Create and initialize a BSTR string by using a CComBSTR object. Using namespace System::Runtime::InteropServices Create a _bstr_t string, display the result, and indicate the use this string to create other types of strings. Create a string of wide characters, display it, and then Create and display a C-style string, and then use it compile with: /clr /Zc:twoPhase- /link comsuppw.lib Single byte and multibyte character ( MBCS) functions can operate on char * strings.įor information about running and debugging this example, see Run the examples. In the examples below, char * strings are sometimes referred to as multibyte character strings because of the string data that results from converting from wide Unicode strings. C-style strings usually require 1 byte per character, but can also use 2 bytes. A char * string (also known as a C-style string) uses a terminating null to indicate the end of the string. This example demonstrates how to convert from a char * to the string types listed above. Turn on /ASSEMBLYDEBUG: Project properties > Linker > Debugging > Debuggable Assembly > Yes (ASSEMBLYDEBUG).Set the debugger type to mixed: Project Properties > Debugging > Debugger Type > Mixed (.NET framework).Turn off /JMC (Just My Code debugging): Project Properties > C/C++ > General > Support Just My Code Debugging > No.Exchange /Zi (Debug information format) for /Z7: Project Properties > C/C++ > General > Debug Information Format > C7 compatible.Turn off /EHs (Exception handling model): Project Properties > C/C++ > Code Generation > Enable C++ Exceptions > No. Turn off /RTC1 (Set Basic Runtime Checks to Default): Project Properties > C/C++ > Code Generation > Basic Runtime Checks > Default.The following links provide instructions for where in the IDE you can turn off the conflicting switches: The /clr switch conflicts with some compiler switches that are set when you create a C++ Windows Console App project. Add the /clr and /Zc:twoPhase- command line arguments to Project Properties > C++ > Command Line > Additional Options.If you create a new C++ Windows Console app to run the examples, make the following project changes: However, you'll need to add #include "pch.h" to the top of each example.Įither way, add comsuppw.lib to Project Properties > Linker > Input > Additional Dependencies. If you create a CLR Console App, you don't have to make the following changes to the compiler and debugger settings. Or, if you've installed C++/CLI support, you can create a CLR Console App (.NET Framework). To run the examples in Visual Studio 2022, you can create a new C++ Windows Console App. Any changes made to the new string won't affect the original string, and vice versa.įor more background information about converting narrow and wide strings, see Converting between narrow strings and wide strings. In all cases, a copy of the string is made when converted to the new type. The strings types that are covered include char *, wchar_t*, _bstr_t, CComBSTR, CString, basic_string, and System.String. For more information on each of the grey boxes, see the help page.This article shows how to convert various Visual C++ string types into other strings. You can use checkboxes alongside many boxes to tweak the results. You will then see the conversion results in the grey boxes. You should also ensure that the checkbox next to Convert \n etc is selected, in order to convert the \n and \t escapes.Īfter selecting those options, click on the Convert button. Note, however, that this (unusually convoluted) text represents two characters using just a code point number – therefore, for this particular example, you should select Treat bare numbers as Hex code points (or decimal) to convert those numbers as well as the other escapes. Normally you would simply click on the Convert button just above the field to show the various escape formats below. The text in the field with a green background currently contains a variety of escapes. selects all the text in a box (useful for deleting), and copies the text to the clipboard, if your browser supports that. You can then cut & paste the results into your document. You can also do the same in any grey box, if you want to target only certain types of escaped text. Alternative representations will appear in all the other boxes. Type or paste text in the green box and click on the Convert button above it.
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