c++ - 如何在 C++ 中将 std::wstring 转换为 LPCTSTR？

Question

我有 wstring 格式的 Windows 注册表项值。现在我想将它传递给这段代码(第一个参数 - javaw.exe 的路径):

std::wstring somePath(L"....\\bin\\javaw.exe");

    if (!CreateProcess("C:\\Program Files\\Java\\jre7\\bin\\javaw.exe", <--- here should be LPCTSTR, but I have a somePath in wstring format..
            cmdline, // Command line.
            NULL, // Process handle not inheritable.
            NULL, // Thread handle not inheritable.
            0, // Set handle inheritance to FALSE.
            CREATE_NO_WINDOW, // ON VISTA/WIN7, THIS CREATES NO WINDOW
            NULL, // Use parent's environment block.
            NULL, // Use parent's starting directory.
            &si, // Pointer to STARTUPINFO structure.
            &pi)) // Pointer to PROCESS_INFORMATION structure.
    {
        printf("CreateProcess failed\n");
        return 0;
    }

我该怎么做？

Answer 1

只需使用std::w/string的c_str函数即可。

看这里:

http://www.cplusplus.com/reference/string/string/c_str/

std::wstring somePath(L"....\\bin\\javaw.exe");

    if (!CreateProcess(somePath.c_str(),
            cmdline, // Command line.
            NULL, // Process handle not inheritable.
            NULL, // Thread handle not inheritable.
            0, // Set handle inheritance to FALSE.
            CREATE_NO_WINDOW, // ON VISTA/WIN7, THIS CREATES NO WINDOW
            NULL, // Use parent's environment block.
            NULL, // Use parent's starting directory.
            &si, // Pointer to STARTUPINFO structure.
            &pi)) // Pointer to PROCESS_INFORMATION structure.
    {
        printf("CreateProcess failed\n");
        return 0;
    }