Message Box – Giavapps Windows API

api_messagebox(WindowHandle, Text, Caption, Flags) This function displays a message box.

WindowHandle: Handle to the owner window of the message box to be created.
Text: Text shown in the message box.
Caption: Text in the caption of the message box.
Flags: Flags of the message box. Flags must be separated with the symbol "|".

 

Flags

 

Message Box Types

 

To indicate the buttons displayed in the message box, specify one of the following values:

MB_ABORTRETRYIGNORE The message box contains three push buttons: Abort, Retry, and Ignore.

MB_CANCELTRYCONTINUE The message box contains three push buttons: Cancel, Try Again, Continue. Use this message box type instead of MB_ABORTRETRYIGNORE.

MB_HELP Adds a Help button to the message box. When the user clicks the Help button or presses F1, the system sends a WM_HELP message to the owner.

MB_OK The message box contains one push button: OK. This is the default.

MB_OKCANCEL The message box contains two push buttons: OK and Cancel.

MB_RETRYCANCEL The message box contains two push buttons: Retry and Cancel.

MB_YESNO The message box contains two push buttons: Yes and No.

MB_YESNOCANCEL The message box contains three push buttons: Yes, No, and Cancel.

 

Message Box Icons

 

To display an icon in the message box, specify one of the following values.

MB_ICONEXCLAMATION An exclamation-point icon appears in the message box.

MB_ICONWARNING An exclamation-point icon appears in the message box.

MB_ICONINFORMATION An icon consisting of a lowercase letter i in a circle appears in the message box.

MB_ICONASTERISK An icon consisting of a lowercase letter i in a circle appears in the message box.

MB_ICONQUESTION A question-mark icon appears in the message box. The question-mark message icon is no longer recommended because it does not clearly represent a specific type of message and because the phrasing of a message as a question could apply to any message type. In addition, users can confuse the message symbol question mark with Help information. Therefore, do not use this question mark message symbol in your message boxes. The system continues to support its inclusion only for backward compatibility.

MB_ICONSTOP A stop-sign icon appears in the message box.

MB_ICONERROR A stop-sign icon appears in the message box.

MB_ICONHAND A stop-sign icon appears in the message box.

 

Message Box Default Buttons

 

To indicate the default button, specify one of the following values.

MB_DEFBUTTON1 The first button is the default button. MB_DEFBUTTON1 is the default unless MB_DEFBUTTON2, MB_DEFBUTTON3, or MB_DEFBUTTON4 is specified.

MB_DEFBUTTON2 The second button is the default button.

MB_DEFBUTTON3 The third button is the default button.

MB_DEFBUTTON4 The fourth button is the default button.

 

Message Box Modality

 

To indicate the modality of the dialog box, specify one of the following values.

MB_APPLMODAL The user must respond to the message box before continuing work in the window identified by the hWnd parameter. However, the user can move to the windows of other threads and work in those windows. Depending on the hierarchy of windows in the application, the user may be able to move to other windows within the thread. All child windows of the parent of the message box are automatically disabled, but pop-up windows are not. MB_APPLMODAL is the default if neither MB_SYSTEMMODAL nor MB_TASKMODAL is specified.

MB_SYSTEMMODAL Same as MB_APPLMODAL except that the message box has the WS_EX_TOPMOST style. Use system-modal message boxes to notify the user of serious, potentially damaging errors that require immediate attention (for example, running out of memory). This flag has no effect on the user’s ability to interact with windows other than those associated with WindowHandle.

MB_TASKMODAL Same as MB_APPLMODAL except that all the top-level windows belonging to the current thread are disabled if the WindowHandle parameter is NULL. Use this flag when the calling application or library does not have a window handle available but still needs to prevent input to other windows in the calling thread without suspending other threads.

 

Message Box Options

 

To specify other options, use one or more of the following values.

MB_DEFAULT_DESKTOP_ONLY Same as desktop of the interactive window station. If the current input desktop is not the default desktop, MessageBox does not return until the user switches to the default desktop.

MB_RIGHT The text is right-justified.

MB_RTLREADING Displays message and caption text using right-to-left reading order on Hebrew and Arabic systems.

MB_SETFOREGROUND The message box becomes the foreground window.

MB_TOPMOST The message box is created with the WS_EX_TOPMOST window style.

MB_SERVICE_NOTIFICATION The caller is a service notifying the user of an event. The function displays a message box on the current active desktop, even if there is no user logged on to the computer. Terminal Services: If the calling thread has an impersonation token, the function directs the message box to the session specified in the impersonation token. If this flag is set, the WindowHandle parameter must be NULL. This is so that the message box can appear on a desktop other than the desktop corresponding to the WindowHandle.

 

Return Value

 

If a message box has a Cancel button, the function returns the IDCANCEL value if either the ESC key is pressed or the Cancel button is selected. If the message box has no Cancel button, pressing ESC has no effect.

If the function fails, the return value is zero.

f the function succeeds, the return value is one of the following menu-item values.

IDABORT The Abort button was selected.

IDCANCEL The Cancel button was selected.

IDCONTINUE The Continue button was selected.

IDIGNORE The Ignore button was selected.

IDNO The No button was selected.

IDOK The OK button was selected.

IDRETRY The Retry button was selected.

IDTRYAGAIN The Try Again button was selected.

IDYES The Yes button was selected.

 

Code Examples

 

Showing A Simple Message Box

 

api_messagebox(window_handle(), "MyMessage", "MyCaption", MB_OK);

 

Checking Message Box Buttons

 

getbuttonid = api_messagebox(window_handle(), "MyQuestion?", "MyCaption", MB_YESNO | MB_ICONQUESTION);
if(getbuttonid == IDYES)
{
api_messagebox(window_handle(), "You have clicked on Yes!", "IDYES", MB_OK);
}
else if(getbuttonid == IDNO)
{
api_messagebox(window_handle(), "You have clicked on NO!", "IDNO", MB_OK);
}

 

 

I am Luigi Piscopo, also known as DJ GiDeejay / Producer / Remixer in the music world. I am a Producer with a lot of experience in photo editing, video editing, audio editing, graphic design, web design, programming and promotion.

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