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The only change is to compile with the /clr or /clr:pure option enabled. That is a big difference, because it means that the object file contains managed code, not native code. The linker is able to link the managed code with a native import library without any problem. What this means to you is that you can call a function in a native DLL from managed code simply by including the header file and invoking the function as usual. This works just as well in both mixed and pure modes. In the Visual Studio IDE, you would have to make a few changes in the project properties to recompile your code that uses Win32 with the CLR option. You already know (because we discussed it in 3) about the Common Language Runtime property. What might not be obvious is that to refer to a library like user32.lib you might need to change the Linker property for Additional Dependencies. If you created a CLR project, it is set to $(NOINHERIT). You ll have to remove that to enable CLR projects to link with Win32 DLLs. The drawback to this method is context switching from native to managed code and vice versa. Although it may be easy to invoke the MessageBox method from managed code, a context switch takes place at each transition point and that is every time a native function is called from managed code. As long as you can live with this performance penalty, this interop method is useful. It s also the recommended method when you don t have access to the source code for your native functions. If you do have source to your native DLL, recompiling it as managed code might be better and might help avoid expensive context switches between managed and native code. Incidentally, if you try /clr:safe, good luck wading through the thousands of lines of compiler errors as the C++/CLI compiler tries to interpret the Windows headers in safe mode. Here s a small excerpt of the output: C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(151) : e rror C4959: cannot define unmanaged struct 'tagIMECHARPOSITION' in /clr:safe bec ause accessing its members yields unverifiable code C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(157) : e rror C4956: 'tagIMECHARPOSITION *' : this type is not verifiable C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(157) : e rror C4956: 'tagIMECHARPOSITION *' : this type is not verifiable C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(157) : e rror C4956: 'tagIMECHARPOSITION *' : this type is not verifiable C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(159) : e rror C4956: 'BOOL (__stdcall *)(HIMC,LPARAM)' : this type is not verifiable C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(315) : e rror C4956: 'int (__stdcall *)(LPCSTR,DWORD,LPCSTR,LPVOID)' : this type is not v erifiable C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\imm.h(316) : e rror C4956: 'int (__stdcall *)(LPCWSTR,DWORD,LPCWSTR,LPVOID)' : this type is not verifiable Because pointers and unmanaged structs are not allowed in safe mode, you can t use the Windows headers. But we haven t done any real interop yet, we ve just done the first step. In any interop scenario, you re going to have managed types in the picture, so let s expand the simple call to MessageBox with some managed code. Listing 12-11 shows a case where you are writing a managed class that calls some Win32 functions in its implementation.
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The find command manually searches through all the files on the hard disk. It s not a particularly fast way of finding a file, but it is reliable. Here s an example:
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verify(mockUserAccountDao); assertTrue(actualAccount == account); The usage of mock class generation demonstrated here is not exclusively applicable to testing the service layer. You can use a generated mock class anywhere that you need a mock class to stand in as the container of data that would otherwise be passed to, or obtained from, other components. The checks to determine ordering of method calls can be disabled
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The first line in the upper portion shows us a summary of how many processes are running and in what states. The lower portion s columns contain information that you re mostly familiar with: PID, COMMAND, %CPU, TIME, and #TH (number of threads). Items you might not recognize include the following: #PRTS: The number of Mach ports (secure pipes used for interprocess communication) in use by this process. #MREGS: The number of memory regions in use by this process. RPRVT: The amount of resident private memory in use by the process. RSHRD: The amount of resident shared memory in use by this process. The top command has many flags and options available for controlling what information is displayed and how it appears in the window. Of particular interest is the ability to change what information top is using to sort its output. To sort on a column, press o and then enter the keyword for the information you re interested in. Most users will sort one of the following: cpu: Sort on what percentage of your CPU power the process is using. pid: Sort on process ID. vsize: Sort on how much virtual memory (swap) the process is using. time: Sort on how much CPU time the process is using. uid: Sort on the user ID associated with the process. username: Sort on the user name associated with the process.
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switching (see Figure 12-4). If that isn t the case, make sure your other themes are installed properly. Also remember that users must be logged in to switch themes.
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