简单的dll注入

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




BOOL InjectDll(DWORD dwPiD, LPCTSTR szDllPath) {
	//dwpid是要注入的进程的pid，szdllpath是要注入的dll
	HANDLE hProcess = NULL, hThread = NULL;
	HMODULE hMod = NULL;
	LPVOID pRemoteBuf = NULL;
	DWORD dwBufSize = (DWORD)(_tcslen(szDllPath) + 1) * sizeof(TCHAR);
	LPTHREAD_START_ROUTINE pThreadProc;
	//pThreadProc是要获取的dll中函数的地址


	if (!(hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwPiD))) {
		_tprintf(L"OpenPtocess(%d) failed!!![%d]
", dwPiD, GetLastError());
		return FALSE;
	}


	pRemoteBuf = VirtualAllocEx(hProcess, NULL, dwBufSize, MEM_COMMIT, PAGE_READWRITE);
	//分配空间，空间里存一个dllname那么大的空间，返回的是分配的空间的起始地址

	WriteProcessMemory(hProcess, pRemoteBuf, (LPVOID)szDllPath, dwBufSize, NULL);
	//将路径写入内存

	hMod = GetModuleHandle(L"kernel32.dll");
	pThreadProc = (LPTHREAD_START_ROUTINE)GetProcAddress(hMod, "LoadLibraryW");
	//pThreadProc这里为LoadLibraryW的地址

	hThread = CreateRemoteThread(hProcess, NULL, 0, pThreadProc, pRemoteBuf, 0, NULL);
　　　　//在目标进程中运行线程
	//这里用loadlibaryw去调用dll名字
	WaitForSingleObject(hThread, INFINITE);
	//等待进程结束
	CloseHandle(hThread);
	CloseHandle(hProcess);
	return TRUE;
}




int _tmain(int argc, TCHAR* argv[]) {
	if (argc != 3) {
		_tprintf(L"USAGE : %s pid dll_path
", argv[0]);
		return 1;
	}
	if (InjectDll((DWORD)_tstol(argv[1]), argv[2])) {
		_tprintf(L"InjectDll ("%s") success!!!
", argv[2]);
	}
	else {
		_tprintf(L"InjectDll ("%s") failed!!!
", argv[2]);
	}

}

　　

bool IsAlreadyRun() {
	HANDLE hMutex = NULL;
	hMutex = CreateMutex(NULL, true, "TEST");
	if (hMutex) {
		if (ERROR_ALREADY_EXISTS == GetLastError()) {
			CloseHandle(hMutex);
			hMutex = NULL;
			return true;
		}
	}
	return false;
}