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flat assembler > Windows > importing stdin

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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
That and you need cinvoke... It's not a problem as long as it's documented, but if it isn't you get problems, which is why we need more examples of things in fasm. I've noticed there are alot of functions out there that aren't documented, but are used in examples throughout the web. We have them on our computer, but no-one knows anything about them. Compared to MASM, fasm is pretty darn low level, problem is just about everything in ASM is for MASM. Everything in MASM is a big mystery, which is what i like about FASM. Nothing's hidden.
Post 03 Jun 2007, 18:06
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7109
Location: Slovakia
Quote:
I've noticed there are alot of functions out there that aren't documented, but are used in examples throughout the web

like what? you mean MASM32 "library" functions?
Post 03 Jun 2007, 19:13
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
auxDIBImageLoad() is one of the functions that's not documented anywhere. MSDN has nothing on it. Where's it located? Luckily, that one has enough examples to find out what the input and return is, but while looking it up i noticed that there's a joke going around that the aux functions could be calling mars for all we know. After noticing this, i realized that there are probably more functions in windows that really aren't documented well. And then there's always the problem of a lack of warning. Some functions don't work without another one being called first or one being called after it, and documentation dosn't warn you about it. Which is why i like assembly, you don't just take code and say "welp, it works, so i'll put it into a library then some idiot can use it even if he dosn't know what's going on." I feel for resons like this, examples in fasm not only just help fasm programmers, but programmers for all assemblers and programming languages, so they have a better understanding of what's needed, and what was placed there because it worked in some one's example. That's what i loath about HLLs, but this is off topic and for another discussion...
Post 03 Jun 2007, 19:29
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4634
Location: Argentina
Maybe because it is not an API at all? By dissasembling a NeHe tutorial you will figure out that that function is linked statically.
Post 03 Jun 2007, 19:54
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
I've never looked around though compiled exes much, but i have a theory that just about everything is linked statically when it goes through a compiler.
Post 03 Jun 2007, 21:07
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7109
Location: Slovakia
yes, it's a openGL function, no reason be on MSDN.

Quote:
I've never looked around though compiled exes much, but i have a theory that just about everything is linked statically when it goes through a compiler.

depends on how you define "going through compiler" Very Happy
Post 03 Jun 2007, 21:28
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
MSDN, for some odd resons, lists other opengl functions. Don't know why it'd be excluded.

As for how i define compiler, i mean being thrown through something like visual studio's massive collection of programs that do alot of things that are a major mystery to us.
Post 03 Jun 2007, 21:34
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4634
Location: Argentina
But the documented OGL functions comes with Windows while the glaux auxDIBImageLoad function don't, you need to get the .lib file and link to it. Here you have some info about glaux http://members.cox.net/scottheiman/opengl.htm
Post 03 Jun 2007, 22:17
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7109
Location: Slovakia
Quote:
As for how i define compiler, i mean being thrown through something like visual studio's massive collection of programs that do alot of things that are a major mystery to us.

not to me Wink

you are not right then. for example all DLL stuff is linked dynamically.
Post 03 Jun 2007, 22:33
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
Then what *IS* all that junk being thrown into a program using cout << that compiles to 256kb? XD
Post 03 Jun 2007, 22:42
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moveax41h



Joined: 18 Feb 2018
Posts: 47
How do you do this on Linux?
Post 23 Jul 2018, 16:20
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fasmnewbie



Joined: 01 Mar 2011
Posts: 547
It's pretty straightforward if you are familiar around the use of file descriptor

1. Just get a file descriptor ("theFile.txt","r") from an opened file.
2. Feed RAX (the return value, FD) into FILE *stream argument

The rest is quite straightforward I think (buffer, size). You can use printf to print the content the returned buffer. Don't forget to close the FD using fclose(fd).

Here's something similar on Win64, different calling convention of course
Code:
; gcc -m64 this.obj -o this.exe
        format MS64 COFF
        public main
        
        extrn fgets
        extrn fopen
        extrn fclose
        extrn printf

        section '.data' writeable
stream  db 'theFile.txt',0   ;put some text in here
mode    db 'r',0
strs    rb 1000             ;save buffer 1000 bytes

        section '.text' executable
main:
        sub     rsp,40

        mov     rdx,mode
        mov     rcx,stream
        call    fopen
        mov     r15,rax     ;save file handle
                        
        mov     r8,rax       ;FILE stream
        mov     rdx,500     ;int n. read first 500 characters
        mov     rcx,strs     ;char *str
        call    fgets   
                
        mov     rcx,r15     ;close file handle
        call    fclose
        
        mov     rcx,strs
        call    printf
                
        add     rsp,40
        ret    
Post 23 Jul 2018, 20:36
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fasmnewbie



Joined: 01 Mar 2011
Posts: 547
I wasn't aware that this is an 11 year old thread.

Never mind, at least it finally wakes up to a 64-bit code!

How time flies...
Post 23 Jul 2018, 20:58
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16149
Location: Hyperborea
fasmnewbie wrote:
I wasn't aware that this is an 11 year old thread.
Old threads still contain useful information. So no problem, it can be updated as needed.
Post 23 Jul 2018, 21:16
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