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Experience Sharing with GDI [original]

For programming on the Windows series, GDI is a very important technical point. Many programs run abnormally many times, except for the well-known memory leakage, the leakage of GDI resources is also a direct cause. today, I will share some of my experiences in programming with you.1. For the created GDI object, you must use deleteobject to release it. The release sequence is create and then release, and then create.Here, create refers to the GDI function that starts with it, such as createdibit

Screen screenshot and saving Programming

The keyboard has the print screen key. This key is simulated by each program. Save the image to the clipboard. Then the program accesses the clipboard, Save it to a file. You can also directly call winapi to copy the interface to the clipboard. API timing + screenshot! Windows GDI(1) screenshotsCapturing an imageYou can use a bitmap to capture an image, and you can store the captured image in memory, display it at a different location in your application //'s window, or display it in another wi

Use of GDI objects and prevent resource leakage

When a recent project draws a large amount of collected data, it may cause a program crash due to memory leakage. After repeated speculation, it may be due to the release of the GDI object. Now we can find the following online experience, it should be helpfulUse of GDI objects and prevent resource leakageFor programming on the Windows series, GDI is a very important technical point. Many programs run abnormally many times, except for the well-known memory leakage, the leakage of GDI resources is

Windows Mobile UI development

. Drawing basics of GDI (the basics must be mastered)1.1 device environment DCDevice context (DC) is a tool used by windows to manage access to display and print devices.1) What is DC?A dc is a structure that defines a collection of graphic objects and their related attributes, as well as some graphics modes that affect the output effect.These graphic objects inc

LDAP quick installation

1. Obtain Software Http://www.openldap.org/software/download/Http://www.openldap.org/software/repo.html 2. DecompressGunzip-C openldap-VERSION.tgz | tar xfb-An LDAP subdirectory is generated in the current working directory. 3. read readme and Install carefully 4. Run configure./Configure View configure options./Configure -- Help 5. CompileMake dependMake 6. Test the compilation resultCD testsMake CD .. 7. Install softwareSu root-C make install 8. Create a Server Load balancer configuration fil

Sun Xin VC ++ lecture notes-(3, 4)

Single-document program, as well as the relationship between windows and objects. Here, Sun The instructor introduced a button class and its usage, emphasizing the relationship between windows and objects. This is a blind spot for self-taught VC people like me. Sun Xin VC ++ lecture notes-(4) This lesson explains how to use the classwizard of MFC to help us create message ing and message response functions. Next we will explain that DC

How can I find a DNS record that disappears?

One of the disadvantages of the multi-host replication mode for Windows Active Directory applications is that the replication mode changes rapidly, and small errors may become large errors in a short time. Domain Name System (DNS) zones and records may be damaged, including wrong information or even disappear. Find the deleted DNS record DNS records can be manually deleted, and some operations can result in this result, such as DC degradation or other

AD domain Controller dsmod modify command

also be "yes".-reversiblepwd {yes | no}Set Yes (yes) no (no) to store user passwords using reversible encryption.-pwdneverexpires {yes | no}The Set user password is (yes) no (NO) never expires.-acctexpires Account expires at the end of today. The positive value setting expires in the future. Negative settingExpired in the past. The string value "Never" indicates that this account will never expire.-disabled {yes | no} setting Yes (yes) no (NO) disables user accounts.{-S -S AD

AD domain Controller Virtualization complete Chapter

AD domain Controller Virtualization complete ChapterI. On the issue of AD DC virtualization1, time synchronization problemBecause Kerberos authentication relies on reliable time, it is important that time synchronization in the domain be synchronized with the Hyper-V host if DC virtualization is in place, thus creating a series of problems, so it is recommended to disable the time Synchronization service to

Win32 the window of knowledge. The first talk of the window

Win32 Knowledge of the window essence One, abstractWhen I was learning Win32. Many operations are performed by Windows. So today, let's talk about what the nature of the window is.The nature of the window is constantly drawn. Windows is drawn through the message mechanism.We know. Memory is divided into high and low 2G and 2G is used for the application. The height of 2G is used by the operating system. And the operation of our graphics is provided by the operating system through the underlying

Go Database/sql source code Analysis (iv) SQL. STMT data structure

) Prepare (query string) (*stmt, error) = #内部func (db *db) Prepare (query string, strategy Connreus Estrategy) (*stmt, error) = #生成driverConnfunc (db *DB) conn (Strategy Connreusestrategy) (*driverconn, error) = = Func (S *stmt) Exec (args ... interface{}) (Result, error) func (S *stmt) Query (args ... interface{}) (*rows, error) = #有可能使 With prepare, it is also possible to rebind connection func (S *stmt) connstmt (CI *driverconn, releaseconn func (Error), SI driver. STMT, err error) = = #注

Use the. NET sqlbulkcopy class for batch replication

BCP { class Program{ static void Main(){ string cString = "Data Source=(local);User ID=tester;Password=tester;Initial Catalog=Northwind;"; using (SqlConnectionconn = new SqlConnection(cString)) {conn.Open();SqlCommandcomm = new SqlCommand("SELECT FirstName, LastName, HomePhone, Title FROM Employees;", conn);SqlDataReader reader = comm.ExecuteReader(); using (SqlConnection conn2 = new SqlConnection(cString)) { conn2.Open(); using (SqlBulkCopybcp = new SqlBulkCopy(conn2)){DataTabledt = new DataTa

GDI drawing experience

For programming on the Windows series, GDI is a very important technical point. Many programs run abnormally many times, except for the well-known memory leakage, the leakage of GDI resources is also a direct cause. today, I will share some of my experiences in programming with you.1. For the created GDI object, you must use deleteobject to release it. The release sequence is create and then release, and then create.Here, create refers to the GDI function that starts with it, such as createdibit

Example of how to delete a domain controller using ntdsutil

ØC:> ntdsutil ØNtdsutil: Metadata cleanup ØMetadata cleanup: Select Operation target ØSelect Operation target: connections ØServer connections: connect to domain test.com ØSelect Operation target: List sites ØFound 1 site (s) Ø0-Cn = default-first-site-name, Cn = sites, Cn = configuration, Dc = test, Dc = com ØSelect Operation target: Select site 0 ØSite-Cn = default-first-site-name, Cn = sites, Cn

Describes in detail the driving circuit of the MOs.

gate current limit for MOS, that is, the ice limit for Q3 and Q4. When necessary, you can parallel the acceleration capacitor on the R4. This circuit provides the following features: 1. Use low-end voltage and PWM to drive high-end MOS tubes. 2. Use a small PWM signal to drive the mos tubes with high gate voltage requirements. 3. Peak gate voltage limit 4. Input and Output Current limits 5. Low Power Consumption can be achieved by using proper resistance. 6. PWM signal inversion. NMOS does not

The MFC dialog box uses CPrintDialog to implement printing, specifying printers, Background printing

+ = _t ("\ r \ n"); Add end to make it easier to read printed data laterThis->getdlgitem (IDC_COMBO1)->getwindowtextw (Strprintdevice);DWORD Dwflag = Pd_allpages | Pd_nopagenums | pd_usedevmodecopies | Pd_hideprinttofile; Print Configuration Interface button availability, because the background printing, in fact, this configuration has no meaning CPrintDialog Pprintdlg (FALSE, Dwflag, this); CPrintDialog instantiation, because MFC's print device is irrelevant, it can be understood that this is

Full introduction to DDB and DIB bitmap programming in Visual C ++

. loadbitmap (idb_loaded_bitmap); // load the DDB bitmap to be loaded.3: bitmap BMP Info;4: BMP draw. getbitmap ( BMP info); // obtain the size of the DDB bitmap to be loaded.5: CDC memdc; // defines a compatible DC6: cclientdc (this );7: memdc. createcompatibledc ( DC); // create compatible DC8: cbitmap * pbmpold = memdc. SelectObject ( BMP draw); // Save the original DDB and select the new DDB into the DC9: DC

Set an actual Delphi Screen Copy Sequence

 Jia xuejie of youhe Lane, Ningbo City, a real-time Delphi Screen Copy-on-Shell Process ---- Borland Corporation (now renamed as Inprise Corporation) Delphi is the most convenient windows programOne of the tools. Many people use Delphi as the data warehouse to launch a work tool.High-efficiency windows program can be developed at an extremely fast speed. ---- Now we use Delphi to compile an actual Screen Copy Sequence. Look, the painting belowThis is an example of copying shells on the screen of

MFC Window Programming (second edition) essence notes (2)

Ladies and gentlemen, let's take a look at the new big auction! Chapter 2. Drawing in a window Essence concentration: In Windows, GDI (Graphic device interface and graphical device interface) is used to output images ). This is an embodiment of Windows's Hardware-independent graphic output mode. Based on the hardware abstraction layer (HAL), GDI shields the differences between different output devices and provides users with a unified "standard output device ". However, unlike dos, Windows has m

Another modification dialog box background color

Bool ctestkeydlg: onerasebkgnd (CDC * PDC) {// todo: add your message handler code here and/or call defaultcdialog: onerasebkgnd (PDC); hbitmap h_bitmap; h_bitmap = shloadimagefile (L "bg.gif"); If (h_bitmap = NULL) {return false;} bitmap bm; GetObject ( h_bitmap, sizeof (hbitmap), BM ); /* assign a value to an image. */HDC = createcompatibledc (PDC-> getsafehdc ();/* The DC in the memory is only stored in the memory. When a

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