Debugging Visual C++ Windows by Keith Bugg
By Keith Bugg
Comprehend and regulate the computer virus cycle! This specific computer reference, offers educational dependent examples on tips to debug home windows purposes built with visible C++. you'll get a conceptual version for combating and putting off insects throughout the layout cycle that incorporates feedback on identity, prevention and correction for every of the 4 sorts of insects: * collect time insects * run time error * common sense and layout error * computer blunders Debugging visible C++ home windows examines a number of the elements that obliquely have an effect on debugging. It incorporates a assessment of strong venture making plans and administration techniques, trying out plans, and identified compiler insects. you are going to find out how compiler instruments similar to hint, undercover agent, and pressure paintings. and you'll notice tips on how to display screen reminiscence operations on your application because it executes - whereas viewing the consequences 'real time' on your debug window! additionally integrated is a severe evaluation of the debugging instruments that send with visible C++, in addition to, advertisement debuggers comparable to BoundsChecker and CodeWizard. pointers on debugging database purposes also are supplied (appendices are supplied on ODBC mistakes codes and SQL kingdom values). The better half disk comprises workspace/projects demonstrating reminiscence country checking, blunders message retrieval, compiler insects, and the way to exploit the #pragma compiler directive, ASSERT and hint.
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New allocates fixed-size memory blocks on the heap (or free store), as in this example. char * myString = new char; Here, 128 bytes have been reserved for the variable myString. If you need resizable memory blocks, you must use the C run-time functions malloc(), realloc(), and free() to manage the heap. Don't try to use realloc() on memory that has been allocated with new. Likewise, don't use free() on memory allocated with new, or use delete with memory allocated via malloc(). Or, more simply, don't mix the C calls with the C++ ones you will corrupt memory, and this will lead to bugs.
An attempt is made to allocate memory already allocated. An attempt is made to free memory already freed or never allocated. In the old days, Windows gave you 16 chunks of memory, each one 64Kb in size. These were accessed through a segment (4 bits) and an offset (16 bits) for an apparent 20-bit address space. With the 32-bit version, each process gets its own 32-bit address space of virtual memory. With 232 memory < previous page page_17 next page > < previous page page_18 next page > Page 18 locations, that works out to about 4Gb, which is highly impractical for even midrange and mainframe computers, let alone the humble PC.
The assertion is ASSERT(m_hObject == NULL); This assertion can be caused by not selecting drawing objects (pens, brushes, and so on) out of the device context that have been selected in to it [as with SelectObject(), and so forth]. CPP. Class CString is notorious for being finicky. One cause of this assertion can be using GetWindowText(CString&) for a window that has no title. If the window is a combo box (remember, all controls are child windows derived from CWnd), GetWindowTextLength() returns 1 for "Drop List" combo boxes.