i have a erro in vc6

[CHYGO]

struct nids_prm { ... void (*syslog) (); ... }; static void my_nids_syslog(int type, int errnum, struct ip_header *iph, void *data) {} main() { nids_params.syslog = my_nids_syslog; ... } error C2440: '=' : cannot convert from 'void (__cdecl *)(int,int,struct ip_header *,void *)' to 'void (__cdecl *)(void)' how to solve it?:rose::rose:

[Rajkumar R]

CHYGO wrote:

error C2440: '=' : cannot convert from 'void (__cdecl *)(int,int,struct ip_header *,void *)' to 'void (__cdecl *)(void)'

i think i cannot explain more clear than that. function parameters are not same.

CHYGO wrote:

how to solve it?

it depends on your need, may be,

struct nids_prm
{
...
void (*syslog) (int,int,struct ip_header *,void *);
...
};

matches your need. BTW, a basic C programing book can also solve.

[CPallini]

Short answer: this way

struct nids_prm
{
...
void (*syslog) (int , int , struct ip_header *, void *);
...
};

Long answer: use variable number of argument for your functions (and modify accordigly syslog declaration). :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

[Cadimi]

In nids_prm struct, replace void (*syslog) (); with this: void ( *syslog ) ( int , int , struct ip_header * , void * ); When you declare a function pointer, you have to define exactly the parameters of that function ^^. Enjoy yourself ^^

[toxcct]

CHYGO wrote:

cannot convert from 'void (__cdecl *)(int,int,struct ip_header *,void *)' to 'void (__cdecl *)(void)'

that's pretty clear, no ? you're passing parameters to a function which requires none !

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[CHYGO]

i don't know what's the problem is -_-! when i drag the .c file into the VC6, the build the default project,then compile ,nothing happen but when i build a WIN32 or MFC application , the error occur...

[CHYGO]

i've tried ,and the error is the same

[David Crow]

There are two possible solutions available to you: 1)

void (*syslog)(int, int, ip_header*, void*);

static void my_nids_syslog()

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

[Elias Fotinis]

When you build the single .c file, VC6 treats the code as valid C. The WIN32/MFC app is probably treating the code as C++, which in this case is invalid.

[CHYGO]

thx, i need another mothes:) i'll try it

[CHYGO]

thank u:)