hello everyone, i have a problem when i want to call function from .lib file
asm code
.686
.model flat, stdcall
asmprint proto
.data
val1 word 123
val2 word 23
val3 word 50
val4 word 25
.code
start:
mov ax, val1
sub ax, val2
sub ax, val2
sub ax, val3
sub ax, val4
call asmprint
ret
end start
and asmprint.lib code
#include<stdio.h>
void asmprint(){
unsigned int veax;
__asm mov veax, eax
printf("%.8H\n", veax);
}
compiled by vc9.0 as static library .lib
ml /c /coff "test1.asm" --- ok
then
Link /SUBSYSTEM:CONSOLE test1.obj asmprint.lib --- error
test.obj: LMK2001: unresolved external symbol _asmprint@0
please show me my mistake
thanks.
Perhaps your C++ code needs the extern keyword:
extern void __stdcall asmprint();
...
void __stdcall asmprint(){
unsigned int veax;
__asm mov veax, eax
printf("%.8H\n", veax);
}
Just guessing, though - C++ is not my domain of expertise.
[Thanks, ToutEnMasm :U]
Quote
void asmprint(){ ....
Miss the stdcall in the c declare.In c, all prototypes are PROTO C by defaut.
extern void __stdcall asmprint();
void __stdcall asmprint(){
unsigned int veax;
__asm mov veax, eax
printf("%.8H\n", veax);
}
dont work :'(
err message no change
test.obj: LMK2001: unresolved external symbol _asmprint@0
with includelib dont working with same err msg
A proc in a library don't finish by end start
You must compile this (ml -->.obj) then build lib (lib --> .lib)
Quote
asmprint proto
.data
val1 word 123
val2 word 23
val3 word 50
val4 word 25
.code
asmprint PROC
mov ax, val1
sub ax, val2
sub ax, val2
sub ax, val3
sub ax, val4
ret
asmprint ENDP
end
I suggest that you post your code to sAve time.
I'm not sure I understand you(language barrier)
i dont want .lib file in output
i want to link test1.obj as executable with lib written in visual studio in C++
when i commented "call asmprint" the test.exe working wihout any error
Why he cant find func in the included lib?
it's a riddle ?
Post your code
no no its not a riddle. all my code I have already given in the first msg. I just want to call my func from .lib via masm
Here is what works for me:
"%ProgramFiles%\Microsoft Visual Studio 9.0\VC\bin\cl.exe" /c /Zl /Fa /Fp TestAsmC.c
\Masm32\bin\ml.exe /nologo /c /coff /Fl /Sn /Fo "TestC"
\masm32\bin\link.exe \masm32\lib\msvcrt.lib TestAsmC.obj "TestC.obj" /OUT:"TestC.exe"
#include <stdio.h>
void __stdcall asmprint();
void __stdcall asmprint(){
unsigned int veax;
__asm mov veax, eax
printf("The number is %u\nCute, isn't it?", veax);
}
.686
.model flat, stdcall
asmprint proto
.data
val1 dword 12445
val2 dword 25
val3 dword 50
val4 dword 25
.code
start:
mov eax, val1 ; 12445
sub eax, val2 ; 12420
sub eax, val3 ; 12370
sub eax, val4 ; 12345
call asmprint
ret
end start
Where is the code of the asmprint function ?
I see only the code of the execute file.No code for the lib???????
This is a test I just put together to test calling c functions from jwasm code linked with jwlink
Everything works fine using gcc to create the object files and ar to create the library.
James
c sources:
jcf17.c
int jcftest17 (void);
int jcftest17 (void)
{
int i;
i= 17;
return i;
}
jcf18.c
int jcftest18 (void);
int jcftest18 (void)
{
int i;
i= 18;
return i;
}
I was using MinGWTDM64 hence the -m32
compiled with:
gcc -c jcf17.c -m32
gcc -c jcf18.c -m32
created the library with:
ar rcs libjcflib.a jcf17.o jcf18.o
This is the jwasm asm source:
;
;+---------------------------+
;| use CRT (MSVCRT) in ASM |
;+---------------------------+
.386
.MODEL FLAT, stdcall
option casemap:none
public _start
WIN32_LEAN_AND_MEAN equ 1
include \jwasm\wininc\include\windows.inc
include \jwasm\wininc\include\stdio.inc
;my c functions
jcftest17 proto c
jcftest18 proto c
;--- CStr(): macro function to simplify defining a string
CStr macro pszText:VARARG
local szText
.const
szText db pszText,0
.code
exitm <offset szText>
endm
.data
buffer db 20 dup (0)
.data?
Argc dd ?
Argv db ?
CmdL LPSTR ?
.CODE
_start:
Mymain proc
invoke jcftest17
invoke printf,CStr("%d",10),eax
invoke jcftest18
invoke printf,CStr("%d",10),eax
ret
Mymain endp
invoke Mymain
invoke ExitProcess, NULL
end _start
And this is my batch file for compiling
@setlocal
@ECHO OFF
@SET LIB=\jwasm\wininc\lib;\jwasm\samples\jcfuller
@SET PATH=C:\jwasm;C:\jwasm\jwlink;c:\jwasm\wininc\lib;c:\jwasm\wininc;%PATH%
@REM add more libraries below
@SET LIBS=LIBRARY kernel32.lib, msvcrt.lib, libjcflib.a
jwasm %1.asm
jwlink name %1.exe file %1.obj %LIBS%
endlocal
as explain upper what is missing is the needed code for the .lib
It must be place here
Quote
; #########################################################################
.386 ; force 32 bit code
.model flat, stdcall ; memory model & calling convention
option casemap :none ; case sensitive
; -------------------------------------------------------------------
;only include files
; -------------------------------------------------------------------
include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
; include \masm32\include\gdi32.inc
; include \masm32\include\user32.inc
; include \masm32\include\kernel32.inc
; include \masm32\include\masm32.inc
; include macros.txt
; ---------------------------------------------------------
;create an include file with the prototypes
; ---------------------------------------------------------
;
;samples of extern def
; EXTERNDEF Copier :PROTO :DWORD,:DWORD
; EXTERNDEF EtatMemoirePile :MEMORY_BASIC_INFORMATION
; EXTERNDEF PoriginePile:DWORD
.data
.code
; #########################################################################
OpenRapport proc
;code here
ret
OpenRapport endp
; #########################################################################
end
Then compile it with ML
Give l this .obj to lib (made .lib) or link the execute code with the .obj
Quote from: ToutEnMasm on November 04, 2011, 09:17:54 AM
Where is the code of the asmprint function ?
I see only the code of the execute file.No code for the lib???????
Luce,
the lib code is everything that follows #include <stdio.h> in my last post above. Believe me it works perfectly :bg
All this is a little confuse.What i search is the code he want to put in a library.
I have understand this.
If he want just to maqde a c call on the asmprint fonction who is in a asm library,it's not the same thing.
Two cases,which is the good ?
How is defined asmprint ?
There is no problem to do the two things,just need to know what he want ???
If the problem is call a c program , named asmprint, the masm prog who call it must be modify
as follow:
Quote
.686
.model flat, stdcall
asmprint proto C ;<<<<<<<<<<<<<<<<<<<<<<< error,not a stdcall
.data
val1 word 123
val2 word 23
val3 word 50
val4 word 25
.code
start:
mov ax, val1
sub ax, val2
sub ax, val2
sub ax, val3
sub ax, val4
call asmprint
ret
end start
If i am not in error this look like a proto c
Quote
#include<stdio.h>
void asmprint(){
unsigned int veax;
__asm mov veax, eax
printf("%.8H\n", veax);
}
Luce,
My version works perfectly, see attachment. There is no need for PROTO C if you use stdcall in the C code, too.
By the way, Olly has massive problems with the executable.
Quote
My version works perfectly, see attachment. There is no need for PROTO C if you use stdcall in the C code, too.
The need is to use the same type of prototype ,c or stdcall or ....
Quote from: ToutEnMasm on November 04, 2011, 06:01:45 PMThe need is to use the same type of prototype ,c or stdcall or ....
What is wrong with jj's first example?
Quote from: qwe522y on November 03, 2011, 07:37:05 AM.model flat, stdcall
asmprint proto
...
Quote from: jj2007 on November 03, 2011, 08:31:39 AMextern void __stdcall asmprint();
Quote from: qWord on November 04, 2011, 06:49:33 PM
What is wrong with jj's first example?
Actually, nothing is wrong :bg
But...
Quote from: jj2007 on November 04, 2011, 08:27:54 AM
Here is what works for me:
"%ProgramFiles%\Microsoft Visual Studio 9.0\VC\bin\cl.exe" /c /Zl /Fa /Fp TestAsmC.c
\Masm32\bin\ml.exe /nologo /c /coff /Fl /Sn /Fo "TestC"
\masm32\bin\link.exe \masm32\lib\msvcrt.lib TestAsmC.obj "TestC.obj" /OUT:"TestC.exe"
... don't let the C compiler take its own crt library. You also need environment variables for the C compiler part (and for reasons I don't understand, my puter refuses to accept the global include variable ::), so I need to set it in the batch file)
Overall, mixing asm and C (or C++, even Visual Basic for apps) works just fine, and the size of the final exe is quite convincing at 1024 bytes, but it is not for noobs - finding the right setup is kind of messy.
What is wrong is,i rewrite it in bold.Quote
My version works perfectly, see attachment. There is no need for PROTO C if you use stdcall in the C code, too
With the answer:
The need is to use the same type of prototype ,c or stdcall or ....
Did you see know what is the subject ?..
Quote from: ToutEnMasm on November 05, 2011, 05:37:35 AM
With the answer:
The need is to use the same type of prototype ,c or stdcall or ....
Which is exactly what I did, so I sincerely hope that you are finally happy, Luce :bg
Good,
There is sometimes need to be more clear.Sorry, if it was writed too big. :P