将CRC32合并到我的C ++项目中 [英] incorporate CRC32 in my C++ project

问题描述

我是c ++编程语言的新手，我被分配了一个项目，该语言是可视c ++.
该项目是关于编写程序以将数据从计算机(USB端口)传输到FT232R芯片的.我提供了ftd2xx驱动程序，其中包括一些非常简单的函数，即FT_Open()，FT_Write()，FT_Close()，并且代码可以正确编译.我的第一个问题是我怎么知道此代码功能?请提供一些简单可行的方法.
我的演讲要求我将CRC32集成到此功能中，据我所知，CRC是一种防止错误的算法.我假设我需要在发送器端对数据进行编码，并在接收器端对其进行检查.这意味着我必须对双方都进行编程吗?这是真的吗?有什么好书或网络吗?

包含FT_Open代码.这是正确的吗?我的意思是它可以在实际的沟通过程中工作.谢谢大家.

Hi,i am new to c++ programming language and i was assigned a project,the language is visual c++.
The project is about writing a program to transfer data from a computer(USB port) to a FT232R chip. I was provided with ftd2xx driver, i include some really simple functions,namely FT_Open(),FT_Write(),FT_Close() and the code can compile without error. My first problem is how do I know this code functions? please provide some easy and feasible ways.
My lecture asked me to incorporate a CRC32 to this function, as far as I know, CRC is a error-preventing algorithm. I would assume that I need to encode the data at transmitter side and check it at receiver end. That means i have to program both side?is this true? is there any good books or web ?

FT_Open code is included for you. Is this correct,i mean does it work on real communication process. Thank you guys in advance.

private: System::Void btnSend_Click(System::Object^  sender, System::EventArgs^  e) {
    DWORD BytesWritten;
    char * TxBuffer;
    TxBuffer=GetCString(rtxData->Text);
    ftStatus=FT_Write(ftHandle,TxBuffer,sizeof(TxBuffer),&BytesWritten);
        if(ftStatus==FT_OK)
        {
            MessageBox::Show("Transmission successful");
        }
        else
        {
            MessageBox::Show("Transmission failed");
        }
         }

推荐答案

CRC32是一种错误检查算法，它不能防止错误.您必须在发送方生成CRC32，并将其与数据一起打包在标头中，而在接收方，必须再次在给定的数据上生成并与标头进行比较.

crc32源

CRC32 is a error checking algorithm, it does not prevent errors. You have to generate a CRC32 on your sender side and pack it in a header with your data, and on the receiving side you have to generate again on the data given and compare with the header.

crc32 source

CRC是错误检测(不是预防")机制，请参见维基百科的CRC" ["C语言中的CRC实现代码" [ ^ ]有趣( ''指向免费提供的CRC32源代码的链接).

关于您的函数，(至少)有一个错误:sizeof(TxBuffer)总是返回字符点的大小(例如，在32位计算机上的4)，而不是数据缓冲区的实际大小.

CRC is a error detecting (not ''preventing'') mechanism, please see "CRC at Wikipedia"[^]. You may find: "CRC Implementation Code in C"[^] interesting (there''s a link to freely available CRC32 source code).

As about your function, there is (at least) one mistake: sizeof(TxBuffer) always returns the size of a character point (e.g. 4 on a 32 bit machine) and not the actual size of the data buffer.

谢谢大家.
通过使用sizeof(TxBuffer)，我想获取要写入设备的字节数，而不是缓冲区的大小.

Thanks to you all.
By using sizeof(TxBuffer) , I want to get the number of bytes to write into the device,not the size of the buffer.

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