isEqual: 首先判断两个对象是否类型一致, 再判断具体内容是否一致,如果类型不同直接return no.如先判断是否都是 NSString,在判断string的内容。 isEqualToString: 直接判断字符串内容,当然你要确保比较的对象保证是字符串。 == 直接比较指向的地址。
return ([[self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]length] == 0); } @end chown 另一个选择是使用isEqualToString检查是否等于@"",就像这样: 1 2 3 4 5 if ([myString isEqualToString:@""]) { NSLog(@"myString IS empty!"); } else { NSLog(@"m...
include(CheckIPOSupported) check_ipo_supported(RESULT ipo_supported) if(ipo_supported) set(CMAKE_INTERPROCEDURAL_OPTIMIZATION True) endif() 正如你所见,我们不得不包含一个内置模块来获取check_ipo_supported()命令的访问权限。 检查支持的编译器功能 如我们之前讨论的,如果我们的构建失败,最好是早点失败,这样...
Message(const std::string &m) : message_(m) {} friend std::ostream &operator<<(std::ostream &os, Message &obj) { return obj.printObject(os); } private: std::string message_; std::ostream &printObject(std::ostream &os); }; std::string getUUID(); 这是Message.cpp中相应的实现: ...
if(<variable|string> PATH_EQUAL <variable|string>) CMake 版本要求:大于等于3.24 如果这个元素在列表中返回True,否则返回False。 关于路径的比较其实就是另个字符串的比较,如果路径格式书写没有问题也可以通过下面这种方式进行比较[STREQUAL]: if(<variable|string>STREQUAL<variable|string>) ...
String^ message = gcnew String("Test String to Marshal");constchar* result; result = marshal_as<constchar*>( message );return0; } 範例:使用者定義已被取代的函式 當您不再建議使用特定函式時,您可以在自己的程式碼中使用deprecated屬性來警告呼叫者。 在此範例中,C4996 會在兩個位置產生:一個在宣...
fputs() — Write a string fputwc() — Output a wide-character fputws() — Output a wide-character string fread() — Read items __freadable() — Determine if a stream is open for reading __freadahead() — Retrieve number of bytes remaining in input buffer __freading() — Det...
To improve security, the connection string is now stored encrypted and is decrypted only as needed; it can't be returned as plain text. The string can be obtained by using the CDatabase::Dump method. Signature of CWnd::OnPowerBroadcast is changed. The signature of this message handler is ...
The public key must be a hexadecimal character string in the public key encoding format, and generated by the client software that supports SSH. For detailed operations, see the SSH client software help. You must enter the RSA, DSA, or ECC public key on the device that works as the SSH ...
tperrordetail() returns an integer which is then used as an argument to tpstrerrordetail() to retrieve a pointer to a string that contains the error message. The pointer can then be used as an argument to userlog or to fprintf()....