how to convert char * to TMemorystream * type?

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1.how to save char * to a image file?
2.how to convert char * to TMemorystream * type?

C++

void process(char* data, int length)
{
   //the data is a image
}

I have try follow code,but display a blank photo.

C++

TMemoryStream * MemoryImageStream=new TMemoryStream;
  MemoryImageStream->Position=0;
  MemoryImageStream->Write(photo,len);

Posted 24-Jun-14 21:23pm

gzdreamway

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Jochen Arndt 25-Jun-14 4:28am

What kind of image data do you have?
What kind of image file do you want to save?
Image files usually have a header containing information of the image followed by the image data.
So you have to create the header, convert the data if necessary, and write header and data to file.

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Michael Haephrati · Answer 1 · 2014-06-29T09:25:00

You need to assign the appropriate size to the TMemoryImageStream object.

Instead of:

C++

TMemoryStream * MemoryImageStream=new TMemoryStream;
    MemoryImageStream->Position=0;
    MemoryImageStream->Write(photo,len);

change it to:

C++

TMemoryStream * MemoryImageStream=new TMemoryStream(len);
    MemoryImageStream->Position=0;
    MemoryImageStream->Write(photo,len);

See also:
http://msdn.microsoft.com/en-us/library/system.io.memorystream.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1[^]