使用するAPI GetCurrentThreadId #include <windows.h> #include <process.h> unsigned int WINAPI ThreadFunc(LPVOID arg) { printf("ThreadId(in ThreadFunc) = %u\n", GetCurrentThreadId()); return 0; } int main() { HANDLE hThread; unsigned int uiThreadId; hThread = (HANDLE)_beginthreadex(NULL, 0, ThreadFunc, NULL, 0, &uiThreadId); printf("MainThread's ThreadId = %u\n", GetCurrentThreadId()); printf("ThreadFun

