C++ .h檔案

VIDEO_DLL_API int __cdecl PlatformQueryRes(char* pcSvrIpAddress, char *pcLoginUserName, char** ppcResult);

C++ .cpp檔案

int __cdecl PlatformQueryRes(char* pcSvrIpAddress, char *pcLoginUserName, char** ppcResult)
{
 if (!g_Global.m_bInitPlatformSDKFlag)
 {
  return Platform_ErrUnInit;
 }
 if (NULL == pcSvrIpAddress || NULL == pcLoginUserName || NULL == ppcResult)
 {
  return Platform_ErrInvalidParam;
 }
 string sResult;
 PlatformBase_ptr ptrPlatformBase = g_Global.GetPlatformObject(pcSvrIpAddress);
 if (ptrPlatformBase.get())
 {
  int iResult;
  iResult = ptrPlatformBase->QueryRes(pcLoginUserName, sResult); 
  if (iResult == Platform_ErrSuccess)
  {
   strcpy(*ppcResult, (char*)sResult.c_str());  
  }
  if (iResult == Platform_ErrQueryFail)
  {
   strcpy(*ppcResult, ""); 
  }
  return iResult;
 }else
 {
  return Platform_ErrQueryFail;
 }
}
 

C# .cs檔案

public extern static int PlatformQueryRes(byte[] pcSvrIpAddress, byte[] pcLoginUserName, ref StringBuilder ppcResult);  

ref StringBuilder與char**相對應。

C#呼叫C++ DLL 傳出字串時，C++ DLL相應介面的傳出字串引數為char**。