winforms qr code

winforms qr code

winforms qr code

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Okay, let s take a closer look at the main method of the previous example with and without P/Invoke: int main(array<System::String ^> ^args) { long Squareof4 = square(4); Console::WriteLine(L"The square of 4 is {0}", Squareof4); MessageBox(0, L"Hello World!", L"A Message Box", 0); return 0; } The code for calling the square method was fairly easy because it only deals with the primitive data type long. On the other hand, I had to be careful when it came to coding the call to the MessageBox() function especially for the non-P/Invoke example because the second and third parameters are pointers to null-terminated wchar_t arrays, which an L string happens to be. If you use the more common System::String type in the non-P/Invoked version, you get an ugly compile-time error due to data type incompatibility. To get it to work, you have to pin the string s handle first before calling the function. Here are a couple of ways of doing that: String^ s = L"Hello World"; String^ t = L"A Message Box"; pin_ptr<const wchar_t>ss = &(s->ToCharArray()[0]); pin_ptr<const wchar_t>tt = PtrToStringChars(t); // covered in chapter 24 MessageBox(0, ss, tt, 0); In a nutshell, you have to do your own data marshaling.

Another way of saying this in the test-driven development terminology is red/green/refactor Red is the test fail stage, green is the test pass stage, and refactoring is altering the code to make it more efficient While VSTS does not, per se, support this specific process, since it is a process and not a technology, you can use VSTS to support the test-driven development methodology The problem with test-driven development is that it still relies on developers to plan the unit tests, write them, and execute them While tools like JUnit, NUnit, and VSTS make this process a lot easier, it is still a process that needs to be followed by all Most developers (and we are speaking from experience here) cannot stand to do testing.

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Typically when using P/Invoke with C++/CLI you don t have to worry about marshaling since in most cases the managed and unmanaged formats of the data types are the same. There are exceptions to this; the most common are the String type and classes. Consequently, in most situations there is no need to do anything special when passing and returning simple data types to and from unmanaged DLLs. That being said, there is nothing stopping you from explicitly defining how parameters are to be marshaled. To do this, you use the attribute System::Runtime::InteropServices::MarshalAsAttribute. The MarshalAsAttribute is a rather easy attribute to work with; it takes one positional enumeration parameter of type System::Runtime::InteropServices::UnmanagedType and is coded like this:

- (void)dealloc { self.urlPaths = nil; self.externalWindow = nil; self.selectedCell = nil; [super dealloc]; }

VSTS helps eliminate that problem by providing policies, which you can enable to say that unit tests must have been performed before code can be checked in (refer to 3) Then there is the problem of how to come up with a comprehensive set of criteria on which the individual unit tests should be based The list of tests must be developed by the developer in conjunction with a functional or business analyst The analyst alone will not supply you with all of the possible combinations of issues that could arise, simply because analysts do not think like developers Likewise, a developer cannot necessarily come up with all of the valid tests because some of those tests may be predicated on business situations In the list of unit tests shown earlier for the sample AgeCheck method, an analyst might supply you with the first three items in the list.

[DllImportAttribute("NativeCode.dll")] extern "C" long square([MarshalAs(UnmanagedType::I4)] long value); The CLR in this example really doesn t need the MarshalAs attribute to help it marshal the value parameter during the P/Invoke process because long and UnmanagedType::I4 are binary equivalents. Some of the more common enumeration values available are shown in Table 23-1.

String bool String Decimal Delegate char short int or long __int64 String or StringBuilder String or StringBuilder String or StringBuilder float double String unsigned char unsigned short unsigned int or unsigned long unsigned __int64

All of the other tests in the list are generally language-specific tests and input validation tests, so they are not tests that a business user would consider You can find a lot more information about test-driven development on the Web An excellent book on unit testing is Test Driven Development: By Example by Kent Beck (Addison-Wesley, 2002)..

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