#define MAX_NUM_BUF 96

typedef struct _head
{
TCHAR type;//类型
unsigned short len;
}hdr, *phdr;

//数据包中的数据结构
typedef struct _data
{
TCHAR m_Name[MAX_NUM_BUF];
TCHAR m_Password[MAX_NUM_BUF];
}DATABUF, *pDataBuf;
<1>client端
#define Packet_Type_CleintInfo 'C'
#define Packet_Type_EXIT 'E'
#define HEADERLEN sizeof(hdr)

void CClientDlg::OnBnClickedBtnSendMsg() //要么这里出现了问题，要么是在服务端接收数据那里出现了问题
{
CString strName, strPassword;
GetDlgItemText(IDC_EDIT_NAME, strName);
GetDlgItemText(IDC_EDIT_PWD, strPassword);
if (strName.IsEmpty() || strPassword.IsEmpty())
{
AfxMessageBox(_T("is not empty!"));
return;
}
int NameLen = strName.GetLength()*sizeof(TCHAR);
int PasswordLen = strPassword.GetLength()*sizeof(TCHAR);

DATABUF CleintInfo;
ZeroMemory(&CleintInfo, sizeof(DATABUF));
memcpy_s(CleintInfo.m_Name, NameLen, strName.GetBuffer(), NameLen);
memcpy_s(CleintInfo.m_Password, PasswordLen, strPassword.GetBuffer(), PasswordLen);

hdr DataHeader;
//定义包头内容
DataHeader.type = Packet_Type_CleintInfo;
DataHeader.len =  sizeof(CleintInfo); //这里只设置了包括了包体，不是设置的整个数据包的长度（即包头+包体）

TCHAR m_SendBuf[1024] = {0};
memcpy_s(m_SendBuf, HEADERLEN, &DataHeader, HEADERLEN);

memcpy_s(m_SendBuf + HEADERLEN, sizeof(CleintInfo), &CleintInfo, sizeof(CleintInfo));

m_ClientSocket->Send((char*)m_SendBuf, HEADERLEN + sizeof(CleintInfo), 0);
}
<2>server端
#define MAX_SIZE_BUF 1024
#define HEADERLEN sizeof(hdr)
void CSocketServerDlg::OnReceive()  //要么这里出现了问题，要么是在客户端发送按钮函数里出现了问题
{
TCHAR szRecvBuf[MAX_SIZE_BUF] = {0};
int iRecvNum = m_ClientSocket->Receive((char*)szRecvBuf, MAX_SIZE_BUF, 0);

hdr DataHeader;
DATABUF CleintInfo;

if (iRecvNum > HEADERLEN)
{
ZeroMemory(&DataHeader, sizeof(DataHeader));
memcpy_s(&DataHeader, HEADERLEN, szRecvBuf, HEADERLEN);
if (DataHeader.type == 'C')
{
memcpy_s(&CleintInfo, sizeof(CleintInfo), szRecvBuf + HEADERLEN, sizeof(CleintInfo));
//ShowMsg(CleintInfo.m_Name);
//ShowMsg(CleintInfo.m_Password);
MessageBox(CleintInfo.m_Name);
MessageBox(CleintInfo.m_Password);
}
}
}

我是想把客户端的用户名和密码发送到服务端，但是服务端弹出的对话框都是空，就意味着收到的数据为空。。不知道哪里写错了，求高人指点。谢谢！！！

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