hello ,
this is my C code :
Code:#include<stdio.h> #include<windows.h> int main(){ HANDLE ldll; typedef int (*str)(char f); str Str; ldll = LoadLibrary(TEXT("mytest.dll")); Str = (str)GetProcAddress(ldll, "str"); char k = 's'; printf("result : %d", Str(k)); }
and i get these errors :
Error 1 error C2143: syntax error : missing ';' before 'type'
Error 2 error C2065: 'k' : undeclared identifier
i couldn't find out what the problem is .
You can't declare variables after code. Move the k declaration to above the line where you call LoadLibrary
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
thank you ^^"
another Q , when the function returns a character , the character is shown in the console as a
smiley face !!
Smiley face means the character was the null character (value 0)Originally Posted by Amera
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
how can i fix this ?
I have no idea, since the value is probably coming from the function in the DLL, and you didn't post the code for that.
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
ok , this is my dll :
mytest.cpp
Code:#include "mytest.h" char EXPORT __stdcall str(char f){ char x = f ; return x; } BOOL WINAPI DllMain(HANDLE hModule,DWORD dwReason,LPVOID lpReserved){ return TRUE; }
mytest.h
Code:#ifndef __DLL_H_ #define __DLL_H_ #include <windows.h> #define EXPORT __declspec(dllexport) #else #define EXPORT __declspec(dllimport) #endif #ifdef __cplusplus extern "C" { #endif char EXPORT __stdcall str(char f); #ifdef __cplusplus } #endif
when i change the function returned type into integer it works fine !!
The problem is in mytest.h:
Your function is not being declared. Therefore the compiler assumes that it returns int. Therefore it only works correctly when it returns int.Code:#ifndef __DLL_H_ #define __DLL_H_ #include <windows.h> // You are missing an #ifdef here, but I don't know what. #define EXPORT __declspec(dllexport) #else // this else matches with the #ifndef __DLL_H_ above // Therefore, none of the following code is seen by the compiler #define EXPORT __declspec(dllimport) #endif #ifdef __cplusplus extern "C" { #endif char EXPORT __stdcall str(char f); #ifdef __cplusplus } #endif
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
Thank you very much my friend ^^
Everything is working fine now.
