GitHub - microsoft/Detours: Detours is a software package for monitoring and instrumenting API calls on Windows. It is distributed in source code form.

/*

挂载钩子 setdll /d:C:\Users\g\source\repos\LotTest\Release\lotDll.dll C:\Users\g\source\repos\LotTest\bin\x86\Release\net6.0-windows\LotTest.exe
卸载钩子 setdll /r C:\Users\g\source\repos\LotTest\bin\x86\Release\net6.0-windows\LotTest.exe
*/

#include <Windows.h>
#include "detours/detours.h"

//真实的调用函数，函数原型必须和真实API一致。部分类型如果无法声明可以用void *替代
static int (WINAPI* REALMessageBox) (HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption, UINT uType) = MessageBox;
//伪造的调用函数，也就是我们的钩子，参数类型和返回值必须和真实的一样，
static int WINAPI MYMessageBox(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption, UINT uType)
{
	//在这里可以任意发挥~~~
	//在函数末尾调用真正的API来返回
	return  REALMessageBox(NULL, "MyHook!! MessageBoxCRACK!!", "Please", MB_OK);
}

void StartHook()
{
	long err;
	DetourRestoreAfterWith();
	//开始事务
	DetourTransactionBegin();
	//更新线程信息  
	DetourUpdateThread(GetCurrentThread());
	//将拦截的函数附加到原函数的地址上
	DetourAttach(&(PVOID&)REALMessageBox, MYMessageBox);
	//结束事务
	err = DetourTransactionCommit();
}

//解除钩子
void EndHook()
{
	//开始事务
	DetourTransactionBegin();
	//更新线程信息 
	DetourUpdateThread(GetCurrentThread());
	//将拦截的函数从原函数的地址上解除
	DetourDetach(&(PVOID&)REALMessageBox, MYMessageBox);
	//结束事务
	DetourTransactionCommit();
}


/*
// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include "pch.h"
#include "framework.h"

extern void StartHook();//新增

//新增一个导出函数，这个可以随便写，但必须至少有一个导出函数才能使用setdll远程注入
VOID __declspec(dllexport) test()
{
	OutputDebugString(L"__declspec(dllexport) test() \r\n");
}

BOOL APIENTRY DllMain(HMODULE hModule,
	DWORD  ul_reason_for_call,
	LPVOID lpReserved
)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	{ StartHook(); } //新增
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}
*/

void injectProcess() {
	HANDLE hProcess = OpenProcess(PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ,
		FALSE, pid);

	if (hProcess != NULL)
	{
		TRACE("InjectHook \n");
		HANDLE hThread;
		char   szLibPath[_MAX_PATH];
		void* pLibRemote = 0;
		DWORD  hLibModule = 0;

		HMODULE hKernel32 = ::GetModuleHandle("Kernel32");

		if (!::GetSystemDirectory(szLibPath, _MAX_PATH))
			return;

		strcat(szLibPath, "C:\\windows\\HookDll.dll");

		pLibRemote = ::VirtualAllocEx(hProcess, NULL, sizeof(szLibPath), MEM_COMMIT, PAGE_READWRITE);

		if (pLibRemote == NULL)
			return;

		::WriteProcessMemory(hProcess, pLibRemote, (void*)szLibPath, sizeof(szLibPath), NULL);

		hThread = ::CreateRemoteThread(hProcess, NULL, 0,
			(LPTHREAD_START_ROUTINE) ::GetProcAddress(hKernel32, "LoadLibraryA"),
			pLibRemote, 0, NULL);

		if (hThread != NULL)
		{
			::WaitForSingleObject(hThread, INFINITE);
			::GetExitCodeThread(hThread, &hLibModule);
			::CloseHandle(hThread);
		}
	}
}

void test() {
	StartHook();
	PVOID g_pOldMessageBoxW = NULL;
	PVOID g_pOldMessageBoxA = NULL;
	g_pOldMessageBoxA = DetourFindFunction("User32.dll", "MessageBoxA");
	MessageBox(0, "test", "test", 0);
	EndHook();
}

创作不易，小小的支持一下吧！