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StringWriter and StringReader provide support for writing and reading strings using the same interfaces used for writing to streams and files. The use of this class is straightforward, as demonstrated in Listing 5-15, which uses some of my wife s poetry, this one inspired by Seattle s Pike Place market. Listing 5-15. Writing Poetry with StringWriter // stringwriter.cpp // The Windows Forms namespace lives in a different // assembly, which is not referenced by default as // mscorlib.dll is, so we must use #using here. #using "System.Windows.Forms.dll" using using using using namespace namespace namespace namespace System; System::IO; System::Text; System::Windows::Forms;
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int main() { StringWriter^ sw = gcnew StringWriter(); sw->WriteLine("Pike Place"); sw->WriteLine("Street of Dreams"); sw->WriteLine("(C) 2006 Jeni Hogenson"); sw->WriteLine(); sw->Write("Walking with bare feet\n"); sw->Write("Seattle streets, gospel beat,\n"); sw->Write("She's got magic\n"); sw->WriteLine(); sw->WriteLine("Bag of black upon her back\n" + "A sensual blend, soul food that is;\n" + "Local color."); sw->WriteLine(); String^ jambo = "jambo"; String^ s = String::Format("Open the bag, {0}, {1}.", jambo, jambo); sw->WriteLine(s); sw->Write("Make a wish, {0}, {0}.", jambo); sw->WriteLine();
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CHAPTER 5 FUNDAMEN TA L TYPES: STRING S, A RRAY S, A ND ENUM S
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s = "Feel it, grab it, grope it.\n"; String::Concat(s, "Follow every curve.\n"); String::Concat(s, "Can you wait to find it \n"); String::Concat(s, "Do you have the nerve "); sw->WriteLine(s); sw->WriteLine("A drop of oil, jambo, jambo."); sw->WriteLine("Whisper in her ear,"); sw->WriteLine("Ask the question in your heart"); sw->WriteLine("that only you can hear"); sw->WriteLine(); StringBuilder^ sb = gcnew StringBuilder(); sb->Append("Fingers now upon your ears,\n"); sb->Append("Waiting for the space\n"); sb->Append("An answer if you're ready now\n"); sb->Append("From the marketplace\n"); sw->WriteLine(sb); sw->WriteLine("The call of a bird, jambo, jambo."); sw->WriteLine("The scent of a market flower,"); sw->WriteLine("Open wide to all of it and"); sw->WriteLine("Welcome back your power"); sw->WriteLine(); sw->WriteLine("Jambo this and jambo that,"); sw->WriteLine("Walking with bare feet."); sw->WriteLine("No parking allowed when down under,"); sw->WriteLine("Keep it to the street."); sw->WriteLine(); sw->WriteLine("Dead people rising,"); sw->WriteLine("Walking with bare feet,"); sw->WriteLine("No parking allowed when down under,"); sw->WriteLine("Keep it to the street."); // The resulting string might be displayed to the user in a GUI. MessageBox::Show(sw->ToString(), "Poetry", MessageBoxButtons::OK); }
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System::String and Other I/O Systems
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Still prefer the trusty C runtime function printf Unless you re compiling with safe mode (the /clr:safe compiler option), you can still use the C Runtime (CRT) Library or the iostream library if that s what you prefer, although the resulting code will not be verifiably safe from memory corruption problems. Most CRT functions taking a variable argument list will work with System::String, as in Listing 5-16. Note that as of Visual C++ 2005, and continuing with
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C HA PTER 5 FUNDA MENTAL TYPES : STRINGS , ARRA YS , AN D E NUMS
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Visual C++ 2008, it is recommended that you use the more secure variants of the standard CRT functions. While these are not yet part of the ANSI standard, they have been proposed as extensions to the standard. Listing 5-16. Using printf // cli_printf.cpp using namespace System; #include <stdio.h> int main() { String^ str = "managed string"; // The string is automatically converted to a // char array for printf_s. printf_s("%s", str ); } The output of Listing 5-16 is shown here:
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managed string
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The conversion for printf_s (and printf) is due to the String class s ability to be converted via a variable argument list and not a general conversion to const char *. For example, the following line: printf_s(str); produces an error: cli_printf.cpp(12) : error C2664: 'printf_s' : cannot convert parameter 1 from ' System::String ^' to 'const char *' No user-defined-conversion operator available, or Cannot convert a managed type to an unmanaged type Using cout with System::String is a bit more complicated. The string must be marshaled as a native data type that the overloaded shift operator (<<) supports, and because we are getting a native pointer to managed data (which could be moved by the garbage collector), it must be artificially fixed in memory during the time that the native data type is active. We accomplish this by declaring a pinning pointer (pin_ptr), as shown in Listing 5-17. The first step is to use PtrToStringChars (defined in vcclr.h) to get a pointer into the underlying wide character array that represents the string, and assign that to a pinning pointer that fixes the data it points to as long as the pinning pointer is in scope. This pinning pointer must in turn be converted to a type that the shift operator supports, so we use static_cast to convert it to const wchar_t* and pass that to the expression involving wcout, the wide character version of cout.
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