with a different way of doing it (since I couldn't get StrFunc working. I did the following:

FileOpen $1 $INSTDIR\config\SteamAppData.vdf r
FileRead $1 $2
FileRead $1 $2
FileRead $1 $2
FileRead $1 $2

StrCpy $7 $2 80 19

FileClose $1

It almost works. $7 = anaddress@somewhere.com"

but I need the " to be taken of the end. Is this possible? Or is it still better to use StrFunc?

Joost Verburg
20th May 2004 12:12 UTC

They work fine, you only have to initialize them first (see StrFunc.txt).

You can trim a trailing character using StrLen and StrCpy.

wlzard
20th May 2004 12:21 UTC

Oops I forgot to initialize them. Thanks for that I'll remember it for next time.

However in the mean time I worked something else out. It might not be elegant but it works

FileOpen $1 $INSTDIR\config\SteamAppData.vdf r
FileRead $1 $2
FileRead $1 $2
FileRead $1 $2
FileRead $1 $2

StrCpy $7 $2 80 19

loop:
IntOp $8 $8 + 1
StrCpy $9 $7 $8
StrCmp $7 $9 trimIt loop

trimIt:
IntOp $8 $8 - 2
StrCpy $6 $7 $8

FileClose $1


Thanks for all your help