c++ - 如何解析 "invalid operands of types ' const char [ ]' and ' const char *' to binary ' operator +' "

Question

我使用 Qt Creator 和这段代码:

string execpath = "";
execpath += (QCoreApplication::applicationDirPath()).toStdString();
WinExec("ffmpeg -f dshow -t 32 -i audio=\"virtual-audio-capturer\" -y "+(execpath.c_str())+"\\sound.mp3", SW_HIDE); // Loopback captured in sound.mp3

在第 3 行生成此问题:

invalid operands of types 'const char [60]' and 'const char*' to binary 'operator+'

如何解决？

Answer 1

你会想要这样的东西:

execpath += (QCoreApplication::applicationDirPath()).toStdString();
std::string cmd = "ffmpeg -f dshow -t 32 -i audio=\"virtual-audio-capturer\" -y "
WinExec((cmd +execpath +"\\sound.mp3").c_str(), SW_HIDE);