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main.obj : error LNK2028: se hace referencia al símbolo (token) sin resolver (0A00003E) "extern "C" int __stdcall MessageBoxA(struct HWND__ *,char const *,char const *,unsigned int)" (?MessageBoxA@@$$J216YGHPAUHWND__@@PBD1I@Z) en la función "extern "C" int __cdecl MessageBox(struct HWND__ *,char const *,char const *,unsigned int)" (?MessageBox@@$$J0YAHPAUHWND__@@PBD1I@Z)[code]
nose q mas probar porfavor ayuda xD (cambiando de unicode a multibyte tmapoco se soluciona) Pd: si lo compilo con devc++ funciona perfect el code es el siguiente:
[code]#include <windows.h>

int main() 
{
	HWND hWnd = FindWindow(0, "Calculator");
  	if(hWnd == 0)
	{
    		MessageBox(0, "Error cannot find window.", "Error", MB_OK|MB_ICONERROR);
  	} 
	else 
	{
    		DWORD proccess_ID;
    		GetWindowThreadProcessId(hWnd, &proccess_ID);
    		HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, proccess_ID);
    		if(!hProcess)
		{
      			MessageBox(0, "Could not open the process!", "Error!", MB_OK|MB_ICONERROR);
    		} 
		else 
		{
      			int newdata = 500;
     		 	DWORD newdatasize = sizeof(newdata);
      			if(WriteProcessMemory(hProcess, (LPVOID)0x57C2A4, &newdata, newdatasize, NULL))
			{
        				MessageBox(NULL, "WriteProcessMemory worked.", "Success", MB_OK + MB_ICONINFORMATION);
      			} 
			else 
			{
        				MessageBox(NULL, "Error cannot WriteProcessMemory!", "Error", MB_OK + MB_ICONERROR);
      			}
      			CloseHandle(hProcess);
    		}
  	}
  	return 0;
}

#pragma comment(lib, "user32")