今天用VC6编译7Z的SDK，报错一大堆：
Compiling…7zFile.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parentheses7zStream.cAlloc.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parenthesesLzFind.cLzFindMt.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parenthesesLzmaDec.cLzmaEnc.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parenthesesLzmaUtil.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parenthesesThreads.cF:\VC98\INCLUDE\rpcasync.h(45) : error C2220: warning treated as error – no object file generatedF:\VC98\INCLUDE\rpcasync.h(45) : warning C4115: '_RPC_ASYNC_STATE' : named type definition in parenthesesGenerating Code…Error executing cl.exe.原因是_RPC_ASYNC_STATE结构体的定义在引用了它的后面，定位到_RPC_ASYNC_STATE定义部分VC98\Include\RPCASYNC.H，查看定义源码如下：
typedefenum _RPC_ASYNC_EVENT {RpcCallComplete,RpcSendComplete,RpcReceiveComplete} RPC_ASYNC_EVENT;typedef void RPC_ENTRYRPCNOTIFICATION_ROUTINE (struct _RPC_ASYNC_STATE *pAsync,<span style="white-space:pre"></span>//这里使用了这个结构体，，但是其定义在后面void *Context,RPC_ASYNC_EVENT Event);typedef RPCNOTIFICATION_ROUTINE *PFN_RPCNOTIFICATION_ROUTINE;typedef struct _RPC_ASYNC_STATE {unsigned int Size; // size of this structureunsigned long Signature;long Lock;unsigned long Flags;void*StubInfo;void*UserInfo;void*RuntimeInfo;RPC_ASYNC_EVENT Event;RPC_NOTIFICATION_TYPES NotificationType;union {//// Notification by APC//struct {PFN_RPCNOTIFICATION_ROUTINE NotificationRoutine;HANDLE hThread;} APC;//// Notification by IO completion port//struct {HANDLE hIOPort;DWORD dwNumberOfBytesTransferred;DWORD dwCompletionKey;LPOVERLAPPED lpOverlapped;} IOC;//// Notification by window message//struct {HWND hWnd;UINT Msg;} HWND;//// Notification by event//HANDLE hEvent;//// Notification by callback function//// This option is available only to OLE//PFN_RPCNOTIFICATION_ROUTINE NotificationRoutine;} u;long Reserved[4];} RPC_ASYNC_STATE, *PRPC_ASYNC_STATE;
解决方案：
加上前置声明：struct _RPC_ASYNC_STATE。
当我要取的时候，你淘气的躲开了，
