c++ - _popen 使用引号时工作不正确

Question

我有一段这样的代码:

FILE * file = _popen("\"d:\\a b\\sql.exe\" \"d:\\a b\\la.db\"", "r");
_pclose(file);

它不能运行并返回结果:

'd:\a' is not recognized as an internal or external command, operable program or batch file.

But when I change quotation " to ' at second paramester => It's OK

\"d:\\a b\\la.db\"" =>  \'d:\\a b\\la.db\'"

FILE * file = _popen("\"d:\\a b\\sql.exe\" \'d:\\a b\\la.db\'", "r");
_pclose(file);

我希望 _popen 像 cmd.exe 一样工作。那么，我该如何处理这种情况。

Answer 1

尝试在空格前加一个反斜杠。我刚刚编写了这个代码片段(我有一个名为 popen.exe 的文件，它只打印“test”)并且它似乎可以工作。

#include <cstdio>
#include <cstdlib>

int main()
{
    FILE * pFile;
    char buffer[100];

    pFile = _popen("\"C:\\test\ 1\\popen.exe\"", "r");
    if (pFile == NULL) perror("Error opening file");
    else
    {
        while (!feof(pFile))
        {
            if (fgets(buffer, 100, pFile) == NULL) break;
            fputs(buffer, stdout);
        }
        _pclose(pFile);
    }
    return 0;
}