COM/ATL项目 [英] COM/ATL project

问题描述

为了列出文件夹中的文件名:

In order to list the filenames from folder:

FileName(BSTR path,BSTR* Retname, LONG* counter)
{
      WIN32_FIND_DATA FindData;
      HANDLE FindHandle = FindFirstFile(path, &FindData);
      BSTR Filelist[1000];
      int i=0;
       
      if (FindHandle  != INVALID_HANDLE_VALUE)
        {
            
           do
            {   
                
                 Filelist[i]= FindData.cFileName;
                *Retname++=Filelist[i];
                ++(*counter);
                   
                                           
            }   while (FindNextFile(FindHandle, &FindData) != 0);
                
                FindClose(FindHandle);
      }

这是创建组件时给出的函数定义... 在客户端:

this is the function definition given while creating the component... In the client side :

BSTR *Retname;
BSTR Filelist[1000];
long count = 0;
long *counter ;
counter = &count;
Retname=Filelist;

 hr=pIfiles->FileName(L"C:\\Dynamiclinklibrary\\text\\*.txt",Filelist,&count);

 std::cout<<"Number of files in a folder : " << count << std::endl<< std::endl;



 for(int i =0;i < count ;i++)
  {

      std::cout <<"filenames are: " <<Filelist<< std::endl;
      //Retname++;


  }

在运行时仅获取文件名的地址，而未获取文件名..我做了什么错误..请帮助..

while running im getting only the address of the filenames ,im not getting the filenames ..what mistake i ve done..please help..

推荐答案

ostream<<操作员不知道如何解密BSTR，因此它将BSTR视为一个整数并输出您看到的地址.将它们强制转换为char *(如果使用UNICODE，则将其转换为wchar_t)

The ostream << operator does not know how to decipher a BSTR so it treats it as an int and outputs the addresses that you are seeing. Cast them to a char* (or wchar_t if using UNICODE)

首先:格式化您的问题！没有人愿意读这个问题.如果只是将其作为文本和代码的随机组合发布.

First of all: format your question! No one will bother to read the question if you just post it as a random mix of text and code. 

其次，在COM/ATL问题中，也最好发布* .idl文件内容.

Secondly in a COM/ATL question it might be a good idea to also post your *.idl file contents.

最后看一下您的代码，我想到一件事:BSTR应该在服务器端分配，并在客户端释放.查看:SysAllocString和SysFreeString.

And finally looking at your code one thing pops to mind: BSTR should be allocated on the server side and freed on the client side. Look at: SysAllocString and SysFreeString.

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