uincode char array to array<unsigned char,1>^

This is a discussion on uincode char array to array<unsigned char,1>^ within the Windows Programming forums, part of the Platform Specific Boards category; As the topic describes I need to convert unicode char array to array<unsigned char,1>^ Code: if ( saveFileDialog1->ShowDialog() == ::DialogResult::OK ...

  1. #1
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    uincode char array to array<unsigned char,1>^

    As the topic describes I need to convert unicode char array to array<unsigned char,1>^
    Code:
    if ( saveFileDialog1->ShowDialog() == ::DialogResult::OK )
          {
             if ( (myStream = saveFileDialog1->OpenFile()) != nullptr )
             {
    			array<String^>^ stringArray;
    			array<unsigned char,1>^ charArray; 
    			stringArray=this->input->Split('\n');
    			
    			for (int index=0;index<=stringArray->Length;index++){
    				
    				charArray=(array<unsigned char, 1>^)stringArray[index]->ToCharArray();//I get a cast exception here.
    				myStream->Write(charArray,0,charArray->Length);
    			}
    			
    				filename = saveFileDialog1->FileName;
                myStream->Close();
             }
          }
    I also tried marshalling the stringArray[index] to a std::string and using c_str() but that didn't work either.

  2. #2
    Registered User C_ntua's Avatar
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    Wondering. Wouldn't
    Code:
    myStream->Write(stringArray[index]->toCharArray(), 0 , charArray->Length);
    simply work?

    As for why it throws an exception, look here. I guess wchar_t is different from unsigned char?

    Didn't really know that they were casting exceptions for C-style casting...
    Last edited by C_ntua; 12-14-2009 at 08:49 AM.

  3. #3
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    Wondering. Wouldn't
    Code:
    myStream->Write(stringArray[index]->toCharArray(), 0 , charArray->Length);
    simply work?

    As for why it throws an exception, look here. I guess wchar_t is different from unsigned char?

    Didn't really know that they were casting exceptions for C-style casting...
    No Write takes array<unsigned char,1>^ not array<w_char>^ of the ToCharArray method. I think w_char are to byte unicode charachters, unsigned char is ascii 1 byte charachters the same as a byte array.

    I'm just learning about these types so if I have this incorrect please respond and let me know.

    That said I still need the correct conversion.

    If there is a work around that would be good. What I'm trying to do is write the contents from the existing file to the new file specified in the save dialog.

  4. #4
    Registered User C_ntua's Avatar
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    [sigh]
    Last edited by C_ntua; 12-14-2009 at 10:17 AM.

  5. #5
    Registered User C_ntua's Avatar
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    I edited my post and deleted my main point and in general mixed everything...

    wchar_t should be 2 bytes. I believe they depend in general. Anyhow.

    My main point is: ignore the exception. I don't know why it throws it (or by exception you mean compiler warning?). Maybe you could try a C++ cast. It is always better to do so anyway:
    Code:
    charArray = static_cast< array<unsigned char, 1>^ >(stringArray[index]->ToCharArray());
    What you do should work, there is nothing wrong logically with it.

    EDIT: Actually, this conversions are not that simply and should not be done. A solution would be to copy the values stringArray to the charArray, though not the most efficient way.
    The reason why this might not work is that the types are completely different for the compiler.

    Will look more how to cast one template class to another
    Last edited by C_ntua; 12-14-2009 at 10:22 AM.

  6. #6
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    I managed a work around by avoiding the use of System::IO::Stream and the write method. Instead I did this:
    Code:
    if ( saveFileDialog1->ShowDialog() == ::DialogResult::OK )
    				 {
    					 writer = gcnew System::IO::StreamWriter(saveFileDialog1->FileName,false);
    					 {
    						 array<String^>^ stringArray;
    						 //array<unsigned char,1>^ charArray; 
    						 stringArray=this->input->Split('\n');
    
    						 for (int index=0;index<=stringArray->Length-1;index++){
    
    							 //charArray=(array<unsigned char, 1>^)stringArray[index]->ToCharArray();
    							 writer->WriteLine(stringArray[index]);
    						 }
    
    						 filename = saveFileDialog1->FileName;
    						 writer->Close();writer = nullptr;
    					 }
    				 }

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