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我正在尝试制作文件的副本。

此代码运行没有错误，但复制的文件不完整：

#include <iostream>
#include <filesystem>

using namespace std;

int main()
{
    error_code ec;
    filesystem::copy_file(
        "C:/ProgramData/spectronix/oximeter/spectrumalpha.dat",
        "C:/ProgramData/spectronix/oximeter/test.dat", ec );
    cout << ec.value() << "\n";
    return 0;
}

样品运行：

C:\ProgramData\spectronix\oximeter>dir
 Volume in drive C is OS
 Volume Serial Number is 86AE-5DBA

 Directory of C:\ProgramData\spectronix\oximeter

2020-04-03  04:36 PM    <DIR>          .
2020-04-03  04:36 PM    <DIR>          ..
2020-04-03  01:29 PM            24,576 spectrum.dat
2020-03-23  12:27 PM           131,072 spectrumalpha.dat
2020-04-03  04:36 PM           963,072 test.exe
               3 File(s)      1,118,720 bytes
               2 Dir(s)  823,148,593,152 bytes free

C:\ProgramData\spectronix\oximeter>test
0

C:\ProgramData\spectronix\oximeter>dir
 Volume in drive C is OS
 Volume Serial Number is 86AE-5DBA

 Directory of C:\ProgramData\spectronix\oximeter

2020-04-03  04:37 PM    <DIR>          .
2020-04-03  04:37 PM    <DIR>          ..
2020-04-03  01:29 PM            24,576 spectrum.dat
2020-03-23  12:27 PM           131,072 spectrumalpha.dat
2020-04-03  04:37 PM             7,409 test.dat
2020-04-03  04:36 PM           963,072 test.exe
               4 File(s)      1,126,129 bytes
               2 Dir(s)  823,148,515,328 bytes free

请注意，原始文件有 131,072 字节，但复制的文件只有 7,409 字节。

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