Question

我试图在Windows上为应用程序创建横幅。

// C Libraries:
#include <string>
#include <iostream>
#include <algorithm>

// Namespaces:
using namespace std;

const char *BANNER[] = R"BANNER(
             .-') _                              .-')
           (  OO) )                            ( OO ).
 ,--. ,--.  /     '._ ,-.-')  ,--.      ,-.-') (_)---\_)
 |  | |  |  |'--...__)|  |OO) |  |.-')  |  |OO)/    _ |
 |  | | .-')'--.  .--'|  |  \ |  | OO ) |  |  \\  :` `.
 |  |_|( OO )  |  |   |  |(_/ |  |`-' | |  |(_/ '..`''.)
 |  | | `-' /  |  |  ,|  |_.'(|  '---.',|  |_.'.-._)   \
('  '-'(_.-'   |  | (_|  |    |      |(_|  |   \       /
 `-----'      `--'    `--'    `------'  `--'    `-----')BANNER";

char* getCmdOption(char ** begin, char ** end, const std::string & option)
{
    char ** itr = find(begin, end, option);
    if (itr != end && ++itr != end)
    {
        return *itr;
    }
    return 0;
}

bool cmdOptionExists(char** begin, char** end, const std::string& option)
{
    return find(begin, end, option) != end;
}

int main(int argc, char * argv[])
{
    printf("%s\n", BANNER);

    if(cmdOptionExists(argv, argv+argc, "-h"))
    {
        cout << "Help Menu";
    }


    if (cmdOptionExists(argv, argv + argc, "-a"))
    {
        cout << "Adobe";
    }

    return 0;
}

我已经阅读了多个线程和多个网站，您可以使用语法R"(<string here>)";或R"BANNER(<string here>)BANNER";来创建多行字符串。但是，当我编译此代码时，我收到以下错误：

utilis.cpp(9) : error C2001: newline in constant
utilis.cpp(9) : error C2065: 'R' : undeclared identifier
utilis.cpp(9) : error C2143: syntax error : missing ';' before 'string'
utilis.cpp(9) : error C2059: syntax error : 'string'
utilis.cpp(10) : error C2015: too many characters in constant
utilis.cpp(10) : error C2059: syntax error : ')'
utilis.cpp(11) : error C2059: syntax error : ')'
utilis.cpp(12) : error C2015: too many characters in constant
utilis.cpp(12) : error C2059: syntax error : ')'
utilis.cpp(12) : warning C4129: '_' : unrecognized character escape sequence
utilis.cpp(12) : error C2001: newline in constant
utilis.cpp(12) : error C2015: too many characters in constant
utilis.cpp(13) : error C2015: too many characters in constant
utilis.cpp(13) : error C2059: syntax error : ')'
utilis.cpp(13) : error C2059: syntax error : ')'
utilis.cpp(14) : warning C4129: ' ' : unrecognized character escape sequence
utilis.cpp(14) : error C2001: newline in constant
utilis.cpp(14) : error C2015: too many characters in constant
utilis.cpp(15) : error C2018: unknown character '0x60'
utilis.cpp(15) : error C2015: too many characters in constant
utilis.cpp(15) : error C2018: unknown character '0x60'
utilis.cpp(15) : error C2137: empty character constant
utilis.cpp(16) : error C2018: unknown character '0x60'
utilis.cpp(16) : error C2015: too many characters in constant
utilis.cpp(17) : error C2015: too many characters in constant
utilis.cpp(17) : warning C4129: ' ' : unrecognized character escape sequence
utilis.cpp(17) : error C2001: newline in constant
utilis.cpp(17) : error C2015: too many characters in constant
utilis.cpp(18) : error C2018: unknown character '0x60'
utilis.cpp(18) : error C2015: too many characters in constant
utilis.cpp(18) : error C2018: unknown character '0x60'
utilis.cpp(18) : error C2015: too many characters in constant
utilis.cpp(18) : error C2018: unknown character '0x60'
utilis.cpp(18) : error C2015: too many characters in constant
utilis.cpp(18) : error C2001: newline in constant
utilis.cpp(21) : error C2143: syntax error : missing ')' before '{'
utilis.cpp(21) : error C2143: syntax error : missing ';' before '{'
utilis.cpp(21) : error C2447: '{' : missing function header (old-style formal list?)

对于无法创建多行字符串的问题，我做错了什么？

我也尝试过：cout << BANNER并获得相同的输出。对我来说，to many characters in constant错误没有意义，因为我看过比我大的横幅，例如见here。

Answer 1

问题是你放[]

 const char *BANNER[] = R"BANNER(

应该是

const char *BANNER = R"BANNER(

另外，使用C ++ 11或更高版本。使用带有-std=c++11的g ++为我工作。

C ++多行字符串无法按预期工作

1 个答案: