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21 Determine Your Goals, Results, or Outcomes 35 Quick Start 35 How To 35 Try It 36 22 Determine Requirements for Collecting, Storing, Analyzing, and Maintaining Your Data 36 Quick Start 37 How To 37 Try It 38 23 Design Your Data 38 Quick Start 38 How To 38 Try It 46.

ToString()) You have used ANSI C strings so far, but this is not the only type of string Wide-character strings are becoming widely adopted and use two bytes to represent a single character; and following the C tradition, the string is terminated by a null character Consider a wide-character version of the sayhello function: void CINTEROPDLL_API sayhellow(wchar_t* str, int sz) { static wchar_t* data = L"Hello from C code Wide!"; int len = min(sz, wcslen(data)); wcsncpy(str, data, len); str[len] = 0; } How can you instruct the runtime that the StringBuilder should be marshalled as a widecharacter string rather than an ANSI string The declarative nature of PInvoke helps by providing a custom attribute to annotate function parameters of the prototype and to inform the CLR about the marshalling strategy to be adopted The sayhellow function is declared in F# as follows: [<DllImport("CInteropDLL", CallingConvention=CallingConventionCdecl)>] extern void sayhellow([<MarshalAs(UnmanagedType.

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LPWStr)>]StringBuilder sb, int sz); In this case, the MarshalAs attribute indicates that the string should be marshalled as LPWSTR rather than LPSTR..

Another important data type that often should be passed to native code is a function pointer Function pointers are widely used to implement callbacks and provide a simple form of functional programming; think for instance of a sort function that receives as input the pointer to the comparison function Graphical toolkits have widely used this data type to implement event-driven programming, and they often have to pass a function that will be invoked by another one PInvoke is able to marshal delegates as function pointers, and again the runtime is responsible for generating a suitable function pointer callable from native code When the marshalled function pointer is invoked, a stub is called, and the activation record on the stack is rearranged to be compatible with the calling convention of the runtime Then the delegate function is invoked.

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Although in principle the generated stub is responsible for implementing the calling convention adopted by the native code receiving the function pointer, the CLR supports only the stdcall calling convention for marshalling function pointers Thus, the native code should adopt this calling convention when invoking the pointer; this is a restriction that may cause problems, but in general on the Windows platform the stdcall calling convention is widely used The following C function uses a function pointer to apply a function to an array of integers: typedef int (CALLBACK *TRANSFORM_CALLBACK)(int); void CINTEROPDLL_API transformArray(int* data, int count, TRANSFORM_CALLBACK fn) { int i; for (i = 0; i < count; i++) data[i] = fn(data[i]); } The TRANSFORM_CALLBACK type definition defines the prototype of the function pointer we are interested in here: a function taking an integer as the input argument and returning an integer as a result.

Change the Bind type to Secure and the Server type to AD DS/LDS, and then click OK. Choose Schema->Hide Present Elements. This will hide elements that match between the two directories, but still display only elements that differ. Expand the Classes container. The class attributes will be displayed, as shown in Figure 6-7.

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