Make a dynamic link library

Now the program, needless to say, are in the call of others do a good job in the dynamic link library functions, can write their own dynamic link library it? The answer is YES! Let's get started!

;-------------------------------------------------------
An example: Converts a value in Edx:eax to a decimal output form string.
; FileName: Mydll.asm, this is the source of the dynamic link library
, compilation mode = "DLL", this is the latest version of Aogo MASM for editplus requirements, only to specify the compilation mode, you can only press ctrl+1 to compile all the patterns, it is really convenient.
.386
. Model Flat,stdcall
Option Casemap:none

Include Windows.inc

. Code
;D Llentry is the portal to a dynamic-link library, which is invoked when a dynamic link library is loaded/unloaded, or when a thread of the same process is generated/exited
Of course, the function name does not have to be this, but to be consistent with the last end dllentry.
dllentry proc Hinstdll:hinstance, Reason:dword, Reserved1:dword
MOV eax,true; If you return false, the dynamic-link library will not load
Ret
Dllentry ENDP

To convert the value in Edx:eax to a decimal output form string, which is familiar, as in the previous example!
OUTEDXEAX proc \; For example: edx=0,eax=01234567h, the converted string is:
Uses ebx esi edi,lpstring; -> ' 19088743 ', 0
mov edi,lpstring; point to address where results are stored
MOV esi,lpstring

mov ecx,10; convert to Decimal
. While eax!=0 | | Edx!=0
Push EAX
MOV Eax,edx
XOR Edx,edx
div ECX
MOV ebx,eax
Pop eax
div ECX
Add DL, ' 0 '
mov [EDI],DL; Storage results
Inc EDI
MOV edx,ebx
. ENDW

mov BYTE ptr [edi],0; string ending with 0
Dec EDI

. while Edi>esi; results before changing, before changing!
MOV Al,[esi]
Xchg Al,[edi]
mov [esi],al
Inc ESI
Dec EDI
. ENDW
Ret
Outedxeax ENDP
End Dllentry
-------------------------------------------------------------------
; FileName: Mydll.def, to be saved in the same directory as Mydll.asm
A module definition file that defines a function name that can be called by another program

Library Mydll The name of the dynamic link library
Exports outedxeax; Function name that can be called
-------------------------------------------------------------------
; file name: mydll.inc, function declaration

Outedxeax PROTO:D Word; a buffer pointer parameter that holds the converted substring, noting that the buffer is sufficient to store the result.
-------------------------------------------------------------------
Compile Link:

Open the file mydll.asm with EditPlus, execute "tools \ Compile & link & Run" or use "ctrl+1" directly, as long as the program has not entered the wrong, you can see the compiled file. As follows:

D:\masm7>dir Mydll

Volume in Drive D has no label
Volume Serial number is 18f0-186b
Directory of D:\MASM7

Mydll ASM 1,675 02-17-03 21:12 mydll.asm
Mydll DEF 02-17-03 20:48 mydll.def
Mydll INC 02-17-03 21:28 mydll.inc
Mydll DLL 2,560 02-17-03 20:49 MyDll.DLL
Mydll LIB 2,064 02-17-03 20:49 MyDll.lib
Mydll EXP 516 02-17-03 20:49 Mydll.exp
6 file (s) 6,879 bytes
0 dir (s) 2,398,564,352 bytes free

Note: Copy the mydll.inc to the \masm32\include directory, copy the mydll.lib to the \masm32\lib directory, and copy the MyDLL.DLL to the same directory as the program or ....
-------------------------------------------------------------------
Call the generated dynamic link library and see how it works!

; Example: File name: 10.asm
; Call MyDll.dll to see if it works

.386
. Model Flat,stdcall
Option Casemap:none

Include Windows.inc

Include Mydll.inc
Include Masm32.inc
Include Kernel32.inc

Includelib Mydll.lib
Includelib Masm32.lib
Includelib Kernel32.lib

. Data?
Charout db DUP (?)

. Code
Start
MOV edx,12345678h
MOV eax,87654321h
Invoke Outedxeax,addr charout; convert with our own program!
Invoke Stdout,addr Charout
Invoke Exitprocess,null
End Start

Open file 10.asm with EditPlus, execute "tools \ Compile & link & Run" or use "ctrl+1" directly to see the results of execution: 1311768467139281697, right?