freeDB_man
5th May 2008 14:38 UTC

Plugin & Stack
i need my plugin to be able to read to the NSIS stack as well as to write to the NSIS stack.

How do I do this? I am using C++.

Anders
5th May 2008 14:50 UTC

http://nsis.svn.sourceforge.net/view...Contrib/ExDLL/

freeDB_man
5th May 2008 14:55 UTC

I know about exdll. How do I use that header to read & write to the stack?

{_trueparuex^}
5th May 2008 16:24 UTC

popstring() and pushstring()

freeDB_man
5th May 2008 16:43 UTC

You mean like this:

pushstring("1");

var = popstring();

kichik
5th May 2008 19:14 UTC

No, not like this. pushstring() is correct, but popstring() receives a buffer into which the string from the stack is written. It must be the size passed to your function as string_size.

freeDB_man
5th May 2008 19:46 UTC

pushstring() is not working with my plugin. Is there anything specific I must add to it?

Anders
5th May 2008 20:08 UTC

you must call the exdll.h macro, EXDLL_INIT() inside your exported function

freeDB_man
5th May 2008 20:39 UTC

I get this error:

D:\Development Tools\Scripts\C++\dll\TG tests\tsts\mytestlibrary.cc: In function
`void Create()':
D:\Development Tools\Scripts\C++\dll\TG tests\tsts\mytestlibrary.cc:9: error: `s
tring_size' undeclared (first use this function)
D:\Development Tools\Scripts\C++\dll\TG tests\tsts\mytestlibrary.cc:9: error: (E
ach undeclared identifier is reported only once for each function it appears in.
)
D:\Development Tools\Scripts\C++\dll\TG tests\tsts\mytestlibrary.cc:9: error: `s
tacktop' undeclared (first use this function)
D:\Development Tools\Scripts\C++\dll\TG tests\tsts\mytestlibrary.cc:9: error: `v
ariables' undeclared (first use this function)

freeDB_man
6th May 2008 15:54 UTC

I have given up. There should be a "how to create a plugin in the NSIS manual"

Can anybody tell me how to use exdll? I have a function called Create in my dll and all I need is to be able to access the NSIS stack and read & write to the stack.

l0k1
6th May 2008 16:04 UTC

If you use only pop and push just add

/******************************************************************************
/* Defines                                                                                                                                        *
******************************************************************************/
// for NSIS stack
#define EXDLL_INIT()                            \
{                                                                       \
        g_stacktop              = stacktop;             \
        g_variables             = variables;    \
        g_stringsize    = string_size;  \
}
#define MAX_STRLEN      1024
/******************************************************************************
/* NSIS stack structure                                                                                                           *
******************************************************************************/
typedef struct _stack_t {
        struct  _stack_t *next;
        char    text[MAX_STRLEN];
} stack_t;
/******************************************************************************
/* Global values                                                                                                                          *
******************************************************************************/
// for NSIS stack
stack_t                 **g_stacktop;
char                    *g_variables;
unsigned int    g_stringsize;
/******************************************************************************
* FUNCTION NAME: pushstring                                                                                                       *
*     PARAMETER: STR                                                                                                              *
*               PURPOSE: Removes the element from the top of the NSIS stack and puts  *
*                                it in the buffer.                                                                                        * 
*                RETURN: TRUE if stack is empty, FALSE if value is loaded.                        *
******************************************************************************/
int popstring(char *str)
{
        stack_t *th;

        if (!g_stacktop || !*g_stacktop) return 1;

        th=(*g_stacktop);
        lstrcpy(str,th->text);
        *g_stacktop = th->next;
        GlobalFree((HGLOBAL)th);

        return 0;
}
/******************************************************************************
* FUNCTION NAME: pushstring                                                                                                       *
*         PARAMETER: STR                                                                                                                  *
*               PURPOSE: Adds an element to the top of the NSIS stack                             * 
******************************************************************************/
void pushstring(const char *str)
{
        stack_t *th;

        if (!g_stacktop) return;
        
        th=(stack_t*)GlobalAlloc(GPTR, sizeof(stack_t)+g_stringsize);
        lstrcpyn(th->text,str,g_stringsize);
        th->next=*g_stacktop;
        
        *g_stacktop=th;
}

extern "C"
void __declspec(dllexport) TheNameOfMyExternalFunction(HWND hwndParent, int string_size, char *variables, stack_t **stacktop)

freeDB_man
6th May 2008 16:23 UTC

OK. It works now. Thanks