Loading a dll from memory

[piccaso]

By using this library.

I've compiled the c library into a static lib because i'm not good in porting
things, but its probably possible in fbc too.

Here is an easy example which shows how it's done.

Code: Select all

#Include Once "MemoryModule/libMemoryModule.bi"

' Created by v1ctor's bin2bas, original Source of 
' the dll found in "TestDll_src.bas"
#Include Once "TestDll.bas"

Dim As HMEMORYMODULE hDll
Dim As Integer iRval

' Prototype of the Procedure 
Dim zStrPrint As Function Cdecl (zStr As ZString ptr) As Integer

' LoadLibrary
hDll = MemoryLoadLibrary(@TestDll_data(0))
If hDll = 0 Then
	Print "Error in MemoryLoadLibrary() Call"
	Sleep : System(1) 
EndIf

' GetProcAddress
zStrPrint = MemoryGetProcAddress(hDll,"szStringPrint")
If zStrPrint = 0 Then
	Print "Error in MemoryGetProcAddress() Call"
	Sleep : System(1)
EndIf

' Call It
iRval = zStrPrint(StrPtr("Test It")) ' Displays the zString and
Print "iRval =";iRval                ' returns the len() of it

' FreeLibrary
MemoryFreeLibrary(hDll)

Sleep

The static lib and everything needed to build the example can be
found in this archive (MemMod.zip).

Happy studying :)

[cha0s]

Looks neat =)

[D.J.Peters]

I compiled the memory lib loader self as a library
but this version will work only with realy simple types of DLL's
and with a short number of exported function.
if i use any COM interfaces in the dll MemoryLoadLibrary will crash.
same with your static version.

by the way the COM interfaces as file library loaded with
DyLibLoad() works without any trouble.

Joshy

[piccaso]

since the os isnt aware of the module there are many things can that go wrong.
Like the HINSTANCE passed to DllMain is just an address in memory and windows' api's dont know what to do with it...

And there is no magic inside so COM will never work with this :)

but there are some alternatives you could try:
Virtual PE - the example is for loading exe's but look inseide the zip...
Dll to Lib - not free but supports COM

[oyster]

where can I get the code for fb? thanx?

[voodooattack]

I remember I ported this before: http://www.freebasic.net/forum/viewtopi ... 948#104948

I never put it up in Tips & Tricks though.. :)

since the os isnt aware of the module there are many things can that go wrong.
Like the HINSTANCE passed to DllMain is just an address in memory and windows' api's dont know what to do with it...

And there is no magic inside so COM will never work with this :)

Yeah, but this lib is more for "Quick and dirty" implementations, nothing complex, but as long as you know what you're doing all should go well.. ;)

[sanhen]

Download failure. I now ask where to download?

[Cherry]

Here: http://www.joachim-bauch.de/tutorials/l ... om-memory/