三军大学: 中国历代战争史 18.pdf
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1、g when entering/leaving cells. In fact, several bugs are known by Sheridan, yet they insist that the workarounds (timely refreshes) will cover up the bugs. For the most part its true, but not without great effort and debugging. For very simple applications, the controls seem to work adequately. Usin
2、g bound drop-down combo boxes (with automatic list searching by typing the starting letters of the list element) can be implemented as separate controls or within a grid with relative ease.Q+E Multi Link by Intersolv - Q+E Multi-Link are marketed to serve the needs of those developers who wish to si
3、mplify data access to a number of popular databases. This product consists of several custom controls with built-in QBE for storing queries. Database access uses Intersolv drivers (versus ODBC) which are generally more efficient than the native ODBC drivers. Other custom controls simplify the proces
4、s of navigating through result sets, retrieving/writing to record sets, and displaying data. There have been documented problems in this product with accessing Sybase System 10 databases.VSVBX by VideoSoft - VSVBX is a very powerful, yet relatively inexpensive product. This VBX is highly recommended
5、 for its ability to resize forms/controls at run-time using what VideoSoft calls Elastics. These elastics are similar to 3-D frames for grouping of related controls on a form, however an elastic can readily be configured to proportionally resize the controls on a form whenever the user resizes the w
6、indow. Elastics can be used to position itself and its controls along any of the edges of a window (i.e. a constant -sized status bar at the base of the window). VSVBX also provides VB with a tab system that works quite well.SpreadVBXFormula OneTechnical ArchitectureFile Versions - Before beginning
7、development, identify all the essential .DLLs, .DRVs, and .VBXs that will be used on the project. After identifying these files, make sure that you have the correct version (not always the most recent) of the files. File Locations - Once identified, these files should then be centrally located on th
8、e server (or floppy disk if no server is available). Any updates should be added to development documentation and to the central storage location so that all developers can update their PCs. This might seem like a big hassle at first, but it will pay off in the long run (especially when you go to cr
9、eate the executable and setup the client workstations). Memory Allocation Tools - A tool that will help you define which files are loaded into memory by your application is Microsoft Windows Process Status (WPS.EXE). This executable ships with VB and is stored in the VBCDK directory. When using WPS
10、to identify files used by your VB application, close all applications (including Clock or Norton Anti-Virus), start WPS, and select the File/Save Dump option in order to output this information to a text file. The compiled VB application should then be started, and the new WPS information (click Upd
11、ate to be sure that the list has been refreshed) should be saved to a text file. Comparing the two lists will then show the additional files loaded by the VB application, and therefore are required on the distribution disk.Extraneous Files - All extra .VBX and .DLL files that will not be used by you
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