Text file manipulation?
BlitzMax Forums/BlitzMax Programming/Text file manipulation?
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| I am at the point in my game were I want to save and load data about rooms, items, and graphics to a text file. I could learn to use one of the xml modules for this, but would like to make a system of my own. Trouble is I haven't been able to find enough info on how to use the built in file reading/writing commands to do what I want. There's a lot of code snippets and posts about simple text stuff, but noone has done anything on what each command does and how to integrate a system for loading data into a game. I need to understand the way it works before I can workout how to apply it to my game. Does anyone have a link to a tutorial on this subject or will info from older blitz3d stuff be the same as most of the syntax seams unchanged with the text/string stuff. Any pointers would be great. |
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| double post Last edited 2011 |
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| it is pretty basic to access the file for reading/writting: local file:Tstream = OpenStream(filename) 'opes the file for reading or writting to read the data from a text file:
local file:Tstream = openStream("myfile.txt")
if file<> null ' if the file was found
while not eof(file)
local str$ = ReadLine(file) ' reads a line from the file
print str ' prints the read string
wend
endif
to read from a binary file:
local file:Tstream = openStream("myfile.data")
if file <> null
local b:int = file.ReadByte() ' the variable can be different
local c:int = file.ReadShort()'
local d:int = file.ReadInt()
local e:string = file.ReadString(n) ' reads n number of bytes return(chr 13) counts but ignored
endif
or:
local file:Tstream = openStream("myfile.data")
if file <> null
while not eof(file)
local b:int = file.ReadByte()
wend
endif
the same principle for writing to a file just use: file.WriteString(string) file.WriteInt(int) file.writeByte(byte) to open a stream for reading only: local file:Tstream = ReadStream(fileName) for writting only: local file:Tstream = WriteStream(fileName) to get the file pointer position: local n:int = file.pos() to move the file pointer to a certain location to start reading or writing from that location:
if file.seek(n) <> -1
print "success"
endif
I used methods but if you want to use functions just look them up. it's the same principle. Last edited 2011 Last edited 2011 |
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| For reading text based data files I like to use a simple INI-style syntax with identifier=value on each line. I also like to read the data back in any order as there's nothing worse than having to edit all your text-based levels because you added a new parameter. This simple type loads a text file into a TMap and you can retrieve the values directly using the identifier. Sample text file contents.. number=3.1415 name=Mr Magoo id=24 For "data" lines I use; "data1=00100101010101010101", "data2=", "data3=" etc then it's easy to loop through the lines. NB The above code is case sensitive and not very whitespace friendly but you'll get the idea. Cheers Matt |
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| Thanks guys. that helps, I will have another go, I think its a bit clearer now. Did you guys pick this up from the blitzmax help? or is it the same in blitz3d? without the oop stuff Last edited 2011 |
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| all of the none none OOP and OOP commands are on the IDE on the right window under: home->streams->streams Last edited 2011 |
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| this isnt prety its my encryption program I did it very quicky so dont expect perfect code, but if you look through it, you will see how you put all your variables into an array. Open a stream to output, then loop through your array putting each variable into the stream. then close the stream. do the reverse to load. 'reader Manual code below Writer code at the end of reader code Graphics 1024,768,32,60 Global store[4081*20] Global page = 0 Global psy = 0 Global gfx = 20 Global ok = 1 Global sline = 0 Global ssave = LoadImage(".\grafix\back.PNG",flags=ALPHABITS ) Global lload = LoadImage(".\grafix\forward.PNG",flags=ALPHABITS ) Global pics = LoadAnimImage(".\userstuff\pics.PNG",350,695,0,gfx,flags=ALPHABITS ) savedit = ReadStream( ".\userstuff\encryptedtext.txt" ) While Not KeyHit(KEY_ESCAPE) Cls DrawText "Use UP & DOWN Cursor keys or -", 670,715 DrawText "Forward & Back for fast scroll", 670,729 DrawText "Programed By Mark Ainsworth 210665", 670,745 If KeyHit(KEY_UP) Then sline = sline - 66 If KeyHit(KEY_DOWN) Then sline = sline + 66 If sline > (4080*20)-67 Then sline = 4079*20-66 DrawImage( ssave ,909+48,705,frame=1 ) DrawImage( lload ,909+48,736,frame=1 ) If MouseDown(1) And MouseX() > 957 And MouseX() < 957+45 And MouseY() > 705 And MouseY() < 735 #qwbnms If MouseDown(1) Then Goto qwbnms page = page - 1 If page < 0 Then page = 0 ok = 1 sline = 0 EndIf If MouseDown(1) And MouseX() > 957 And MouseX() < 957+45 And MouseY() > 736 And MouseY() < 765 #dqwbnms If MouseDown(1) Then Goto dqwbnms page = page + 1 If page > 19 Then page = 19 ok = 1 sline = 0 EndIf If ok = 1 If Not savedit Goto nofile EndIf bt = 0 crypta = 0 crypta2 = 3 For j = 0 To (19*4080) + 4079 If Not Eof(savedit) bt = ReadInt (savedit) crypta = crypta + 1 If crypta = 16 Then crypta = 0 store[j] = bt - crypta - crypta2 EndIf Next #nofile ok = 0 EndIf disppage() DrawImage( pics,670 ,0,psy ) Flip Wend CloseStream savedit End Function disppage() psy = 0 p = page * 4080 p = p + sline For v = 0 To 68 For cnt = 0 To 66 If cnt > 56 And store[p] = 84 Then store[p] = 100 If store[p] = 100 v = v + 1 If store[p] = 100 cnt = 0 If store[p] = 79 Then psy = psy + 1 'set psy maximum png files 0=1 1=2 2=3 so on If psy > 19 Then psy = 19 If store[p] = 1 Then DrawText "a", cnt*10,v*10 If store[p] = 2 Then DrawText "b", cnt*10,v*10 If store[p] = 3 Then DrawText "c", cnt*10,v*10 If store[p] = 4 Then DrawText "d", cnt*10,v*10 If store[p] = 5 Then DrawText "e", cnt*10,v*10 If store[p] = 6 Then DrawText "f", cnt*10,v*10 If store[p] = 7 Then DrawText "g", cnt*10,v*10 If store[p] = 8 Then DrawText "h", cnt*10,v*10 If store[p] = 9 Then DrawText "i", cnt*10,v*10 If store[p] = 10 Then DrawText "j", cnt*10,v*10 If store[p] = 11 Then DrawText "k", cnt*10,v*10 If store[p] = 12 Then DrawText "l", cnt*10,v*10 If store[p] = 13 Then DrawText "m", cnt*10,v*10 If store[p] = 14 Then DrawText "n", cnt*10,v*10 If store[p] = 15 Then DrawText "o", cnt*10,v*10 If store[p] = 16 Then DrawText "p", cnt*10,v*10 If store[p] = 17 Then DrawText "q", cnt*10,v*10 If store[p] = 18 Then DrawText "r", cnt*10,v*10 If store[p] = 19 Then DrawText "s", cnt*10,v*10 If store[p] = 20 Then DrawText "t", cnt*10,v*10 If store[p] = 21 Then DrawText "u", cnt*10,v*10 If store[p] = 22 Then DrawText "v", cnt*10,v*10 If store[p] = 23 Then DrawText "w", cnt*10,v*10 If store[p] = 24 Then DrawText "x", cnt*10,v*10 If store[p] = 25 Then DrawText "y", cnt*10,v*10 If store[p] = 26 Then DrawText "z", cnt*10,v*10 If store[p] = 27 Then DrawText "A", cnt*10,v*10 If store[p] = 28 Then DrawText "B", cnt*10,v*10 If store[p] = 29 Then DrawText "C", cnt*10,v*10 If store[p] = 30 Then DrawText "D", cnt*10,v*10 If store[p] = 31 Then DrawText "E", cnt*10,v*10 If store[p] = 32 Then DrawText "F", cnt*10,v*10 If store[p] = 33 Then DrawText "G", cnt*10,v*10 If store[p] = 34 Then DrawText "H", cnt*10,v*10 If store[p] = 35 Then DrawText "I", cnt*10,v*10 If store[p] = 36 Then DrawText "J", cnt*10,v*10 If store[p] = 37 Then DrawText "K", cnt*10,v*10 If store[p] = 38 Then DrawText "L", cnt*10,v*10 If store[p] = 39 Then DrawText "M", cnt*10,v*10 If store[p] = 40 Then DrawText "N", cnt*10,v*10 If store[p] = 41 Then DrawText "O", cnt*10,v*10 If store[p] = 42 Then DrawText "P", cnt*10,v*10 If store[p] = 43 Then DrawText "Q", cnt*10,v*10 If store[p] = 44 Then DrawText "R", cnt*10,v*10 If store[p] = 45 Then DrawText "S", cnt*10,v*10 If store[p] = 46 Then DrawText "T", cnt*10,v*10 If store[p] = 47 Then DrawText "U", cnt*10,v*10 If store[p] = 48 Then DrawText "V", cnt*10,v*10 If store[p] = 49 Then DrawText "W", cnt*10,v*10 If store[p] = 50 Then DrawText "X", cnt*10,v*10 If store[p] = 51 Then DrawText "Y", cnt*10,v*10 If store[p] = 52 Then DrawText "Z", cnt*10,v*10 If store[p] = 53 Then DrawText "0", cnt*10,v*10 If store[p] = 54 Then DrawText "1", cnt*10,v*10 If store[p] = 55 Then DrawText "2", cnt*10,v*10 If store[p] = 56 Then DrawText "3", cnt*10,v*10 If store[p] = 57 Then DrawText "4", cnt*10,v*10 If store[p] = 58 Then DrawText "5", cnt*10,v*10 If store[p] = 59 Then DrawText "6", cnt*10,v*10 If store[p] = 60 Then DrawText "7", cnt*10,v*10 If store[p] = 61 Then DrawText "8", cnt*10,v*10 If store[p] = 62 Then DrawText "9", cnt*10,v*10 If store[p] = 63 Then DrawText "10", cnt*10,v*10 If store[p] = 64 Then DrawText "-", cnt*10,v*10 If store[p] = 65 Then DrawText "=", cnt*10,v*10 If store[p] = 66 Then DrawText "<", cnt*10,v*10 If store[p] = 67 Then DrawText ">", cnt*10,v*10 If store[p] = 68 Then DrawText ".", cnt*10,v*10 If store[p] = 69 Then DrawText ",", cnt*10,v*10 If store[p] = 70 Then DrawText "(", cnt*10,v*10 If store[p] = 71 Then DrawText ")", cnt*10,v*10 If store[p] = 72 Then DrawText "[", cnt*10,v*10 If store[p] = 73 Then DrawText "]", cnt*10,v*10 If store[p] = 74 Then DrawText "+", cnt*10,v*10 If store[p] = 75 Then DrawText "&", cnt*10,v*10 If store[p] = 76 Then DrawText "#", cnt*10,v*10 If store[p] = 77 Then DrawText ";", cnt*10,v*10 If store[p] = 78 Then DrawText ":", cnt*10,v*10 If store[p] = 79 Then DrawText "@", cnt*10,v*10 If store[p] = 80 Then DrawText "?", cnt*10,v*10 If store[p] = 81 Then DrawText "_", cnt*10,v*10 If store[p] = 82 Then DrawText "%", cnt*10,v*10 If store[p] = 83 Then DrawText "!", cnt*10,v*10 If store[p] = 84 Then DrawText " ", cnt*10,v*10 'If store[p] = 200 Then DrawText "\n", cnt*10,v*10 If store[p] = 0 Then DrawText " ", cnt*10,v*10 If v > 68 cnt = 66 v = 68 EndIf p = p + 1 If p > (4080*20)-1 Then p = 4079*20 'If p > 4079 Then p = p - 1 Next Next End Function 'writer Manual Graphics 1024,768,32,60 Global store[4081*20] Global btg = 0 Global page = 0 Global p = 0 Global psy = 0 Global gfx = 20 While Not KeyHit(KEY_ESCAPE) Cls DrawText "Programed By Mark Ainsworth 210665", 670,745 #dqwbnms savedit = ReadStream( ".\userstuff\unencryptedtext.txt" ) If Not savedit Goto nofile EndIf bt = 0 bt2 = 0 crypta = 0 crypta2 = 3 For jh = 0 To 19 For j = 0 To 4079 If Not Eof(savedit) Then bt2 = ReadByte (savedit) bt = bt2 btg = 0 If bt = 97 Then btg = 1 If bt = 98 Then btg = 2 If bt = 99 Then btg = 3 If bt = 100 Then btg = 4 If bt = 101 Then btg = 5 If bt = 102 Then btg = 6 If bt = 103 Then btg = 7 If bt = 104 Then btg = 8 If bt = 105 Then btg = 9 If bt = 106 Then btg = 10 If bt = 107 Then btg = 11 If bt = 108 Then btg = 12 If bt = 109 Then btg = 13 If bt = 110 Then btg = 14 If bt = 111 Then btg = 15 If bt = 112 Then btg = 16 If bt = 113 Then btg = 17 If bt = 114 Then btg = 18 If bt = 115 Then btg = 19 If bt = 116 Then btg = 20 If bt = 117 Then btg = 21 If bt = 118 Then btg = 22 If bt = 119 Then btg = 23 If bt = 120 Then btg = 24 If bt = 121 Then btg = 25 If bt = 122 Then btg = 26 If bt = 65 Then btg = 27 If bt = 66 Then btg = 28 If bt = 67 Then btg = 29 If bt = 68 Then btg = 30 If bt = 69 Then btg = 31 If bt = 70 Then btg = 32 If bt = 71 Then btg = 33 If bt = 72 Then btg = 34 If bt = 73 Then btg = 35 If bt = 74 Then btg = 36 If bt = 75 Then btg = 37 If bt = 76 Then btg = 38 If bt = 77 Then btg = 39 If bt = 78 Then btg = 40 If bt = 79 Then btg = 41 If bt = 80 Then btg = 42 If bt = 81 Then btg = 43 If bt = 82 Then btg = 44 If bt = 83 Then btg = 45 If bt = 84 Then btg = 46 If bt = 85 Then btg = 47 If bt = 86 Then btg = 48 If bt = 87 Then btg = 49 If bt = 88 Then btg = 50 If bt = 89 Then btg = 51 If bt = 90 Then btg = 52 If bt = 48 Then btg = 53 If bt = 49 Then btg = 54 If bt = 50 Then btg = 55 If bt = 51 Then btg = 56 If bt = 52 Then btg = 57 If bt = 53 Then btg = 58 If bt = 54 Then btg = 59 If bt = 55 Then btg = 60 If bt = 56 Then btg = 61 If bt = 57 Then btg = 62 If bt = 58 Then btg = 63 If bt = 45 Then btg = 64 If bt = 61 Then btg = 65 If bt = 60 Then btg = 66 If bt = 62 Then btg = 67 If bt = 46 Then btg = 68 If bt = 44 Then btg = 69 If bt = 40 Then btg = 70 If bt = 41 Then btg = 71 If bt = 91 Then btg = 72 If bt = 93 Then btg = 73 If bt = 43 Then btg = 74 If bt = 38 Then btg = 75 If bt = 35 Then btg = 76 If bt = 59 Then btg = 77 If bt = 58 Then btg = 78 If bt = 64 Then btg = 79 If bt = 63 Then btg = 80 If bt = 95 Then btg = 81 If bt = 37 Then btg = 82 If bt = 33 Then btg = 83 If bt = 32 Then btg = 84 If bt = 13 Then btg = 100 bt = btg If bt > 0 And bt < 85 store[j+(jh*4080)] = bt If bt = 100 store[j+(jh*4080)] = bt Next Next CloseStream savedit #nofile #qwbnms savedit = WriteStream( ".\userstuff\encryptedtext.txt" ) If Not savedit Goto nofile2 EndIf bt = 0 crypta = 0 crypta2 = 3 For kl = 0 To 19 For j = 0 To 4079 bt = store[j+(kl*4080)] crypta = crypta + 1 If crypta = 16 Then crypta = 0 bt = bt + crypta + crypta2 WriteInt (savedit, bt) Next Next FlushStream(savedit) CloseStream savedit #nofile2 DrawText "Press Escape Manual has been created", 10,10 Flip Wend Function disppage() p = page * 4080 For v = 0 To 68 For cnt = 0 To 60 If store[p] = 90 v = v + 1 If store[p] = 90 cnt = 0 If store[p] = 1 Then DrawText "a", cnt*10,v*10 If store[p] = 2 Then DrawText "b", cnt*10,v*10 If store[p] = 3 Then DrawText "c", cnt*10,v*10 If store[p] = 4 Then DrawText "d", cnt*10,v*10 If store[p] = 5 Then DrawText "e", cnt*10,v*10 If store[p] = 6 Then DrawText "f", cnt*10,v*10 If store[p] = 7 Then DrawText "g", cnt*10,v*10 If store[p] = 8 Then DrawText "h", cnt*10,v*10 If store[p] = 9 Then DrawText "i", cnt*10,v*10 If store[p] = 10 Then DrawText "j", cnt*10,v*10 If store[p] = 11 Then DrawText "k", cnt*10,v*10 If store[p] = 12 Then DrawText "l", cnt*10,v*10 If store[p] = 13 Then DrawText "m", cnt*10,v*10 If store[p] = 14 Then DrawText "n", cnt*10,v*10 If store[p] = 15 Then DrawText "o", cnt*10,v*10 If store[p] = 16 Then DrawText "p", cnt*10,v*10 If store[p] = 17 Then DrawText "q", cnt*10,v*10 If store[p] = 18 Then DrawText "r", cnt*10,v*10 If store[p] = 19 Then DrawText "s", cnt*10,v*10 If store[p] = 20 Then DrawText "t", cnt*10,v*10 If store[p] = 21 Then DrawText "u", cnt*10,v*10 If store[p] = 22 Then DrawText "v", cnt*10,v*10 If store[p] = 23 Then DrawText "w", cnt*10,v*10 If store[p] = 24 Then DrawText "x", cnt*10,v*10 If store[p] = 25 Then DrawText "y", cnt*10,v*10 If store[p] = 26 Then DrawText "z", cnt*10,v*10 If store[p] = 27 Then DrawText "A", cnt*10,v*10 If store[p] = 28 Then DrawText "B", cnt*10,v*10 If store[p] = 29 Then DrawText "C", cnt*10,v*10 If store[p] = 30 Then DrawText "D", cnt*10,v*10 If store[p] = 31 Then DrawText "E", cnt*10,v*10 If store[p] = 32 Then DrawText "F", cnt*10,v*10 If store[p] = 33 Then DrawText "G", cnt*10,v*10 If store[p] = 34 Then DrawText "H", cnt*10,v*10 If store[p] = 35 Then DrawText "I", cnt*10,v*10 If store[p] = 36 Then DrawText "J", cnt*10,v*10 If store[p] = 37 Then DrawText "K", cnt*10,v*10 If store[p] = 38 Then DrawText "L", cnt*10,v*10 If store[p] = 39 Then DrawText "M", cnt*10,v*10 If store[p] = 40 Then DrawText "N", cnt*10,v*10 If store[p] = 41 Then DrawText "O", cnt*10,v*10 If store[p] = 42 Then DrawText "P", cnt*10,v*10 If store[p] = 43 Then DrawText "Q", cnt*10,v*10 If store[p] = 44 Then DrawText "R", cnt*10,v*10 If store[p] = 45 Then DrawText "S", cnt*10,v*10 If store[p] = 46 Then DrawText "T", cnt*10,v*10 If store[p] = 47 Then DrawText "U", cnt*10,v*10 If store[p] = 48 Then DrawText "V", cnt*10,v*10 If store[p] = 49 Then DrawText "W", cnt*10,v*10 If store[p] = 50 Then DrawText "X", cnt*10,v*10 If store[p] = 51 Then DrawText "Y", cnt*10,v*10 If store[p] = 52 Then DrawText "Z", cnt*10,v*10 If store[p] = 53 Then DrawText "0", cnt*10,v*10 If store[p] = 54 Then DrawText "1", cnt*10,v*10 If store[p] = 55 Then DrawText "2", cnt*10,v*10 If store[p] = 56 Then DrawText "3", cnt*10,v*10 If store[p] = 57 Then DrawText "4", cnt*10,v*10 If store[p] = 58 Then DrawText "5", cnt*10,v*10 If store[p] = 59 Then DrawText "6", cnt*10,v*10 If store[p] = 60 Then DrawText "7", cnt*10,v*10 If store[p] = 61 Then DrawText "8", cnt*10,v*10 If store[p] = 62 Then DrawText "9", cnt*10,v*10 If store[p] = 63 Then DrawText "10", cnt*10,v*10 If store[p] = 64 Then DrawText "-", cnt*10,v*10 If store[p] = 65 Then DrawText "=", cnt*10,v*10 If store[p] = 66 Then DrawText "<", cnt*10,v*10 If store[p] = 67 Then DrawText ">", cnt*10,v*10 If store[p] = 68 Then DrawText ".", cnt*10,v*10 If store[p] = 69 Then DrawText ",", cnt*10,v*10 If store[p] = 70 Then DrawText "(", cnt*10,v*10 If store[p] = 71 Then DrawText ")", cnt*10,v*10 If store[p] = 72 Then DrawText "[", cnt*10,v*10 If store[p] = 73 Then DrawText "]", cnt*10,v*10 If store[p] = 74 Then DrawText "+", cnt*10,v*10 If store[p] = 75 Then DrawText "&", cnt*10,v*10 If store[p] = 76 Then DrawText "#", cnt*10,v*10 If store[p] = 77 Then DrawText ";", cnt*10,v*10 If store[p] = 78 Then DrawText ":", cnt*10,v*10 If store[p] = 79 Then DrawText "@", cnt*10,v*10 If store[p] = 80 Then DrawText "?", cnt*10,v*10 If store[p] = 81 Then DrawText "_", cnt*10,v*10 If store[p] = 82 Then DrawText "%", cnt*10,v*10 If store[p] = 83 Then DrawText "!", cnt*10,v*10 If store[p] = 84 Then DrawText " ", cnt*10,v*10 If store[p] = 0 Then DrawText " ", cnt*10,v*10 p = p + 1 If p > 4079 Then p = p - 1 Next Next End Function End |
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| @Mainsworthy: http://www.blitzbasic.com/faq/faq_entry.php?id=2 |
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| Thanks very interesting. :O) |
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