c – 如何将整数传递给CreateThread()？

如何将int参数传递给CreateThread回调函数？我试试看：

DWORD WINAPI mHandler(LPVOID sId) {
...
arr[(int)sId]
...
}

int id=1;
CreateThread(NULL,NULL,mHandler,(LPVOID)id,NULL);

但我收到警告：

warning C4311: 'type cast' : pointer truncation from 'LPVOID' to 'int'
warning C4312: 'type cast' : conversion from 'int' to 'LPVOID' of greater size

解决方法

传递整数的地址而不是其值：

// parameter on the heap to avoid possible threading bugs
int* id = new int(1);
CreateThread(NULL,id,NULL);


DWORD WINAPI mHandler(LPVOID sId) {
    // make a copy of the parameter for convenience
    int id = *static_cast<int*>(sId);
    delete sId;

    // Now do something with id
}