FindFirstStreamW() and FindNextStreamW() to get all file streams

This is a discussion on FindFirstStreamW() and FindNextStreamW() to get all file streams within the Windows Programming forums, part of the Platform Specific Boards category; Hello All, I am using FindFirstStreamW() and FindNextStreamW() to iterate over all file streams and get the name and size. ...

  1. #1
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    FindFirstStreamW() and FindNextStreamW() to get all file streams

    Hello All,

    I am using FindFirstStreamW() and FindNextStreamW() to iterate over all file streams and get the name and size.
    However, it returns on the data stream and alternate data streams and skips all other.

    BackupRead() used on the same file returns the above along with object identifiers and security data.
    Why is this and how can I get all streams without using BackupRead() ?

    Below is the code :
    Code:
    #include<stdio.h>
    #include<windows.h>
    #include<winbase.h>
    #include<stdlib.h>
    
    void FindAllStreams(HANDLE file)
    {
    	void *buffer;
    	int err;
    
    	WIN32_FIND_STREAM_DATA stream;
    	while(1)
    	{	
    		err = FindNextStreamW(file, &stream);
    		if(err == 0)
    		{
    			if (GetLastError() == ERROR_HANDLE_EOF)
    				printf("\nNo more streams available\n");
    			else
    				printf("error = 0x%x\n", GetLastError());
    			
    			break;
    		}
    		else
    		{
    			printf("StreamSize   = 0x%x\n", stream.StreamSize.QuadPart);
    			wprintf(L"StreamName = %s\n",   stream.cStreamName);
    		}
    	}
    }
    
    
    
    int wmain(int argc, wchar_t *argv[])
    {
        HANDLE file;
    	WIN32_FIND_STREAM_DATA stream;
    
        {    
            file = FindFirstStreamW(argv[1], FindStreamInfoStandard, &stream, 0);
            if (file == INVALID_HANDLE_VALUE)
            {
                printf("Could not crerate file handle\n");
                printf("error = 0x%x\n", GetLastError());
            }
            else
            {   
    			printf("\nStreamSize   = 0x%x\n", stream.StreamSize.QuadPart);
    			wprintf(L"StreamName = %s\n\n",   stream.cStreamName);
    
    			FindAllStreams(file);			
                FindClose(file);
            }        
        }
    
        return 0;
    }
    Thanks

  2. #2
    and the hat of wrongness Salem's Avatar
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    > err = FindNextStreamW(file, &stream);
    How does this even compile, when stream is a local variable in another function?

    Or better yet, why aren't FindFirst / FindNext in the same function?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
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    Code:
    err = FindNextStreamW(file, &stream);
    here stream is declared in the same function
    Code:
    void FindAllStreams(HANDLE file)
    
    WIN32_FIND_STREAM_DATA stream;

  4. #4
    and the hat of wrongness Salem's Avatar
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    was it initialised by findfirst?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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