By PhD Steven Roman
ISBN-10: 0596150059
ISBN-13: 9780596150051
ISBN-10: 1565926315
ISBN-13: 9781565926318
The Win32 API, or program Programming Interface, is of giant use in extending the ability of visible uncomplicated. The Win32 API is the gathering of capabilities and subroutines that offers programmatic entry to the good points of the working method. It permits visible easy programmers some distance better entry to the interior workings of the home windows working method with no need to undergo during the steep studying curve linked to visible C++ variety home windows programming. The e-book is designed for clients with an intermediate-level (or larger) wisdom of visible simple model four or later and a wish to stretch VB into the world of home windows approach programming. clients shouldn't have any heritage in visible C++, nor do they want any past event programming the Win32 API. This booklet teaches clients easy methods to do particularly easy initiatives, equivalent to including tab stops to a listing field and accumulating process info (i.e., which model of home windows is working on a process and the variety of buttons at the user's mouse). It additionally teaches clients approximately numerous complex programming ideas resembling synchronizing VB functions to allow them to paintings in cooperation with one another and the way to extract info from controls that belong to a different software. Win32 API Programming with visible easy additionally spends a great deal of time describing the elemental operations of the home windows NT and home windows 95/98 working structures. Microsoft's documentation seldom takes under consideration what the reader understands or doesn't recognize. for that reason, an excellent grounding within the fundamentals of the home windows working platforms can help VB programmers to raised comprehend Microsoft's documentation. This publication is helping VB programmers get rid of the trial and blunder procedure that's frequently linked to calling the Win32 API from visible easy and does so in a pragmatic, basic style that's the hallmark of writer Steve Roman's kind.
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Extra resources for WIN32 API Programming with Visual Basic
Sample text
The difficulty comes when they use different interpretations. VB uses the signed integer interpretation, and Win32 (we are assuming) uses the unsigned short integer interpretation. Thus, referring to Figure 5-1, in passing a number un(w) to an API function, we need to tell VB to pass the number si(w), since Win32 will interpret the binary word w that is actually passed (on the stack) as un(w). Conversely, in receiving a number, VB will see it as si(w), and we need to make the translation to si(w) which, by the way, will require using a larger VB data type to hold the value.
To be more specific, it appears in the SendMessage API function declaration: LRESULT SendMessage( HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam ); 48 // handle of destination window // message to send // first message parameter // second message parameter 49 Thus, for instance, the VC++ variable declaration: LPARAM avar; tells us that avar is intended to hold a 32-bit message parameter, for use in SendMessage. The alternative is: unsigned long avar; which tells us nothing about the intended use of avar.
For instance, the integer and long VB data types are fundamental. A derived data type is one that is constructed from fundamental data types. ) Visual Basic Data Types The Visual Basic data types are listed in Table 4-1. Table 4-1. ) Table 4-1. VB Data Types (continued) Type Size in Bytes Range of Values Date 8 1/1/100 to 12/31/9999 Object 4 String (BSTR) See Chapter 6. Fixed-length string 2 bytes for each character Variant 16 Array User-defined type (or structure) Let us make a few comments about these data types: The Boolean data type is a special 16-bit data type with underlying set {True, False}.
WIN32 API Programming with Visual Basic by PhD Steven Roman
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