winforms data matrix

winforms data matrix

winforms data matrix

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4. Reboot the machine. 5. Restart the Visual Studio Command Prompt and navigate back to the Performance Tools folder (you can avoid this step by adding the location to your path environment variable see Windows help for how to do this). 6. Run the following: vsinstr C:\PerformanceInstrumentationExample.exe This instruments the binary and renames the original file to PerformanceInstrumentationExample.exe.orig and creates a symbol file called PerformanceInstrumentationExample.exe.pdb. 7. Run the following (use /sample instead of /trace for a sampled performance test) which starts the profiling: vsperfmon /trace /output:c:\PerformanceInstrumentationResults.vsp 8. Launch the application and once the message is displayed press any key to end the PerformanceInstrumentationExample application. 9. Start a new Visual Studio Command Prompt and navigate to the Performance Tools folder. (This is necessary because the first command prompt contains the running VSPerfmon application and nothing else can be entered in that window.) 10. Run the following: vsperfcmd shutdown 11. Run the following: vsperfreport C:\PerformanceInstrumentationResults.vsp /packsymbols This compiles the report with whatever options you choose. Packsymbols stores the symbols so the report can be viewed on another machine. 12. Run the following: vsperfclrenv /globaloff This removes the ability to load profile information and can be a performance issue if not done. 13. Reboot the machine. The test report can now be viewed in Visual Studio.

[DllImport("User32.dll", CharSet=CharSet::Auto, CallingConvention=CallingConvention::StdCall)] extern "C" int MessageBox(int hWnd, String^ text, String^ caption, unsigned int type);

If you are running multiple performance tests (i.e., one after another), then do not re-run the Tip vsperfclrenv /globaloff command until after you are done with all of the tests. However, Microsoft notes that not running this once you are done profiling an application can have an adverse effect on the application.

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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; } One nice thing about P/Invoke is that you don t have to go into the project s properties and change settings. Instead, all the information needed to compile and link is included in the source code. Therefore, you can simply compile the previous code and when you execute it you get the same result as shown in Figure 23-3.

- (void)setSelected:(BOOL)selected animated:(BOOL)animated { [super setSelected:selected animated:animated]; if ([delegate respondsToSelector:@selector(videoCellStartedPlaying:)]) { [delegate videoCellStartedPlaying:self]; } // Configure the view for the selected state [mpc play]; }

Figure 23-3. SimplePInvoke.exe in action It looks the same as Figure 23-2, doesn t it Okay, let s look at the code. Since the code within the main() function is identical to that of Listing 23-1, let s skip that for now (but I will come back to it a little later). The first thing of interest is the use of the System::Runtime::InteropServices namespace. This namespace contains numerous classes, interfaces, structures, and enumerations used to support platform invoke services and COM Interop (which I ll cover later in the chapter). Although many of these members have been made obsolete for one reason or another, still well over 100 exist way too many to cover in this chapter. Fortunately (for me anyway), nearly all of these members are for special situations and thus out of the scope of this chapter. In the previous example, I only need to use three of the namespace members: the DllImportAttribute class, and the CharSet and CallingConvention enumerations. For many of your P/Invoked functions, these will be all you need. In fact, normally you don t have to include CallingConvention enumeration as StdCall is the default. If you are not using String objects, you don t need to use CharSet enumeration, either. So what this boils down to is that you frequently will only use DllImportAttribute.

This is the basic process for using the command-line tools to instrument and run performance tests on production applications. This process is essentially the same for ASP .NET applications and for Windows Services applications although there are some differences. These differences are described in the following sections.

If you feel like saving your fingertips, you can use DllImport instead of DllImportAttribute as they are the same. By the way, you can do this for all attribute classes.

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