Character and Line Operations - Win32 Programmer's Reference

Custom Search

Character and Line Operations

The Microsoft® Win32® application programming interface (API) provides several messages that return information about the characters and lines in an edit control. Most of the messages return an index, usually a zero-based number, to refer to a character or line. Given this, a single-line edit control containing n characters, the line index is zero and the characters are indexed from zero to n 1. In a multiline edit control containing m lines and n characters, the lines are indexed from zero to m 1, and the characters are indexed from zero to n 1. Note that character indexing ignores linebreaks.

An application can determine the number of characters in an edit control by sending the WM_GETTEXTLENGTH message to the edit control. This message returns the length, in characters (not including the terminating null character), of the text in a single-line or multiline edit control. The EM_LINELENGTH message returns the length, in characters, of a line specified by the character index of a character in the line. The returned length does not include any selected characters. An application can use these messages in a single-line or multiline edit control.

The EM_GETFIRSTVISIBLELINE message returns the zero-based index of the uppermost visible line in a multiline edit control, or the zero-based index of the first visible character in a single-line edit control. An application can copy a line from an edit control to a buffer by sending the EM_GETLINE message to the edit control. The line is specified by its line index and the first word of the receiving buffer contains the maximum number of bytes to be copied to the buffer. The return value is the number of bytes copied. This message can also be used in a single-line or multiline edit control.

There are unique messages available to return the information about a line in a multiline edit control. The EM_GETLINECOUNT message returns the number of lines in an edit control. An application can determine the index of a character in a specific line by using the EM_LINEFROMCHAR and EM_LINEINDEX messages. The EM_LINEFROMCHAR message returns the index of the line containing a specified character index. This message is the reverse of the EM_LINEINDEX message, which returns the index of the first character in a specified line.

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network