程序如下:
#include"..\common\initsock.h"
#include<windows.h>
#include<stdio.h>
LPWSAPROTOCOL_INFO GetProvider(LPINT lpnTotalProtocols)
{
DWORD dwSize=0;
LPWSAPROTOCOL_INFO pProtoInfo=NULL;
//取得需要的緩衝區長度
if(::WSAEnumProtocols(NULL,pProtoInfo,&dwSize)==SOCKET_ERROR)
{
if(::WSAGetLastError()!=WSAENOBUFS)
return NULL;
}
//申請緩衝區,再次調用WSAEnumEnuProtocols函數
pProtoInfo=(LPWSAPROTOCOL_INFO)::GlobalAlloc(GPTR,dwSize);
*lpnTotalProtocols=::WSAEnumProtocols(NULL,pProtoInfo,&dwSize);
//return pProtoInfo;
}
void FreeProvider(LPWSAPROTOCOL_INFO pProtoInfo)
{
::GlobalFree(pProtoInfo);
}
CInitSock theSock;
void main()
{
int nTotalProtocols;
LPWSAPROTOCOL_INFO pProtoInfo=GetProvider(&nTotalProtocols);
if(pProtoInfo!=NULL)
{
//打印出各個提供者的協議信息
for(int i=0;i<nTotalProtocols;i++)
{
printf(" Protocol: %s\n",pProtoInfo[i].szProtocol);
printf("CatalogEntryId: %d ChainLen: %d\n\n",
pProtoInfo[i].dwCatalogEntryId,pProtoInfo[i].ProtocolChain.ChainLen);
}
}
}
運行程序出現這樣的提示:
WSAEnumProtocols.exe已停止工作
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調試程序
即如下:
原因是:該LPWSAPROTOCOL_INFO GetProvider(LPINT lpnTotalProtocols)函數沒有返回值,仔細看上面,你會發現 return語句被我註釋掉了的
解決:將LPWSAPROTOCOL_INFO GetProvider(LPINT lpnTotalProtocols)函數中語句//return pProtoInfo;改爲return pProtoInfo;