c++builder-xe8

问题 I have an iOS static library (.a & .h file) and would like to know how to implement it into a C++ Builder project. The documentation cover's how to import a Java library in some detail but does not touch on a third party iOS library at all. Nor are there any blog posts or video's from Embarcadero about doing so. The closest post I have found is: Checking for an internet connection on mobile devices with Delphi XE5 However, it is not clear how to link in the .a file and then how to access the

问题 I am very new to C++ Builder XE8. I want the minimum and maximum length of numbers that must be typed is as much as six numbers, also I need to make sure that only number is entered (0 is exception), and not an alphabetic character, backspace, punctuation, etc. I would also like to produce an error box if anything other than a number is entered. I've tried a few combinations of codes, three of which can be seen below, but none of those codes works. Any help would sure be appreciated! (1).

问题 I have a method which builds a help message and then sets a TLabel 's text property to that help message. However, whenever I attempt to set the text of the label, I get the following exception: 'String index out of range. (-1) Must be >=0 and <=42' The method is as follows: void __fastcall TPasswordChangeForm::BuildHelpMessage() { String HelpMsg = ""; if( NewPassEdit->Text.Length() < MinPasswordLength ) { HelpMsg += "Password length too short."; } else { HelpMsg += "Password length OK."; }

问题 I wanna know how to write the following codes in C++ Builder by using With Do Begin statement similar to Delphi. I tried with ComboBox->Text .... do ... try and it's not working. I tried with just do ComboBox->Text .... try , also not working. if (ComboBox->Text.operator==(String("C++ Builder XE7"))) { try { // do something if ((Form1->Memo1->Lines->Text).Pos("<") !=0) { // do something } } catch(Exception &ex) { ShowMessage(ex.ToString()); } if (ComboBox->Text.operator==(String("C++ Builder