如何将char *转换为TMemorystream *类型？ [英] how to convert char * to TMemorystream * type?

问题描述

1.如何将char *保存到图像文件中？

2.如何将char *转换为TMemorystream *类型？

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

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

我尝试按照代码，但显示空白照片。

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

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

推荐答案

您需要为TMemoryImageStream对象指定适当的大小。



而不是：

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

Instead of:

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

更改为：

change it to:

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

参见：

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

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