Windows API functions (1)

I Message

1. wm_ncactivate

When the customer zone is about to display active or inactive,Wm_ncactivateThe message is sent to the window. A window uses itsWindowprocFunction to obtain the message.

Lresult callback windowproc (

Hwnd, // handle to window

Uint umsg, // wm_ncactivate

Wparam, // new state (bool)

Lparam // not used

);

Parameters:

Wparam

Specifies the time when the title bar or icon displays the active or inactive status. If the title bar or icon is to be duplicatedWparamThe value isTrue. For inactive title bars or icons,WparamThe parameter isFalse.

Lparam

This parameter is not used

Return Value

When the ParameterWparamYesFalse, ApplicationProgramShould ReturnTrueTo indicate that the system should take the default processing. Or returnFalseTo prevent the title bar or icon from being activated. When the ParameterWparamYesTrueThe returned value is ignored.

2. Functions

1.Addfontresource

FunctionAddfontresourceAdd the font Resources in the specified file to the system font table. After that, the font can be used by all subsequent programs. Extended version:Addfontresourceex ();

Int addfontresource (

Lpctstr lpszfilename // font file name

);

Parameters

Lpszfilename

[In]The file name that contains the Font Resource.

2.Enumfontfamliliesex

FunctionEnumfontfamliliesexAll matches in enumeration systemLplogfontFont of the font features. FunctionEnumfontfamliliesexIt is enumerated Based on the font name, character set, or both.

Int enumfontfamiliesex (

HDC, // handle to DC

Lplogfont, // font information

Fontenumproc lpenumfontfamexproc, // callback function

Lparam, // additional data

DWORD dwflags // not used; must be 0

);

Parameters

HDC

[In]The handle pointing to the device environment.

Lplogfont

PointLogfontStructure pointer, which contains information about the font to be enumerated. This function checks the following members.

Member	Description
Lfcharset	If it is setDefault_charsetThis function will enumerate all character sets. If it is set to a valid character set value, the function will only use a local font from the specified character muscles.
Lffacename	If it is set to null, the function will enumerate a font in each name. If it is set to a valid font name, the function will enumerate all fonts with the specified name.
Lfpitchandfamily	It must be zero.

Lpenumfontfamexproc

[In]Pointer to the emblem function defined by the application.

Lparam

[In]Specifies the value defined by the application. This function will pass the value back to the Hui call function.

Dwflags

Not used, must be0.

Return Value

The Return Value refers to the final return value of the callback function.

3. FunctionEnumfontfamexprocIs a callback function defined by an application.EnumfontfamiliesexUsed. It is mainly used to process fonts. Each time a font is enumerated, it is called once.

Int callback enumfontfamexproc (

Enumlogfontex * lpelfe, // logical-font data

Newtextmetricex * lpntme, // physical-font data

DWORD fonttype, // type of font

Lparam // application-defined data

);

Parameters

Lpelfe

Point toEnumlogfontexStructure, which contains some information about the logical attributes of the font.

Lpntme

A structure containing the physical attributes of the font.

Fonttype

Specifies the font style ., It can be a combination of the following values.

Device_fonttype
Raster_fonttype
Truetype_fonttype

Lparam

[In]Specifies the value defined by the application.EnumfontfamiliesexPassed.

Return values

If you want to continue enumeration, the returned value must not be0To stop enumeration, you must return0.