Applications Interface Programming Using Multiple Languages: by Ying Bai

By Ying Bai

This ebook addresses the necessity for interfaces, or bridges, among the a number of well known programming languages. With the improvement of the complicated machine controls and purposes, the only programming language occasionally has a quandary for brand new advanced tasks. Programmers will usually be operating with a number of programming languages at a time and, at present, should not have a "bridge" language to tie issues jointly. They spend numerous paintings hours both changing code or operating concurrently on 2 (or extra) assorted languages without delay. to resolve this challenge and to make use of the benefits of a number of languages, an interface is required to set a bridge among different languages. The programming languages lined during this ebook contain: C/C++ and visible C++ 6.0, visible uncomplicated 6.0, Java 1.2 and 1.3, Perl, LabView, LabWindows/CVI and size Studio, Matlab, Matlab C/C++ Math library, Matlab compiler and Matlab image library, and SmallTalk. sensible and hands-on programming examples are supplied with every one undertaking within the ebook. All application examples, that are kept within the hooked up CD-ROM, were demonstrated, debugged and utilized within the real initiatives. Readers can simply opt for the examples to fit their exact wishes.

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Additional resources for Applications Interface Programming Using Multiple Languages: A Windows Programmer's Guide

Example text

Figure 2-22. No, nothing is wrong, because Microsoft Access is not running on your computer now. To see if your program is working correctly, open Microsoft Access and then minimize it. Return to Visual Basic and rerun your project. This time the message box should not show up, and 1052 should be displayed on the upper-left corner of the Form after you click the Test button, as shown in Figure 2-23. Figure 2-23. The number 1052 is the handle's ID number returned by calling the API DLL function FindWindow().

If (dwBytesTransferred == 1) { if (Byte == 0x0D ||Byte == 0x0A) // null char or LF { CommPorts->piNumRcvd = nTotRead; fDone = TRUE; break; } CommPorts->pcBuffer[nTotRead] = Byte; nTotRead++; if (nTotRead == CommPorts->iMaxChars) { fDone = TRUE; break; } } else { if (Byte == 0x0D ||Byte == 0x0A) // null char { msg("Received null character "); fDone = TRUE; break; } } } }while (dwBytesTransferred == 1); //while (nTotRead < pRecv->iMaxChars); } } // while return; } Besides the DLL functions, there are 4 additional local functions implemented in this project.

First, we need to get the application's handle by calling the FindWindow() API function. Next, we call the PostMessage() API function to send a WM_CLOSE message to the application and try to close it. After that, a WaitForSingleObject() function is used to wait until the application handle is returned to indicate that the application has been closed. In order to confirm that the application is closed and the handle no longer exists, the FindWindow() function is called again. The IsWindow() function is used to check if the handle has disappeared.

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