Download Programming with Managed Extensions for Microsoft Visual C++ by Richard Grimes PDF

By Richard Grimes

Visible C++ has numerous services that visible C# doesn't have, together with greater entry to unmanaged code, the facility to combine controlled and unmanaged code within the similar resource dossier, direct entry to unmanaged info, and different positive factors. simply because builders who use C# should want to enforce extra C++ of their Microsoft .NET purposes, this ebook completely covers the visible C++ controlled extensions, plus how one can write .NET libraries and functions. Readers study the various programming principles for controlled extensions, in addition to the good points which are new to visible C++ and different .NET-compatible languages.

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40 41 The String class holds data as Unicode characters. Each one is a Char data type. You can access each character through the Chars indexed property, as shown here: String* str = S"Hello"; // Get the fourth character. Char c = str->Chars[3]; The String class implements the Chars property so that the first character in the string is at index zero. Also notice the syntax for declaring a literal string. The S prefix indicates that the string is a managed string. The String class has constructors that take an unmanaged pointer to a char buffer (String(SByte*)) and an unmanaged pointer to a wide char buffer (String(Char*)), which will convert the strings to the managed string.

It looks like you are calling a constructor and naming one of the parameters. In fact, the information that you give in a custom attribute is stored in metadata as a list of instructions. So in effect, this attribute says: â create for me an instance of ObjectPoolingAttribute by calling the constructor that takes a Boolean and pass true for this parameter, and then give the CreationTimeout property a value of 10000â . Iâ ll come back to this issue in a moment. If you want to apply multiple attributes to an item, you can either use a pair of square brackets for each attribute or use one pair of square brackets and give the attributes in a comma-separated list.

C++ does not allow you to cast between an Array* and a multidimensional array in square bracket syntax, so you cannot allocate using CreateInstance and then have the convenience of accessing the elements with the square bracket syntax. The memory for a multidimensional managed array is allocated as a contiguous block of memory, and you can take advantage of this layout with interior pointers. For example, I can allocate an array of integers like this: // Create a multidimensional array. int i __gc[,] = new int __gc[5,5]; for (int j=0; j<=i->GetUpperBound(0); j++) {    for (int k=0; k<=i->GetUpperBound(1); k++)    {       // Initialize the elements.

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