php设计之登录模块(验证码的生成及验证)

/**
*Environment : VS2005
*/

DLL:
File name:HookDll.ccp

=============================================
#include <windows.h>
#include "string.h"
#include "stdio.h"

HINSTANCE hInst;

#pragma data_seg("hookdata")
HHOOK oldkeyhook=0;
#pragma data_seg()

#pragma comment(linker,"/SECTION:hookdata,RWS")

#define DllExport extern "C"__declspec(dllexport)
void writeFile1(char *msg);
DllExport LRESULT CALLBACK KeyBoardProc(int nCode,WPARAM wParam, LPARAM lParam );
DllExport void InstallHook(int nCode);
DllExport void EndHook(void);

BOOL WINAPI DllMain(HINSTANCE hInstance,ULONG What,LPVOID NotUsed)
{
switch(What)
{
case DLL_PROCESS_ATTACH:
hInst = hInstance;
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;

}
return 1;
}

void InstallHook(int nCode)
{
oldkeyhook = SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyBoardProc,hInst,0);
}

DllExport LRESULT CALLBACK KeyBoardProc(int nCode,WPARAM wParam, LPARAM lParam )
{
/*
WPARAM j;
FILE *fp;
errno_t err;
if(lParam&0x80000000)
{
j = wParam;
err=fopen_s(&fp,"c:\hookkey.txt","a");
fprintf(fp,"%4d",j);
fclose(fp);
}
*/
writeFile1("callback function invoked");
return CallNextHookEx(oldkeyhook,nCode,wParam,lParam);
}
void EndHook(void)
{
UnhookWindowsHookEx(oldkeyhook);
}
void writeFile1(char *msg){

FILE *fp;
fp=fopen("C:/test1.txt","a");
fputs(msg,fp);
fputs("\n",fp);
fclose(fp);

}

=================================================
testing
File name:hookTest.ccp

=================================================

#include "stdio.h"
#include <windows.h>

void main(void)
{

typedef void(*installHook)(int ncode);
typedef void(*killHook)(void);
HINSTANCE hDLL; installHook iHook; killHook kHook;
hDLL=LoadLibrary(TEXT("hookdll2.dll"));
if(hDLL!=NULL){
MessageBox (NULL, TEXT ("Hello, Windows 00000000000!"), TEXT ("HelloMsg"), 0);
iHook=(installHook)GetProcAddress(hDLL,"InstallHook");
kHook=(killHook)GetProcAddress(hDLL,"EndHook");
if(iHook){
MessageBox (NULL, TEXT ("Hello, Windows 11111111111111!"), TEXT ("HelloMsg"), 0);
iHook(0);
}
if(kHook){
MessageBox (NULL, TEXT ("Hello, Windows 2222222222222222!"), TEXT ("HelloMsg"), 0);
kHook();
}
FreeLibrary(hDLL);
}

}