当我保存playingBoard
数组时,save
可以正确地打印它,但是当我尝试导入由save
创建的import
的文件时,我得到了奇怪的输出-空格被删除并替换为1
,没有明显的逻辑。 (下面提供了示例)
最小的可复制示例:
#include <iostream>
#include <fstream>
class Board
{
public:
char playingBoard[9][9];
Board()
{
for (unsigned char i = 0; i < 9; ++i)
for (unsigned char j = 0; j < 9; ++j)
playingBoard[i][j] = ' ';
}
bool import(std::string filename)
{
std::ifstream ifs {filename};
if (!ifs.is_open())
return false;
for (unsigned char i = 0; i < 9; ++i) {
for (unsigned char j = 0; j < 9; ++j) {
ifs >> playingBoard[i][j];
std::cout << playingBoard[i][j] << "|";
}
std::cout << std::endl;
}
ifs.close();
return true;
}
bool save(std::string filename) const
{
std::ofstream ofs {filename, std::ios::app};
if (!ofs.is_open())
return false;
for (unsigned char i = 0; i < 9; ++i) {
for (unsigned char j = 0; j < 9; ++j) {
ofs << playingBoard[i][j];
std::cout << playingBoard[i][j] << "|";
}
std::cout << std::endl;
}
ofs.close();
return true;
}
};
int main()
{
Board board;
board.import("filename");
std::cout << std::endl;
board.playingBoard[1][1] = '1';
board.save("filename");
}
输出(文件之前不存在,因此只有一个输出):
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|1| | | | | | | |
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第二次运行的输出:
1| | | | | | | | |
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1| | | | | | | | |
|1| | | | | | | |
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第三次运行的输出:
1|1|1| | | | | | |
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1|1|1| | | | | | |
|1| | | | | | | |
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答案 0 :(得分:6)
您的问题是,默认情况下,operator >>
会跳过空格。您需要使用另一种从文件中提取字符的方法,例如get
成员函数(以下示例,已通过gcc-9.3.0测试)。
bool import(std::string filename)
{
std::ifstream ifs {filename};
if (!ifs.is_open())
return false;
for (unsigned char i = 0; i < 9; ++i) {
for (unsigned char j = 0; j < 9; ++j) {
playingBoard[i][j] = ifs.get();
std::cout << playingBoard[i][j] << "|";
}
std::cout << std::endl;
}
输出:
$ ./a.out
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|1| | | | | | | |
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|1| | | | | | | |
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