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Question

我试图挂钩外部进程（Cubase）以便按顺序拦截键盘事件（特别是＆＃34; ctrl + shift + s＆＃34; [另存为]）到SendInput(...)使用当前日期＆amp;填充文件名文本区域时间。过了一段时间，我意识到我几乎不能理解C++以达到理想的结果，所以我稍微调整了this code。

DLL：

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

HINSTANCE hinst;
#pragma data_seg(".shared")
HHOOK g_hook = 0;
#pragma data_seg()

LRESULT CALLBACK HookProc(int code, WPARAM wParam, LPARAM lParam) {
    printf_s("callback...\n");
    if (code < 0) {
        return CallNextHookEx(g_hook, code, wParam, lParam);
    }

    KBDLLHOOKSTRUCT kbd = *((KBDLLHOOKSTRUCT*) lParam);

    if (kbd.vkCode == 0x53 && GetKeyState(VK_CONTROL) < 0 && GetKeyState(VK_SHIFT) < 0) { // 0x53 -> 's'
        MessageBox(NULL, "ctrl + shift + s", "CALLBACK", MB_ICONINFORMATION);
    }

    return CallNextHookEx(g_hook, code, wParam, lParam);
}

extern "C" __declspec(dllexport) void install(DWORD threadID) {
    if (!(g_hook = SetWindowsHookEx(WH_KEYBOARD, HookProc, hinst, threadID))) {
        printf_s("failed installing hook...\n");
    }
    else {
        printf_s("hook installed...\n");
    }

}
extern "C" __declspec(dllexport) void uninstall() {
    UnhookWindowsHookEx(g_hook);
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
    hinst = hinstDLL;
    return TRUE;
}

main.cpp中：

#include <tchar.h>
#include <Windows.h>

#define APP_PATH _T("C:\\Program Files (x86)\\Steinberg\\Cubase 5\\Cubase5.exe")

int _tmain(int argc, _TCHAR* argv[]) {

    HINSTANCE hinst = LoadLibrary(_T("CuBaseHook.dll")); 

    if (hinst) {
        typedef void (*Install)(DWORD);
        typedef void (*Uninstall)();

        Install install = (Install) GetProcAddress(hinst, "install");
        Uninstall uninstall = (Uninstall) GetProcAddress(hinst, "uninstall");

        STARTUPINFO         info{ sizeof(info) };
        PROCESS_INFORMATION pInfo;
        if (CreateProcess(APP_PATH, "", NULL, NULL, TRUE, 0, NULL, NULL, &info, &pInfo)) {
            install(pInfo.dwThreadId);

            MSG msg;
            while (GetMessage(&msg, NULL, 0, 0) != 0)
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }

            uninstall();
        }
    }

    return 0;
}

以上编译，但在SetWindowsHookEx(WH_KEYBOARD, HookProc, hinst, threadID) DLL函数的install(...)上失败。

坦率地说，我不明白为什么。是hinstDLL还是threadID问题？

PS：如果有其他方法可以达到预期效果，那么请一定告诉我......