本文讲述了如何用C++Builder实现Messenger的详细方法，其中使用了如下技术：
1. 多线程序技术，防止界面出现死锁。
2. 使用了网络枚举来枚举在线的网络用户。
3. 使用了Unicode的转换函数进从AnsiString到Unicode的转换。
4. 使用了简单的不规则窗口的技术。
5. 自动安装，将自己加入系统起动中。
6. 系统托盘技术。
编程方法：
1. 如图所示在窗体上加入的有的控件：TListView,TTreeView,TMemo,菜单、托盘、按钮、状态栏
2. 针对各控件按本文所写加入代码即可。
3. 以下是发送函数
void __fastcall TFormMain::ButtonSendClick(TObject *Sender)
{
AnsiString Message,UserName,FromName;
TListItem *ListItem;
if(CheckBoxAnony->Checked)FromName=EditAnony->Text;
else FromName="";
Message=Memo1->Text;
if(Message==""){ShowMessage("Please Enter words to send");return;}
if(!ListView1->SelCount){
if(TreeView1->Selected==NULL){ShowMessage("Please select destnation");return;}
UserName=TreeView1->Selected->Text;
if(TreeView1->Selected->Level==1)UserName=UserName+"*";
new NetMessageSend(false,UserName,FromName,Message,CheckBoxGetRet->Checked);
return;
}
ListItem=ListView1->Selected;
UserName=ListItem->Caption;
if(TreeView1->Selected->Level==0)UserName+="*";
while(UserName[1]=='\\')UserName=UserName.SubString(2,UserName.Length()-1);
new NetMessageSend(false,UserName,FromName,Message,CheckBoxGetRet->Checked);
for(int i=1;iSelCount;i++){
ListItem=ListView1->GetNextItem(ListItem,sdAll,TItemStates()< UserName=ListItem->Caption;
if(TreeView1->Selected->Level==0)UserName+="*";
while(UserName[1]=='\\')UserName=UserName.SubString(2,UserName.Length()-1);
new NetMessageSend(false,UserName,FromName,Message,CheckBoxGetRet->Checked);
}
} |
以下是网络结点枚举函数，是个线程
bool __fastcall EnumNetResource::GetNetRes(TTreeNodes *Nodes,TTreeNode * Node,NETRESOURCE *pNetResource,int Depth)
{
#define ENUMBUFSIZE (16*1024)
#define ENUMCOUNT 10
NETRESOURCE buff[1024];
AnsiString UserName;
if(Terminated) return false;
if(Nodes==NULL) return false;
if(Depth==0) return true;
HANDLE hEnum;
bool reValue=true;
NETRESOURCE *pNetRes,NetRes;
if(WNetOpenEnum(RESOURCE_GLOBALNET,RESOURCETYPE_ANY,0,
pNetResource,&hEnum)!=NO_ERROR)return false;
DWORD ECount=ENUMCOUNT;
DWORD ESize=ENUMBUFSIZE;
DWORD Error_num;
do{
Error_num=WNetEnumResource(hEnum,&ECount,buff,&ESize);
if (ESize>ENUMBUFSIZE) return false;
if (Error_num==NO_ERROR){
for (DWORD num=0;num if(Terminated)return false;
pNetRes=&buff[num];
file://if(Node)Node->ImageIndex=1-Depth;
UserName=AnsiString(pNetRes->lpRemoteName);
while(UserName[1]=='\\')UserName=UserName.SubString(2,UserName.Length()-1);
TTreeNode *tNode=Nodes->AddChild(Node,UserName);
if(tNode)
switch(pNetRes->dwType){
case RESOURCETYPE_ANY:
switch(tNode->Level){
case 0:tNode->ImageIndex=1;break;
case 1:
case 2:tNode->ImageIndex=2;break;
}
break;
case RESOURCETYPE_DISK:tNode->ImageIndex=3;break;
case RESOURCETYPE_PRINT:tNode->ImageIndex=4;break;
}
if(pNetRes->dwDisplayType!=RESOURCEDISPLAYTYPE_SHARE){
if(!GetNetRes(Nodes,tNode,pNetRes,Depth-1)) reValue=false;
}
}
}
}while(ECount==ENUMCOUNT);
if (Error_num!=ERROR_NO_MORE_ITEMS && Error_num!=NO_ERROR) reValue=false;
WNetCloseEnum(hEnum);
return reValue;
} |
以下是多线程发送函数，是个线程
void __fastcall NetMessageSend::Execute()
{
file://---- Place thread code here ----
const maxlen=1600;
wchar_t *pMsgBuff;
AnsiString retstr;
long int retvalue,msglen,sendlen;
msglen=FMessage.WideCharBufSize();
pMsgBuff=(wchar_t *)malloc(msglen*2+10);
FMessage.WideChar(pMsgBuff,msglen);
for(long int i=0;i if((msglen*2-i)>maxlen)sendlen=maxlen;
else sendlen=msglen*2-i;
retvalue=NetMessageBufferSend(NULL,FUserName,pFromName,(char *)pMsgBuff+i,sendlen);
}
if(FGetRet){
switch(retvalue){
case NERR_Success:
retstr="@_@ Sent OK!";
break;
case ERROR_ACCESS_DENIED:
retstr=":( Has no access";
break;
case ERROR_INVALID_PARAMETER:
retstr=":( Parameter error.";
break;
case ERROR_NOT_SUPPORTED:
retstr=":( Network not supported.";
break;
case NERR_NameNotFound:
retstr=":( Parameter is invalid.";
break;
case NERR_NetworkError:
retstr=":( General failure network hardware.";
break;
default:
retstr=":( Unknow error";
break;
}
Application->MessageBox(retstr.c_str(),("Result for "+AnsiString(FUserName)).c_str(),MB_OK);
}
free(pMsgBuff);
} |
本文代码在C++ Builder6.0，Windows2000专业版下实现。
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