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4 professional authors supply a accomplished examine the ATL Server library designed for development high-end internet functions and net companies. different books on ATL don't pass into intensity at the ATL Server section of the library (web companies and internet applications). different books on ISAPI don't supply perception into the only library designed to make ISAPI improvement a lot more straightforward. this is often the one ebook written via the very those who created the ATL Server library.

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You’ll first examine what it looks like in traditional C++, and then you’ll learn how it’s implemented using the new Visual C++ attributes. You can generate a basic request handler by using the ATL Server Project Wizard. Simply deselect the Generate Attributed Code option under the Developer Support Options tab to disable attributed code generation. For the time being, ignore the ISAPI project and focus strictly on the request handler project itself (application DLL). Your request handler will reside in a DLL.

Line 11: If you’re using POST, then GetFormVars will return a pointer to your data. • Line 16: If you’re using GET, then GetQueryParams will return a pointer to your data. • Line 20: Call Lookup to get the value of an input parameter named fruit. • Line 24: If there’s a value for the fruit parameter, then output its value using m_HttpResponse. Now you’ve seen the first two basic ways of accessing your user’s input. Either method is fine for this simple case, but you may have noticed that some functionality is lacking, for example: • There’s no way to set constraints on the values of your data.

These two sets of methods address the short-comings that we listed in the previous section. The set of Validate methods allows you to determine if a specific input exists, and optionally whether that input fits into certain constraints, such as a minimum or maximum length. You’ll examine this set of methods in detail in this section, and then you’ll look at the Exchange methods in the next section. Consider the example in Listing 6-4. "; 30 break; 31 } 32 case VALIDATION_E_LENGTHMAX: 33 { 34 m_HttpResponse << "Name of the fruit was too long"; 35 break; 36 } 37 case VALIDATION_S_EMPTY: 38 { 39 m_HttpResponse << "No fruit was selected"; 40 break; 41 } 42 case VALIDATION_E_PARAMNOTFOUND: 43 { 44 m_HttpResponse << "input value was not found"; 45 break; 46 } 47 case VALIDATION_E_INVALIDPARAM: 48 { 49 m_HttpResponse << "Invalid selection"; 50 break; 54 Chapter 6: Getting User Input Chapter 6: Getting User Input 51 52 53 54 55 56 57 58 59 60 55 } case VALIDATION_E_FAIL: { m_HttpResponse << "unspecified error"; break; } } return HTTP_SUCCESS; } Let’s look at this example line-by-line: • Lines 1 through 16: This is the same code that you’ve seen in previous examples to get a CHttpRequestParams object independent of whether you’re using POST or GET.

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