COM Wu. Pi. N G Xi. N Blo. GVISSIM has a licensed feature VISSIM COM that a user can use to do automation style programming. It provides convenient, easy to use  interfaces to access VISSIM functionality programmingly e. Excel client. VISSIM COM Server by design can only be invoked in single instance mode. That is, if you have a COM client that tries to establish a connection with a VISSIM COM server, the connection will be established only to the first VISSIM instance that has already been created. In other words, a new VISSIM instance is created if and only if there is currently no active VISSIM instance running. On the other hand, if there are multiple VISSIM instances, your COM client would only connect to the first instance. Yesterday at  the 9. TRB annual meeting, a Minnesota friend asked me if it is possible to create multiple VISSIM COM server connections. That was a pretty interesting question, and the answer lies in a clear understanding of what is under the hood of Microsofts COM technology. Probably  let me do a little lecture first for those non programmers or who not familiar with the inner workings of COM. Since in 9. Bring all the things you love right to your Windows or Mac desktop. Mac MacPaint image mak. AIMSUN NG Network TSSTransport Simulation Systems anim. Compaq SmartStart Scripting Toolkit File as3. Aimsun Users Manual v8. Refer to the Aimsun scripting section for more information. Mac OS X SQLite. Manual zz. Categories. Baby children Computers electronics Entertainment. Complete List of ALL File Extensions and Information. SQLite-Export-CSV-Step-2.png' alt='Aimsun Scripting Manual Programs For Mac' title='Aimsun Scripting Manual Programs For Mac' />VISSIM is only used as a local out of process COM server,  let me just focus on explaining out of process COM only. In process COM has somewhat different mechanism in order not to confuse Ill rather leave it to some discussion later. For out of process COM exe server like VISSIM,  a client program a client program can be written in any COM compliant languages such as VB, VC,. NET, or Delphi starts a connection by calling Windows Operating Systems COM API in the following sequence 1. Co. Create. Instance. Nothing need to mention about this COM API. Co. Get. Class. Object. For In Process COM object, Co. Get. Class. Object will get the pointer to the class factory but for out of process COM exe like VISSIM, Co. One manual describes it as the. ENVIs processing tools to be called from IDL programs. Mac OS X is the current operating system that is. Get. Class. Object will get the VISSIM path from the Prog. ID in the system registry. Note, different versions of VISSIM has different Prog. ID. Also remember VISSIM is registered a Local. Tap Tap Revenge 4 Ipa on this page. Server, so no DCOM is involved. Co. Register. Class. Object. Once the system locates VISSIM. Open Text Fax Document Distribution Open Text HostExplorer Open Text NFS Server Open Text NFS Solo Open Text Secure Shell Adtec Software Latitude Product suite. Sitemap. Home Portfolio About Contact. Free Download Aimsun Scripting Manual Programs Like Microsoft. Heimdall One Click Unbrick Mac. Co. Register. Class. Object this is the ultimate ole. API to be invoked, even VISSIM uses some. NET wrappers will be invoked in the start up code before calling the Win. Main entry function of VISSIM. Here is the signature Co. Register. Class. ObjectCLSID, p. Unk, dw. Cls. Context, flags, dw. Register. The key point is the fourth parameter flags. It determines during run time whether VISSIM COM exe can be started as single instance or multiple instances. Check MSDN for more information about this COM API http msdn. VS. 8. 52. 9. aspx. The fourth parameter is a REGCLS enumeration variable defined as typedef enum tag. REGCLS. REGCLSSINGLEUSE 0. REGCLSMULTIPLEUSE 1. REGCLSMULTISEPARATE 2. REGCLSSUSPENDED 4. REGCLSSURROGATE 8. REGCLS All we need to do is to  specify REGCLSSINGLEUSE,  then VISSIM COM exe will be invoked in a multi instance manner. WhyHere is the description of the REGCLS flag After an application is connected to a class object with Co. Get. Class. Object, the class object is removed from public view so that no other applications can connect to it. This value is commonly used for single document interface SDI applications. Specifying this value does not affect the responsibility of the object application to call Co. Revoke. Class. Object it must always call Co. Revoke. Class. Object when it is finished with an object class. Multiple applications can connect to the class object through calls to Co. Get. Class. Object. If both the REGCLSMULTIPLEUSE and CLSCTXLOCALSERVER are set in a call to Co. Register. Class. Object, the class object is also automatically registered as an in process server, whether or not CLSCTXINPROCSERVER is explicitly set. The above text is a little twisty essentially it says, if REGCLSSINGLEUSE is set, then any client connection request would result in creation of a new class object in our case, the class object is VISSIM object represented by IVissim interface. Creating a new class object means starting a new VISSIM. VISSIM. exe is the host of the class object. Period. A little interesting additional information on what happens after Co. Register. Class. Object Internally, a IO completion port a. IOCP is created.   IO completion port is a fairly low level Inter Process Communication IPC mechanism. By low level, I mean, File handle, Winsock. IPC mechanism would be built on top of IO Completion port. So IOCP is pretty ugly if you ever bother to delve into that level to satisfy your peeking eyes and curiosity. The created IO completion port receives IO completion packets then dispatches the package via Windows messaging then to the Wnd. Proc registered by ole. That Wnd. Proc then unmarshall the out of process COM method invocation and restores the original functions stack frame, hence finishes the entire invocation COM function. This creation of stack frame on the fly is similar to how web services are implemented. All are based on stack frames created during run time. Stack frame is just a memory footprint to prepare a function invocation, say, you need to allocate sufficient memories from the stack, then save all the current states registers and push the parameters. Of course, in COM, the convention is always stdcall. Download Tema Standard Free Pdf. Depending on the threading model the subject COM objects implements single apartment, multiple apartment or whatever, there are some nuisances that I am not going to touch here.