incorporate CRC32 in my C++ project

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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");
        }
         }