c++ - prototype for `' does not match any in class `' -

i've got problem while compilling program:

prototype int sromemory::readstring(unsigned int) not match in class sromemory

whats going on?

here's link dev c++ project: https://www.sendspace.com/file/uop8m8

#include "memory.h"  sromemory::sromemory() {           getwindowthreadprocessid(findwindow(null, (lpcstr)text("tibia")), &proc_id);           proc_handle = openprocess(0x10, false, proc_id); }  int sromemory::readstring(unsigned int pointer) {         char cvalue[24] = "\0";         readprocessmemory(proc_handle, (lpvoid)pointer, &cvalue, sizeof(cvalue), null);         string value = cvalue;         return value; } 

this main.cpp:

#include <iostream> #include "memory.h"  using namespace std;  int main(void) {      bool exit = false;       sromemory memory;       string loginpass = memory.readstring(0x78f554);       cout << "loginpass: " << loginpass << "\n";            {       }while(!exit); } 

and memory.cpp:

#include "memory.h"  sromemory::sromemory() {           getwindowthreadprocessid(findwindow(null, (lpcstr)text("tibia")), &proc_id);           proc_handle = openprocess(0x10, false, proc_id); }  int sromemory::readstring(unsigned int pointer) {         char cvalue[24] = "\0";         readprocessmemory(proc_handle, (lpvoid)pointer, &cvalue, sizeof(cvalue), null);         string value = cvalue;         return value; } 

yup , forgot memory.h:

#include <iostream> #include <string> #include <stdio.h> #include <stdlib.h> #include <windows.h>  using namespace std;  class sromemory {     public:         sromemory();         int readpointer(unsigned int pointer);         int readoffset(unsigned int offset);         string readstring(unsigned int pointer);     private:         dword proc_id;         handle proc_handle; }; 

the function signature (in source file) doesn't match signature of prototype (declaration in header): change following line in source file:

int sromemory::readstring(unsigned int pointer) 

to

string sromemory::readstring(unsigned int pointer) 

another possibility according prototype... not match in class... (error). g++ is, source file includes wrong header file