C++复制文件（使用WindowsAPI）

bool TForm1::CopyFile2() {
    AnsiString srcPath = ExtractFilePath(Application->ExeName) + "Windows.pdf";
    AnsiString destPath = ExtractFilePath(Application->ExeName) + "dest.pdf";

    HANDLE hSrcFile, hDestFile;
    hSrcFile = CreateFile(srcPath.c_str(),     // open MYFILE.TXT
              GENERIC_READ,              // open for reading
              FILE_SHARE_READ,           // share for reading
              NULL,                      // no security
              OPEN_EXISTING,             // existing file only
              FILE_ATTRIBUTE_NORMAL,     // normal file
              NULL);                     // no attr. template
    if (hSrcFile == INVALID_HANDLE_VALUE)
        return false;

    hDestFile = CreateFile(destPath.c_str(),           // create MYFILE.TXT
             GENERIC_WRITE ,                // open for writing
             0,                            // do not share
             NULL,                         // no security
             CREATE_ALWAYS,                // overwrite existing
             FILE_ATTRIBUTE_NORMAL,       // normal file
             NULL);
    if (hDestFile == INVALID_HANDLE_VALUE)
        return false;
    char* buffer = new char[1024];

    ULONG lpNumberOfBytesRead, lpNumberOfBytesWritten;
    DWORD fileSize, offset = 0;
    fileSize = GetFileSize(hSrcFile, NULL);
    if (fileSize == INVALID_FILE_SIZE)
        return false;
    while (offset < fileSize) {
        BOOL bFlag = ReadFile(hSrcFile, buffer, 1024, &lpNumberOfBytesRead, NULL);
        if (!bFlag) {
            return false;
        }
        WriteFile(hDestFile, buffer, 1024, &lpNumberOfBytesWritten, NULL);
        offset += 1024;
    }
    CloseHandle(hSrcFile);
    CloseHandle(hDestFile);
    delete[] buffer;
    return true;
}