一个关于Textbox的小问题

[zwdreamfly]

请教：一个Textbox，属性设为可写多行文本，如何获得多行文本中任一行的内容呢？（呵呵，也不知道可不可以实现）

[zyl910]

EM_GETLINE
An application sends an EM_GETLINE message to copy a line of text from an edit control and place it in a specified buffer.

EM_GETLINE
wParam = (WPARAM) line; // line number to retrieve
lParam = (LPARAM) (LPCSTR) lpch; // address of buffer for line

Parameters
line
Value of wParam. Specifies the zero-based index of the line to retrieve from a multiline edit control. A value of zero specifies the topmost line. This parameter is ignored by a single-line edit control.
lpch
Value of lParam. Pointer to the buffer that receives a copy of the line. The first word of the buffer specifies the maximum number of characters that can be copied to the buffer.
Return Values
The return value is the number of characters copied. The return value is zero if the line number specified by the line parameter is greater than the number of lines in the edit control.

Remarks
The copied line does not contain a terminating null character.

QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.

[wxqjl007]

Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long,lParam As Any) As Long
Public Const EM_GETLINECOUNT=&HBA
Public Const EM_GETLINE=&HC4
在Form1的代码模块中写如下代码：
Private Sub Command1_Click()
Dim str(256) As Byte
str(1)=1 '最大允许存放256个字符
'获取总行数，结果显示在文本框txtLineCount中
txtlineCount=SendMessage(Text1.hwnd,EM_GETLINECOUNT,0,0)
'获取第3行的数据放在str中，转换为字符串后显示在文本框txtString中
SendMessage Text1.hwnd,EM_GETLINE,2,str(0)
txtString= StrConv(str,vbUnicode)
End Sub

[ZhaoYG23]

up

[xuewei]

当然可以！

[zwdreamfly]

谢……