Some experience records during summer Development

Jeremy Lin

1. GDI + settings

This is not an experience. It is mainly used in schools. Basically, it has never been used by GDI +. It is only necessary to use it after arriving at the company. Record the configuration process of GDI + for future reference.

(1) Add gdiplus. lib to the Project Properties> linker> Add Dependencies

(2) Add in stdfx. h

#include "gdiplus.h"using namespace Gdiplus;

(3) add two member variables to the xxxapp class

GdiplusStartupInput m_Gdistart;ULONG_PTR m_GdiplusToken;

(4) Add the initinstance () function in xxxapp

GdiplusStartup(&m_GdiplusToken, &m_Gdistart, NULL);

(5) add exitinstance () in xxxapp

GdiplusShutdown(m_GdiplusToken);

Ii. debugging experience

When a new variable is detected with vs2010, it should be deleted after the new variable is not used (not necessarily in the current block;

Today, I encountered a problem: An error occurred after the delete operation. The reason is that the new space is assigned to other variables. Therefore, an error occurs after the delete operation.

3. How to know the memory size to be released for free and delete

When malloc or new is used to allocate memory space, the actually allocated space is larger than the space applied by the programmer. A part of actually allocated memory space is used to save the size, verification, and other information of the allocated memory.

Free and delete

(1) When Delete releases space, it calls the corresponding object's destructor. When new allocates space, it also calls the object's constructor to initialize the object, use malloc to allocate only the memory;

(2) Before calling free, check whether the pointer to be released is null. If delete is used, no check is required;

(3) Free and delete cannot be mixed.

Differences between Delete and delete [] in C ++

(1) Objects of the basic data type do not have destructor. After a new array space is added, delete and delete [] can be used;

(2) However, for data types of class objects, only delete [] can be used;

Ref: http://www.cnblogs.com/charley_yang/archive/2010/12/08/1899982.html

Iv. Introduction to Linux debugging

I was not familiar with Linux before, but now I have to work hard at school.

(1) Python debugging tool winpdb in Linux, some commands

BP breakpoint under an address

BL lists existing breakpoint Information

BC removes the previously set breakpoint from the system

(2) debug python in GDB

GDB Python

Break function name

Run

L display the current Code

N next step

S Follow-up function

Print Output print content

GDB prints the string value

Print stringname. c_str ()

5. remote FTP login to Ubuntu

FTP: // usrname: [email protected]

5.7-9.5 Mt

Address: http://blog.csdn.net/linj_m/article/details/39322911

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Some experience records during summer Development