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If you are a seasoned traditional C++ programmer, you probably saw immediately a problem with the handle s ability to change addresses. There is no fixed pointer address to access the object in memory. In prior versions of C++/CLI (Managed Extensions for C++), the same syntax was used for addressing managed and unmanaged data. Not only did this lead to confusion, but it also did not make it apparent that the pointer was managed and thus could change. With the new handle syntax, it is far less confusing and readily apparent that the object is managed. Unfortunately, the volatility of the handle address also leads to the problem that passing a handle to a managed object, as a parameter to an unmanaged function call, will fail. To solve this problem, C++/CLI has added the pin_ptr<> keyword, which stops the CLR from changing its location during the compacting phase of garbage collection. The pointer remains pinned so long as the pinned pointer stays in scope or until the pointer is assigned the value of nullptr.

In addition to the warnings that are generated simply by turning on the /analyze compiler option, you can achieve further testing with PREfast by annotating your code with specific attributes. For example, you can annotate a function call with an attribute that tells PREfast that the return value of this function must be checked. Then when that function is used, PREfast will report a warning whenever that function is used without checking the return value. To enable the use of the attributes from C code, simply include the following include directive: #include <CodeAnalysis/SourceAnnotations.h> When compiling C++ code, add the preceding include directive, but also add the following using namespace statement: using namespace vc_attributes; To annotate your code, you add PREfast attributes to parameters and return values. Attributes appear in square brackets and have various properties you can set to signal PREfast to perform a check. You use two attributes with PREfast: The Pre attribute is used with function parameters only and is designed to tell PREfast to check for various conditions whenever parameters are passed to the function whose parameter is attributed. The Post attribute is used on the function s return values and on out parameters, such as pointers that are intended to be set or filled in during the function call. For example, you might use the Pre attribute to enforce that a pointer parameter is a valid non-null pointer. If this attribute is set, then PREfast will check any pointers used when calling this function to ensure that they can be verified to be valid, as demonstrated by the code in Listing 13-5. Listing 13-5. Using the Pre Attribute #include <CodeAnalysis\SourceAnnotations.h> using namespace vc_attributes; void f ([Pre(NullTerminated=Yes)] char* str);

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Figure 10 9. Choosing an IIS virtual directory At this point, click Next, and you ll be presented with the summary of options shown in Figure 10 10.

The pin_ptr<> uses template syntax where you place the type of object you want to pin within the angle [<>] brackets. For example: pin_ptr<int> I covered templates in 4.

int main ( ) { char x[100]; f(x); // error C6054 - x is not null-terminated } Listing 13-6 shows an example of using the Post attribute to specify conditions on how the function handles the return value. The attribute contains a tag that specifies that this attribute applies to the return value, not the function as a whole. Listing 13-6. Using the Post Attribute // checkreturn.cpp #include <stdio.h> #include <codeanalysis\sourceannotations.h> using namespace vc_attributes; [returnvalue:Post(MustCheck=Yes)] int f() { FILE* fp; fopen_s(&fp, "file1.txt", "rw+"); if (fp == NULL) return -1; fprintf_s(fp, "add some text"); fclose(fp); return 0; } int main() { f(); // triggers an error, C6031 since the return value is not checked } In this case, the output is as follows: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. checkreturn.cpp c:\PREfast_code\checkreturn.cpp(19) : warning C6031: Return value ignored: 'f' Microsoft (R) Incremental Linker Version 8.00.50727.42 Copyright (C) Microsoft Corporation. All rights reserved. /out:checkreturn.exe checkreturn.obj

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