IDevicePacketStream
更新:2007 年 11 月
藉由讀取及寫入實作 IPacket 的物件,與桌上型電腦上已連接的 DevicePacketStream 交換資料。
IDevicePacketStream : public IUnknown
方法
方法 |
說明 |
---|---|
讀取桌上型電腦上的 DevicePacketStream 所傳送的封包。 |
|
將封包寫入至資料流。封包是由桌上型電腦上的 DevicePacketStream 所讀取。 |
|
檢查資料流是否已連接。 |
|
中斷資料流的連接。 |
|
檢查封包是否可供讀取。 |
|
檢查是否已對資料流啟用 Nagle 的緩衝演算法。 |
|
啟用或停用資料流上,Nagle 的緩衝演算法。 |
|
取得基礎傳輸機制所限制的封包大小最大值。 |
備註
若要取得實作此介面的物件,請使用 IDeviceAgentTransport::AcceptConnectionEx。
範例
下列範例是一個裝置代理程式應用程式,會將一個封包寫入至桌面,並從該桌面讀取一個封包。
#include "stdafx.h"
// Custom implementation of IAgentTransportShutdownCallback
class MyShutdownCallback: public IAgentTransportShutdownCallback
{
private:
long ref;
public:
HRESULT STDMETHODCALLTYPE Shutdown(IUnknown *in_pUnknown)
{
// Add your cleanup code here
MessageBox(NULL,_T("conmanclient2 exited"),_T("conmanclient exited"),0);
return 0;
}
// Must implement members from IUnknown
HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid, void __RPC_FAR *__RPC_FAR *ppvObject)
{
return 0;
}
ULONG STDMETHODCALLTYPE AddRef( void)
{
return InterlockedIncrement(&ref);
}
ULONG STDMETHODCALLTYPE Release( void)
{
if(InterlockedDecrement(&ref) == 0)
{
delete this;
return 0;
}
return ref;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
// Load the Device Agent Transport Library
HINSTANCE hmod;
hmod = LoadLibrary(L"DeviceAgentTransport.dll");
// Get an instance of IDeviceAgentTransport
GetDeviceAgentTransportFunc f1 = (GetDeviceAgentTransportFunc)
::GetProcAddress(hmod, L"GetDeviceAgentTransport");
IDeviceAgentTransport *pTransport = NULL;
f1(&pTransport);
// Register the callback with the Device Agent Transport
MyShutdownCallback *shutdownCallback = new MyShutdownCallback();
pTransport->RegisterShutdownCallback(shutdownCallback,shutdownCallback);
// Let the desktop application know that this remote agent was deployed successfully
// and that this remote agent will handle the supplied list of services.
LPCOLESTR szServiceIds[] = {L"F85E57BA-5AE9-4FF7-8433-6AB7D991D033"};
pTransport->AcknowledgeLaunch(1, szServiceIds);
// Open a communcation stream with desktop application on the service.
IDevicePacketStream *pStream = NULL;
pTransport->AcceptConnectionEx(szServiceIds[0], &pStream);
// Get an instance of IPacket
GetNewPacketFunc f2 = (GetNewPacketFunc) :: GetProcAddress(hmod, L"GetNewPacket");
IPacket *pPacket = NULL;
f2(&pPacket);
// Write a message and sent the packet.
pPacket->WriteBool(true);
pPacket->WriteByte(0xff);
pPacket->WriteChar('c');
pPacket->WriteInt32(1024);
pPacket->WriteString(L"Hello Desktop Computer");
pStream->Write(pPacket);
// Check for a packet while communication stream is connected.
f2(&pPacket);
VARIANT_BOOL connected;
pStream->IsConnected(&connected);
while(connected)
{
pStream->IsConnected(&connected);
VARIANT_BOOL available;
// If a packet is found, display the string.
pStream->IsPacketAvailable(&available);
if(available)
{
pStream->Read(&pPacket);
VARIANT_BOOL endofpacket;
pPacket->IsEndOfPacket(&endofpacket);
while (!endofpacket)
{
pPacket->IsEndOfPacket(&endofpacket);
DataTypeEnum datatype;
pPacket->ReadDataType(&datatype);
switch (datatype)
{
case DT_BYTE:
BYTE byteValue;
pPacket->ReadByte(&byteValue);
break;
case DT_INT32:
INT32 intValue;
pPacket->ReadInt32(&intValue);
break;
case DT_WIDECHAR:
wchar_t charValue;
pPacket->ReadChar(&charValue);
break;
case DT_BOOL:
VARIANT_BOOL boolValue;
pPacket->ReadBool(&boolValue);
break;
case DT_BYTEARRAY:
BYTE * buffer[100];
ULONG length;
pPacket->ReadBytes(buffer,&length);
break;
case DT_STRING:
LPWSTR string;
pPacket->ReadString(&string);
MessageBox(NULL, string,string,0);
break;
default:
break;
}
};
}
};
return 0;
}
Managed 對應項
Microsoft.SmartDevice.DeviceAgentTransport.IDevicePacketStream
需求
DeviceAgentTransport.h