Push Variable correctly ?

[BackupUser]

Restored from previous forum. Originally posted by Rings.

I want to call a external DLL.LoadLibrary,GetProcAdress and Call does work, but i have trouble Pushing Variables on the Stack and getting them back after call.Always get an Assembly Error.
It must be a simply syntax-error.How to do it (Push) correctly in PureBasic ?
The WinIO Libs is from http://www.internals.com .

;
Procedure CallDLL(DLLFile$,DLLFunction$)
hLib.l
lpDLLEntryPoint.l
hLib = LoadLibrary_(DLLFile$) ;Load the DLL into memory
If hLib =0
ProcedureReturn 0
EndIf

lpDLLEntryPoint = GetProcAddress_(hLib, DLLFunction$) ;'Find Procedure in DLL
If lpDLLEntryPoint = 0
FreeLibrary_(hLib)
ProcedureReturn -1 ;This is not a ActiveX
EndIf
FreeLibrary_(hLib)
ProcedureReturn lpDLLEntryPoint
EndProcedure

Result.l

Result1=CallDLL("c:\WinIO\DLL\release\winio.dll","InitializeWinIo")
Result2=CallDLL("c:\WinIO\DLL\release\winio.dll","ShutdownWinIo")
;Declare Function GetPortVal Lib "WinIo.dll" (ByVal PortAddr As Integer, ByRef PortVal As Long, ByVal bSize As Byte) As Boolean
Result3=CallDLL("c:\WinIO\DLL\release\winio.dll","GetPortVal")
If Result1 And Result2 And Result3
hLib.l
lpDLLEntryPoint.l
DLLFile$="c:\WinIO\DLL\release\winio.dll"
hLib = LoadLibrary_(DLLFile$) ;Load the DLL into memory
DLLFunction$="InitializeWinIo"
If hLib 0
lpDLLEntryPoint = GetProcAddress_(hLib, DLLFunction$) ;'Find Procedure in DLL
If lpDLLEntryPoint 0
Call lpDLLEntryPoint
;Push Result,[EAX]
MessageRequester("INFO","DLLTest:"+Str(Result),0)
EndIf

;PortAddr As Integer, ByRef PortVal As Long, ByVal bSize As Byte

PortAddr.w=$278
PortVal.l=12
bSize.b=2

DLLFunction$="GetPortVal"
lpDLLEntryPoint = GetProcAddress_(hLib, DLLFunction$) ;'Find Procedure in DLL
If lpDLLEntryPoint 0
Push bSize
; PUSH DWORD PortVal
; PUSH DWORD PortAddr
Call lpDLLEntryPoint
;Push Result,[EAX]
EndIf
DLLFunction$="ShutdownWinIo"
lpDLLEntryPoint = GetProcAddress_(hLib, DLLFunction$) ;'Find Procedure in DLL
If lpDLLEntryPoint 0
Call lpDLLEntryPoint
MessageRequester("INFO","DLLTest:"+Str(Result),0)
;Push Result,[EAX]
EndIf
FreeLibrary_(hLib)
EndIf
Else
MessageRequester("INFO","DLLTest failed !",0)
EndIf



Getting better with a little help from my friends....thx Siggi

[BackupUser]

Restored from previous forum. Originally posted by El_Choni.

AFAIK, you must use:

Code: Select all

GetProcAddress_(hLib, @DLLFunction$)

instead of:

Code: Select all

GetProcAddress_(hLib, DLLFunction$)

I mean, use string pointers instead of strings in API function parameters. Haven't tried it, though. Anyway and, by the way, use the 'code' facility when posting, please. It helps a lot.

Bye,

El_Choni

[BackupUser]

Restored from previous forum. Originally posted by Danilo.

Nope, El_Choni.

Code: Select all

GetProcAddress_(hLib, DLLFunction.s)

PUSHes the address of the string
on the stack, so it works how it should.


@Rings: change this lines...

Code: Select all

PortAddr.l=$278 
PortVal.l=12 
bSize.l=2 
DLLFunction$="GetPortVal" 
lpDLLEntryPoint = GetProcAddress_(hLib, DLLFunction$) ;'Find Procedure in DLL 
If lpDLLEntryPoint  0 
PUSH bSize 
PUSH PortVal 
PUSH PortAddr 
CALL lpDLLEntryPoint

The Error:
bSize.b=2
[...]
PUSH bSize

There is no "PUSH m8" or "PUSH r8", only a
"PUSH imm8". And "PUSH imm8" is expanded to
a WORD before pushing.

cya,
...Danilo

Edited by - Danilo on 18 January 2002 08:42:57

[BackupUser]

Restored from previous forum. Originally posted by Rings.

thx for the first time.i will give it a try...

Getting better with a little help from my friends....thx Siggi

[BackupUser]

Restored from previous forum. Originally posted by Rings.

thx for the first time.i will give it a try...

Getting better with a little help from my friends....thx Siggi