How to get function signature using IDA Python in IDA Pro

Question

I open .exe file in IDA with .pdb attached to it, so IDA scans .pdb and shows function names.

I need to get signature strings of many functions. I can't do it manually so I want to use built-it IDA Python console

For example: function on address 00007FF68E528660 has signature int __fastcall lua_error(lua_State *L)

I got my function address (ea)

def GetFunctionByName(name):
    ea = BeginEA()
    for funcAddr in Functions(SegStart(ea), SegEnd(ea)):
        funcName = GetFunctionName(funcAddr)
        if funcName == name:
            return funcAddr
    return None
print function_i_need(GetFunctionByName("lua_error"))

#should print "int __fastcall lua_error(lua_State *L)" or something familiar

I don't know how to implement function_i_need

How do I get that signature string using python code?

Answer 1

if you can use idc or adapt idc to python you can do some thing like this

#include <idc.idc>
static main() 
{
    auto funfirst,funnext,i = 0;
    funfirst = get_next_func( MinEA() );
    while (funnext != BADADDR) 
    {
        Message("fun[%04d] %x %s\n" ,i++ , funfirst, get_name(funfirst,GN_DEMANGLED));
        funnext = get_next_func(funfirst); 
        funfirst = funnext;
    }
}

should yield names as follows

fun[0000] 180001008 private: static long AppContainerRegistration::CreateAppContainerKeySecurityDescriptor(struct _GUID const *,void *,void *,void *,unsigned long,unsigned long *,void * *,unsigned short *)
fun[0001] 1800014e0 UrlHashW
fun[0002] 180001590 UrlHashA
fun[0003] 1800015e8 void _HashData(unsigned char const *,unsigned long,unsigned char *,unsigned long)
fun[0004] 180001660 SystemTimeToTzSpecificLocalTimeEx
fun[0005] 18000190c AddTimeZoneRules
fun[0006] 180001ad4 AddTimeZoneRule
fun[0007] 180001b28 RtlpGetLastBias
fun[0008] 180001b60 StrRChrIW
fun[0009] 180001bcc public: long StateSpace::CreateSystemAppDataRoamingSubkey(struct HKEY__ * *)