我正在为键盘设置一个全局钩子(Hook)。当我向其他应用程序提供键盘输入时,该应用程序未接收到输入并挂起。当控制台停止时,应用程序恢复并且键盘输入被发送到一起。
动态链接库源:
#include <iostream>
#include <Windows.h>
#include <string>
using namespace std;
#define DLLEXPORT __declspec(dllexport)
DLLEXPORT bool installhook();
DLLEXPORT void unhook();
DLLEXPORT string TestLoaded();
DLLEXPORT LRESULT CALLBACK KeyboardProc ( int code, WPARAM wParam, LPARAM lParam );
static HHOOK kb_hook;
string test = "not loaded";
HINSTANCE hDLL;
DLLEXPORT LRESULT CALLBACK KeyboardProc ( int code, WPARAM wParam, LPARAM lParam )
{
if(code == HC_ACTION) // if there is an incoming action and a key was pressed
{
switch(wParam)
{
case VK_SPACE:
printf("Space was pressed\n"); //tried without this also
MessageBoxA(NULL, "Hi", "Space", MB_OK);
break;
}
}
return CallNextHookEx(NULL, code, wParam, lParam);
}
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
test = "loaded";
switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hDLL = hModule;
break;
}
printf("test str = %s \n", test.c_str());
return TRUE;
}
bool installhook()
{
kb_hook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, hDLL, NULL);
if(!kb_hook)
{
return false;
}
return true;
}
void unhook()
{
if(kb_hook)
{
UnhookWindowsHookEx(kb_hook);
}
}
string TestLoaded()
{
return test;
}
控制台应用程序来源:
#include <iostream>
#include <Windows.h>
#include <string>
#define DLLIMPORT __declspec(dllimport)
using namespace std;
DLLIMPORT void unhook();
DLLIMPORT bool installhook();
DLLIMPORT string TestLoaded();
int main()
{
cout << TestLoaded() <<endl;
installhook();
for(int i = 1; i<=10 ; i++)
{
//Do some keyboard activities in this 10 secs
Sleep(1000);
cout << i<<endl;
}
unhook();
cin.get();
return 1;
}
我的怀疑是,由于 dll 将被加载到进程自己的地址空间中的每个进程中,并且控制台不会出现在其他应用程序中,因此它变得无效并崩溃。所以我删除了控制台输出并替换为消息框。那么也没有区别。
可能是什么问题?
更新:
在尝试全局之前,我尝试对特定线程进行本地 Hook 。但是我在 setwindowshookex 收到 Parameter is incorrect
错误 87
。以下是更新后的代码:
动态链接库:
bool installhook(DWORD ThreadId) //exporting this function
{
kb_hook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, NULL, ThreadId); //tried with the dll module's handle also instead of NULL
if(!kb_hook)
{
printf("SetWindowsHookEx failed : %d\n", GetLastError());
return false;
}
return true;
}
控制台应用程序源:
DWORD myThread()
{
cout<< "Thread started\n";
char str[250];
cin>>str;
return 0;
}
int main()
{
cout << TestLoaded() <<endl;
DWORD myThreadID;
HANDLE myHandle = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)myThread, NULL, 0, &myThreadID);
installhook(myThreadID);
for(int i = 0; i<100 ; i++)
{
Sleep(100);
if(i%10 == 0)
{
cout << i<<endl;
}
}
unhook();
}
最佳答案
尝试使用 WH_KEYBOARD_LL。即使没有 dll 在您的进程中声明钩子(Hook)函数,您也可以设置全局钩子(Hook)。另外,您应该使用 PKBDLLHOOKSTRUCT 结构检测空间操作
LRESULT CALLBACK KeyboardProc ( int code, WPARAM wParam, LPARAM lParam )
{
if ( code == HC_ACTION )
{
switch ( wParam )
{
case WM_KEYDOWN:
{
// Get hook struct
PKBDLLHOOKSTRUCT p = ( PKBDLLHOOKSTRUCT ) lParam;
if ( p->vkCode == VK_SPACE)
{
MessageBoxA( NULL, "Hi", "Space", MB_OK );
}
}
break;
}
}
return CallNextHookEx( NULL, code, wParam, lParam );
}
....
// Somewhere in code
kb_hook = SetWindowsHookEx( WH_KEYBOARD_LL, KeyboardProc, NULL, NULL );
关于c++ - 全局安装的键盘钩子(Hook)防止键盘输入到其他应用程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47634589/