怎么在C中使用DLL

[zhan1094]

#include "dll.h"
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include<time.h>
#pragma data_seg("sharehook")
HHOOK sharedata;
#pragma data_seg()

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

LRESULT CALLBACK ShellHookProc(int nCode,WPARAM wParam,LPARAM lParam);
void SaveLog(char *n);
HINSTANCE hInce;
HHOOK myhook;

/*DLLIMPORT void ShellHook ()
{
MessageBox (0, "Hello World from DLL!\n", "Hi", MB_ICONINFORMATION);
}*/


BOOL APIENTRY DllMain (HINSTANCE hInst /* Library instance handle. */ ,
DWORD reason /* Reason this function is being called. */ ,
LPVOID reserved /* Not used. */ )
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
// sethook();
//sharedata=(HHOOK)SetWindowsHookEx(WH_SHELL,ShellHookProc,hInce,0);
break;

case DLL_PROCESS_DETACH:
//unsethook();
//if( UnhookWindowsHookEx(sharedata))
//sharedata=NULL;
break;

case DLL_THREAD_ATTACH:
break;

case DLL_THREAD_DETACH:
break;
}

/* Returns TRUE on success, FALSE on failure */
return TRUE;
}


DLLIMPORT int sethook()
{

if(myhook=(HHOOK)SetWindowsHookEx(WH_SHELL,ShellHookProc,hInce,0))
{
sharedata=myhook;
return 1;
}
return 0;
}


DLLIMPORT int unsethook()
{
if( UnhookWindowsHookEx(sharedata))
{
myhook=NULL;
return 1;
}
else
return 0;
}


LRESULT CALLBACK ShellHookProc(int nCode,WPARAM wParam,LPARAM lParam)
{
if(sharedata)
{
if (nCode==HSHELL_WINDOWCREATED)
{
HWND hwm=(HWND)wParam;
char *strName;
strName=(char*)malloc(256);
GetWindowText(hwm,strName,256);
SaveLog(strName);
/*if (strName=="扫雷")
{
GetSafeHwnd(WM_CLOSE,0,0);
}*/
}
}
return CallNextHookEx(myhook,nCode,wParam,lParam ) ;
}


void SaveLog(char *n)
{
//char *name=n;
FILE *log;
struct tm *systime;
time_t t;
t=time(NULL);
systime=localtime(&t);
if((log=fopen("syslog.log","a+"))==NULL)
exit(1);
else
fprintf(log,"open %s at %5d%5d%5d%5d%5d%5d",n,systime->tm_year,systime->tm_mon,systime->tm_mday,systime->tm_hour,systime->tm_min,systime->tm_sec);
fclose(log);
}


这是编译生成DLL的源程序，目的是设置全局的shell钩子
但不知道在其它的程序中怎么用编译连接好的DLL
有哪位可以帮帮我啊！！！！！！！！

[zhan1094]

谢谢楼上的！

再请问一下 “typedef VOID (*MYPROC)(LPTSTR);” 是什么意思啊？

[sleepynow]

回楼上，定义一个函数指针啊

[zhan1094]

谢谢各位~~

[帅得不敢出门]

[Quote=引用 7 楼 sleepynow 的回复:]
回楼上，定义一个函数指针啊
[/Quote]

是函数指针类型

这样方便后面指针的声明

MYPROC ProcAdd;

[sheenl]

你的这段钩子代码从哪里得来的? 好像是错的.

sharedata这个变量无法在不同的进程间共享.

[zhan1094]

那要怎么做呢？楼上的！！！

[xkyx_cn]

mark

[babyvox1999]

把头文件，DLL包含进其他工程的编译，连接依赖

[zhan1094]

我的编译环境是DEV-C++

总是出现 [Linker error] undefined reference to `_imp__sethook' 的错误

是怎么回事呢？

[michney]

LoadLibrary()
GetProcAddress()
通过函数指针调用
FreeLibrary()

[michney]

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

typedef VOID (*MYPROC)(LPTSTR);

VOID main(VOID)
{
HINSTANCE hinstLib;
MYPROC ProcAdd;
BOOL fFreeResult, fRunTimeLinkSuccess = FALSE;

// Get a handle to the DLL module.

hinstLib = LoadLibrary("myputs");

// If the handle is valid, try to get the function address.

if (hinstLib != NULL)
{
ProcAdd = (MYPROC) GetProcAddress(hinstLib, "myPuts");

// If the function address is valid, call the function.

if (fRunTimeLinkSuccess = (ProcAdd != NULL))
(ProcAdd) ("message via DLL function\n");

// Free the DLL module.

fFreeResult = FreeLibrary(hinstLib);
}

// If unable to call the DLL function, use an alternative.

if (! fRunTimeLinkSuccess)
printf("message via alternative method\n");
}