-->Inheritance ![Box Box](https://i.ytimg.com/vi/p7doZJEh-as/maxresdefault.jpg)
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- Message Box Definition
Definition
Oct 13, 2000 If you do this, take care in the way you change incorrect data back and pop up message boxes that also take focus from the control. The program can finish up in an unfortunate loop of validation and message box display. Some code you may like to play with, is to vary the number of lines of items displayed in the drop down list. New download of DEV C will compile and run sources, then save the source (.cpp) and Application (.exe). DEV C will let me re-load the source, and it will run again. The Application appears to re-load, but it will not run. The ONLY msg I get is that DEV has turned the problem over to our NOD32ANTIVIRUS. I suspect pilot error, but even that.
Displays a message window, also known as a dialog box, which presents a message to the user. It is a modal window, blocking other actions in the application until the user closes it. A MessageBox can contain text, buttons, and symbols that inform and instruct the user.
MessageBox
Examples
The following code example shows how to use a MessageBox to inform the user of a missing entry in a TextBox. This example requires that the method is called from an existing form with a TextBox named ServerName on it.
The following code example shows how to ask the user a yes or no question and make a decision based on the response.
Remarks
You cannot create a new instance of the MessageBox class. To display a message box, call the
static
method MessageBox.Show. The title, message, buttons, and icons displayed in the message box are determined by parameters that you pass to this method.![Box Box](https://i.ytimg.com/vi/p7doZJEh-as/maxresdefault.jpg)
Methods
Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object) |
GetHashCode() | Serves as the default hash function. (Inherited from Object) |
GetType() | Gets the Type of the current instance. (Inherited from Object) |
MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object) |
Show(IWin32Window, String) | Displays a message box in front of the specified object and with the specified text. |
Show(IWin32Window, String, String) | Displays a message box in front of the specified object and with the specified text and caption. Auto tune real time pitch correction. |
Show(IWin32Window, String, String, MessageBoxButtons) | Displays a message box in front of the specified object and with the specified text, caption, and buttons. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon) | Displays a message box in front of the specified object and with the specified text, caption, buttons, and icon. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton) | Displays a message box in front of the specified object and with the specified text, caption, buttons, icon, and default button. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions) | Displays a message box in front of the specified object and with the specified text, caption, buttons, icon, default button, and options. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file and HelpNavigator . |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator, Object) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file, HelpNavigator , and Help topic. |
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, String) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file and Help keyword. |
Show(String) | Displays a message box with specified text. |
Show(String, String) | Displays a message box with specified text and caption. |
Show(String, String, MessageBoxButtons) | Displays a message box with specified text, caption, and buttons. |
Show(String, String, MessageBoxButtons, MessageBoxIcon) | Displays a message box with specified text, caption, buttons, and icon. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton) | Displays a message box with the specified text, caption, buttons, icon, and default button. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions) | Displays a message box with the specified text, caption, buttons, icon, default button, and options. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, Boolean) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file and HelpNavigator . |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator, Object) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file, HelpNavigator , and Help topic. |
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, String) | Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file and Help keyword. |
ToString() | Returns a string that represents the current object. (Inherited from Object) |
Applies to
How To Get The Message Box Back In Dev C 2017
See also
-->A GUI application must respond to events from the user and from the operating system.
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- Events from the user include all the ways that someone can interact with your program: mouse clicks, key strokes, touch-screen gestures, and so on.
- Events from the operating system include anything 'outside' of the program that can affect how the program behaves. For example, the user might plug in a new hardware device, or Windows might enter a lower-power state (sleep or hibernate).
These events can occur at any time while the program is running, in almost any order. How do you structure a program whose flow of execution cannot be predicted in advance?
To solve this problem, Windows uses a message-passing model. The operating system communicates with your application window by passing messages to it. A message is simply a numeric code that designates a particular event. For example, if the user presses the left mouse button, the window receives a message that has the following message code.
Some messages have data associated with them. For example, the WM_LBUTTONDOWN message includes the x-coordinate and y-coordinate of the mouse cursor.
To pass a message to a window, the operating system calls the window procedure registered for that window. (And now you know what the window procedure is for.)
The Message Loop
An application will receive thousands of messages while it runs. (Consider that every keystroke and mouse-button click generates a message.) Additionally, an application can have several windows, each with its own window procedure. How does the program receive all these messages and deliver them to the correct window procedure? The application needs a loop to retrieve the messages and dispatch them to the correct windows.
For each thread that creates a window, the operating system creates a queue for window messages. This queue holds messages for all the windows that are created on that thread. The queue itself is hidden from your program. You cannot manipulate the queue directly. However, you can pull a message from the queue by calling the GetMessage function.
This function removes the first message from the head of the queue. If the queue is empty, the function blocks until another message is queued. The fact that GetMessage blocks will not make your program unresponsive. If there are no messages, there is nothing for the program to do. If you have to perform background processing, you can create additional threads that continue to run while GetMessage waits for another message. (See Avoiding Bottlenecks in Your Window Procedure.)
The first parameter of GetMessage is the address of a MSG structure. If the function succeeds, it fills in the MSG structure with information about the message. This includes the target window and the message code. The other three parameters let you filter which messages you get from the queue. In almost all cases, you will set these parameters to zero.
Although the MSG structure contains information about the message, you will almost never examine this structure directly. Instead, you will pass it directly to two other functions.
The TranslateMessage function is related to keyboard input. It translates keystrokes (key down, key up) into characters. You do not really have to know how this function works; just remember to call it before DispatchMessage. The link to the MSDN documentation will give you more information, if you are curious.
The DispatchMessage function tells the operating system to call the window procedure of the window that is the target of the message. In other words, the operating system looks up the window handle in its table of windows, finds the function pointer associated with the window, and invokes the function.
For example, suppose that the user presses the left mouse button. This causes a chain of events:
- The operating system puts a WM_LBUTTONDOWN message on the message queue.
- Your program calls the GetMessage function.
- GetMessage pulls the WM_LBUTTONDOWN message from the queue and fills in the MSG structure.
- Your program calls the TranslateMessage and DispatchMessage functions.
- Inside DispatchMessage, the operating system calls your window procedure.
- Your window procedure can either respond to the message or ignore it.
When the window procedure returns, it returns back to DispatchMessage. This returns to the message loop for the next message. As long as your program is running, messages will continue to arrive on the queue. Therefore, you must have a loop that continually pulls messages from the queue and dispatches them. You can think of the loop as doing the following: Free morphine vst download.
As written, of course, this loop would never end. That is where the return value for the GetMessage function comes in. Normally, GetMessage returns a nonzero value. When you want to exit the application and break out of the message loop, call the PostQuitMessage function.
The PostQuitMessage function puts a WM_QUIT message on the message queue. WM_QUIT is a special message: It causes GetMessage to return zero, signaling the end of the message loop. Here is the revised message loop.
As long as GetMessage returns a nonzero value, the expression in the while loop evaluates to true. After you call PostQuitMessage, the expression becomes false and the program breaks out of the loop. (One interesting result of this behavior is that your window procedure never receives a WM_QUIT message. Therefore, you do not have to have a case statement for this message in your window procedure.)
The next obvious question is when to call PostQuitMessage. We'll return to this question in the topic Closing the Window, but first we have to write our window procedure.
Posted Messages versus Sent Messages
The previous section talked about messages going onto a queue. Sometimes, the operating system will call a window procedure directly, bypassing the queue.
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The terminology for this distinction can be confusing:
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- Posting a message means the message goes on the message queue, and is dispatched through the message loop (GetMessage and DispatchMessage).
- Sending a message means the message skips the queue, and the operating system calls the window procedure directly.
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For now, the difference is not very important. The window procedure handles all messages. However, some messages bypass the queue and go directly to your window procedure. However, it can make a difference if your application communicates between windows. You can find a more thorough discussion of this issue in the topic About Messages and Message Queues.