如何使用 system() 调用带有引号的参数的批处理文件

Question

For example, in the command line this works (the 1st argument has quotes but the 2nd argument doesn't): "test.bat" "a" b ie it know that "a" is the 1st argument and b is the second

but using system() it doesn't work: system("test.bat" "a" b)

this also doesn't work: system("test.bat" \\"a\\" b)

Answer 1

This is gonna be simplest if we use a raw string literal. A raw string literal is a way of writing a string in c++ where nothing gets escaped. Let's look at an example:

char const* myCommand = R"(test.bat "a" b)"; 

The R at the beginning indicates that it's a raw string literal, and if you call system(myCommand) , it will be exactly equivalent to typing

$ test.bat "a" b

into the command line. Now, suppose you want to escape the quotes on the command line:

$ test.bat \"a\" b

With a raw string literal, this is simple:

char const* myCommand = R"(test.bat \"a\" b)"; 
system(myCommand); 

Or, alternatively:

system(R"(test.bat \"a\" b)"); 

Hope this helps!

A bit more info on raw string literals: Raw string literals are a great feature, and they basically allow you to copy+paste any text directly into your program. They begin with R , followed by a quote and a parenthesis. Only the stuff inside the parenthesis gets included. Examples:

using std::string; 
string a = R"(Hello)";        // a == "Hello"

Begin and end with "raw":

string b = R"raw(Hello)raw";  // b == "Hello"

Begin and end with "foo"

string c = R"foo(Hello)foo";  // c == "Hello"

Begin and end with "x"

string d = R"x(Hello)x";      // d == "Hello"

The important thing is that we begin and end the literal with the same string of letters (called the delimiter), followed by the parenthesis. This ensures we never have a reason to escape something inside the raw string literal, because we can always change the delimiter so that it's not something found inside the string.

Answer 2

我现在让它工作：

system(R"(C:\"to erase\test.bat" "a")");

Answer 3

I found the answer: system("test.bat" ""a"" b);

or more precisely: system("\\"test.bat\\" ""a"" b");

So the answer is to escape the quotes with a double quote