One Question?

[trodon]

Code Select Expand

.386
.model flat,stdcall
option casemap:none

include \masm32\include\windows.inc ;*
include     demo.imp

includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\user32.lib
includelib \masm32\lib\msvcrt.lib

cinvoke EQU <invoke> ;* The scanner skips a line when it detects the symbols ;*

.data
template        db  'Computer name : %s',0
caption         db  'Hello',0
nSize           dd  MAX_COMPUTERNAME_LENGTH+1
.data?
temp            db  256 dup(?)
computername    db  MAX_COMPUTERNAME_LENGTH+1 dup(?)

.code

start:

    invoke  GetComputerName,ADDR computername,ADDR nSize
    cinvoke sprintf,ADDR temp,ADDR template,ADDR computername ; The scanner should be instructed
                                                              ; with the cinvoke statement
                                                              ; to process C functions
                                                             
    invoke  MessageBox,0,ADDR temp,ADDR caption,MB_ICONINFORMATION
    invoke  ExitProcess,0
   
END start

This one is example from External Scanner for Fasm by vortex,

Code Select Expand

template        db  'Computer name : %s',0
so, when i change this s to something else msg does show my computer name, its only work with s.
whats is this s exactly? and how you know that you need to put s?

[Ehtyar]

MSDN is your friend...
From the MSDN article on sprintf:

The sprintf function formats and stores a series of characters and values in buffer. Each argument (if any) is converted and output according to the corresponding format specification in format. The format consists of ordinary characters and has the same form and function as the format argument for printf.

And the format specifications for the printf function family can be found here, it is linked to from the MSDN article on sprintf.

Hope this helps, Ehtyar.

[edit]
Most coders will use wsprintfA instead, as it is exported from user32 and will not require you to link directly to the crt.
[/edit]