MS Visual c++ 2008 字符缓冲区比定义的长

发布于 2024-09-10 08:33:35 字数 474 浏览 5 评论 0原文

我有一个 char* 缓冲区来保存我以二进制模式读取的文件。我知道文件的长度是 70 字节，这是用于生成正确大小的缓冲区的值。问题是，数组中有 17 或 18 个额外空格，因此一些随机字符被添加到末尾。可能是 unicode 问题吗？

ulFLen 以字节为单位存储文件的大小并具有正确的值（我正在测试的文件为 70）

//Set up a buffer to store the file
pcfBuffer = new char[ulFLen];

//Reading the file
cout<<"Inputting File...";
fStream.seekg(0,ios::beg);
fStream.read(pcfBuffer,ulFLen);
if(!fStream.good()){cout<<"FAILED"<<endl;}else{cout<<"SUCCESS"<<endl;}

原文

I've got a char* buffer to hold a file that i read in binary mode. I know the length of the file is 70 bytes and this is the value being used to produce a buffer of the correct size. The problem is, there is 17 or 18 extra spaces in the array so some random characters are being added to the end. Could the be a unicode issue?

ulFLen stores the size of the file in bytes and has the correct value (70 for the file i'm testing on)

//Set up a buffer to store the file
pcfBuffer = new char[ulFLen];

//Reading the file
cout<<"Inputting File...";
fStream.seekg(0,ios::beg);
fStream.read(pcfBuffer,ulFLen);
if(!fStream.good()){cout<<"FAILED"<<endl;}else{cout<<"SUCCESS"<<endl;}

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小嗷兮 2024-09-17 08:33:35

由于它是一个 char 数组，您可能忘记了终止 NUL 字符。

在这种情况下，正确的方法是：

//Set up a buffer to store the file and a terminating NUL character
pcfBuffer = new char[ulFLen+1];

//Reading the file
cout<<"Inputting File...";
fStream.seekg(0,ios::beg);
fStream.read(pcfBuffer,ulFLen);
if(!fStream.good()){cout<<"FAILED"<<endl;}else{cout<<"SUCCESS"<<endl;}

// Add NUL character
pcfBuffer[ulFLen] = 0;

但请注意，对于依赖于它的例程，您只需要一个终止 NUL 字符，例如字符串例程或使用 %s 使用 printf 时。如果您使用的例程使用了已知长度（70 个字符）的事实，那么它也可以在没有 NUL 字符的情况下工作。

As it is a char array, you probably forgot a terminating NUL character.

The right way in this case would be:

//Set up a buffer to store the file and a terminating NUL character
pcfBuffer = new char[ulFLen+1];

//Reading the file
cout<<"Inputting File...";
fStream.seekg(0,ios::beg);
fStream.read(pcfBuffer,ulFLen);
if(!fStream.good()){cout<<"FAILED"<<endl;}else{cout<<"SUCCESS"<<endl;}

// Add NUL character
pcfBuffer[ulFLen] = 0;

But note that you only need a terminating NUL character for routines that depend on it, like string routines or when using printf using %s. If you use routines that use the fact that you know the length (70 characters), it will work without a NUL character, too.

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半窗疏影 2024-09-17 08:33:35

读取数据后添加以下代码片段，它将添加所需的终止零。

顺便说一句，它应该是 pcfBuffer = new char[ulFLen+1];

size_t read_count = fStream.gcount();
if(read_count<=ulFlen)
    pcfBuffer[read_count]=0;

无论需要读取多少数据（在您的情况下 gcount() 应该始终返回 70，因此您可以执行以下操作：pcfBuffer[70]=0;)

Add following snippet after the data has been read, it will add the terminating Zero which is needed.

And btw it should be pcfBuffer = new char[ulFLen+1];

size_t read_count = fStream.gcount();
if(read_count<=ulFlen)
    pcfBuffer[read_count]=0;

This will work no matter how much data has to be read (in your case gcount() should always return 70, so you could do following instead: pcfBuffer[70]=0;)

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