Dll注入进不去DLLMain

您的代码中存在一个问题导致DLLMain无法调用。问题在于在使用WriteProcessMemory函数将DLL代码写入目标进程时，sizeof(DLL_CODE)返回的是指针的大小，而不是字符串的大小。因此，DLL代码没有正确写入目标进程。

要解决这个问题，您可以使用strlen函数来获取DLL_CODE字符串的实际大小，并将其用作WriteProcessMemory函数的参数，如下所示：

1. 将以下行代码从WriteProcessMemory调用中删除：
   sizeof(DLL_CODE)

2. 使用strlen函数来获取DLL_CODE字符串的实际大小，并将其用作WriteProcessMemory函数的参数，如下所示：
   size_t codeSize = strlen(DLL_CODE) + 1;
   WriteProcessMemory(hProcess, pRemoteCode, DLL_CODE, codeSize, NULL);

这样更正后的代码将正确地将DLL代码写入目标进程，并且DLLMain将被调用。

完整的修正代码如下：

```c
#include <Windows.h>
#include <iostream>

using namespace std;

// 用于注入的 DLL 代码
const char* DLL_CODE = R"(
#include <Windows.h>

HHOOK hHook = NULL;

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {
    if (nCode >= 0) {
        KBDLLHOOKSTRUCT* pKbdStruct = (KBDLLHOOKSTRUCT*)lParam;
        if (wParam == WM_KEYDOWN) {
            // 处理键盘事件
            MessageBox(NULL, "Key pressed in injected process!", "Hook Message", MB_OK);
        }
    }

    // 继续链中的下一个钩子或者默认过程
    return CallNextHookEx(hHook, nCode, wParam, lParam);
}

BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved) {
    MessageBox(NULL, "正在进行钩子安装", "Hook Message", NULL);
    if (ul_reason_for_call == DLL_PROCESS_ATTACH) {
        // 安装键盘钩子
        hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardProc, GetModuleHandle(NULL), 0);

        if (hHook == NULL) {
            MessageBox(NULL, "Failed to install hook in injected process!", "Hook Message", MB_OK | MB_ICONERROR);
            return FALSE;
        } else {
            MessageBox(NULL, "钩子安装成功", "Hook Message", NULL);
        }
    }

    return TRUE;
}
)";

int main() {
    // 获取目标进程的句柄
    DWORD dwProcessId = 14984;
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);

    if (hProcess == NULL) {
        std::cerr << "Failed to open process. Error code: " << GetLastError() << std::endl;
        return 1;
    }
    else {
        cout << "进程已打开" << endl;
    }

    // 在目标进程中分配内存
    size_t codeSize = strlen(DLL_CODE) + 1;
    LPVOID pRemoteCode = VirtualAllocEx(hProcess, NULL, codeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

    if (pRemoteCode == NULL) {
        std::cerr << "Failed to allocate memory in remote process. Error code: " << GetLastError() << std::endl;
        CloseHandle(hProcess);
        return 1;
    }
    else {
        cout << "已分配内存" << endl;
    }

    // 在目标进程中写入 DLL 代码
    WriteProcessMemory(hProcess, pRemoteCode, DLL_CODE, codeSize, NULL);

    // 在目标进程中创建远程线程执行DLL
    HANDLE hThread = CreateRemoteThread(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandle(L"Kernel32"), "LoadLibraryA"), pRemoteCode, 0, NULL);

    if (hThread == NULL) {
        std::cerr << "Failed to create remote thread in injected process. Error code: " << GetLastError() << std::endl;
        // 回收内存
        VirtualFreeEx(hProcess, pRemoteCode, codeSize, MEM_RELEASE);
        CloseHandle(hProcess);
        return 1;
    }
    else {
        cout << "成功创建远程线程" << endl;
    }

    return 0;
}