DRAWTEXTPARAMS
The DRAWTEXTPARAMS structure contains extended formatting options for the DrawTextEx function.typedef struct {
UINT cbSize;
int iTabLength;
int iLeftMargin;
int iRightMargin;
UINT uiLengthDrawn;
} DRAWTEXTPARAMS, FAR *LPDRAWTEXTPARAMS;
Members
cbSize
Specifies the structure size, in bytes.
iTabLength
Specifies the size of each tab stop, in units equal to the average character width.
iLeftMargin
Specifies the left margin, in units equal to the average character width.
iRightMargin
Specifies the right margin, in units equal to the average character width.
uiLengthDrawn
Receives the number of characters processed by DrawTextEx, including white-space characters. The number can be the length of the string or the index of the first line that falls below the drawing area. Note that DrawTextEx always processes the entire string if the DT_NOCLIP formatting flag is specified.
QuickInfo
Windows NT: Requires version 4.0 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
The DRAWTEXTPARAMS structure contains extended formatting options for the DrawTextEx function.typedef struct {
UINT cbSize;
int iTabLength;
int iLeftMargin;
int iRightMargin;
UINT uiLengthDrawn;
} DRAWTEXTPARAMS, FAR *LPDRAWTEXTPARAMS;
Members
cbSize
Specifies the structure size, in bytes.
iTabLength
Specifies the size of each tab stop, in units equal to the average character width.
iLeftMargin
Specifies the left margin, in units equal to the average character width.
iRightMargin
Specifies the right margin, in units equal to the average character width.
uiLengthDrawn
Receives the number of characters processed by DrawTextEx, including white-space characters. The number can be the length of the string or the index of the first line that falls below the drawing area. Note that DrawTextEx always processes the entire string if the DT_NOCLIP formatting flag is specified.
QuickInfo
Windows NT: Requires version 4.0 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
解决方案 »
- 比较listview某列数据大小
- 水晶报表打印的问题
- 关于word的打印预览问题,解决问题马上结贴!!!!
- 如何绑定datacombo控件与数据库中表的某一列,看一下这个代码是不是有问题啊?
- 如何使用windows media player 9.0 控件来播放音乐?如何添加列表并播放呢?
- 修改并保存Excel文件
- 请问用API函数怎么样控制系统托盘里的图标是否显示
- 请问如何干掉瑞星的进程
- 如何实现无标题栏的窗体的自由拖动
- 请问如何在自己编写的收发e-mail程序
- 请问CreateCaret函数的hBitmap参数怎样获得?
- 急,送分500,参加者都有分!!如何把自已的电脑变成面向全球的服务器,并提供空间域名租用服务!!
The DrawTextEx function draws formatted text in the specified rectangle.int DrawTextEx(
HDC hdc, // handle to device context
LPTSTR lpchText, // pointer to string to draw
int cchText, // length of string to draw
LPRECT lprc, // pointer to rectangle coordinates
UINT dwDTFormat, // formatting options
LPDRAWTEXTPARAMS lpDTParams // pointer to struct with options
);
Parameters
hdc
Handle to the device context to draw in.
lpchText
Pointer to the string to draw. The string must be null-terminated if the cchText parameter is –1.
If dwDTFormat includes DT_MODIFYSTRING, the function could add up to four additional characters to this string. The buffer containing the string should be large enough to accommodate these extra characters. cchText
Specifies the length, in characters, of the string specified by the lpchText parameter. If the string is null-terminated, this parameter can be –1 to calculate the length.
lprc
Pointer to a RECT structure that contains the rectangle, in logical coordinates, in which the text is to be formatted.
dwDTFormat
Specifies formatting options. This parameter can be one or more of these values: Value Meaning
DT_BOTTOM Justifies the text to the bottom of the rectangle. This value must be combined with DT_SINGLELINE.
DT_CALCRECT Determines the width and height of the rectangle. If there are multiple lines of text, DrawTextEx uses the width of the rectangle pointed to by the lprc parameter and extends the base of the rectangle to bound the last line of text. If there is only one line of text, DrawTextEx modifies the right side of the rectangle so that it bounds the last character in the line. In either case, DrawTextEx returns the height of the formatted text, but does not draw the text.
DT_CENTER Centers text horizontally in the rectangle.
DT_EDITCONTROL Duplicates the text-displaying characteristics of a multiline edit control. Specifically, the average character width is calculated in the same manner as for an edit control, and the function does not display a partially visible last line.
DT_END_ELLIPSIS or DT_PATH_ELLIPSIS Replaces part of the given string with ellipses, if necessary, so that the result fits in the specified rectangle. The given string is not modified unless the DT_MODIFYSTRING flag is specified.
You can specify DT_END_ELLIPSIS to replace characters at the end of the string, or DT_PATH_ELLIPSIS to replace characters in the middle of the string. If the string contains backslash (\) characters, DT_PATH_ELLIPSIS preserves as much as possible of the text after the last backslash.
DT_EXPANDTABS Expands tab characters. The default number of characters per tab is eight.
DT_EXTERNALLEADING Includes the font external leading in line height. Normally, external leading is not included in the height of a line of text.
DT_INTERNAL Uses the system font to calculate text metrics.
DT_LEFT Aligns text to the left.
DT_MODIFYSTRING Modifies the given string to match the displayed text. This flag has no effect unless the DT_END_ELLIPSIS or DT_PATH_ELLIPSIS flag is specified.
DT_NOCLIP Draws without clipping. DrawTextEx is somewhat faster when DT_NOCLIP is used.
DT_NOPREFIX Turns off processing of prefix characters. Normally, DrawTextEx interprets the ampersand (&) mnemonic-prefix character as a directive to underscore the character that follows, and the double ampersand (&&) mnemonic-prefix characters as a directive to print a single ampersand. By specifying DT_NOPREFIX, this processing is turned off.
DT_RIGHT Aligns text to the right.
DT_RTLREADING Layout in right to left reading order for bi-directional text when the font selected into the hdc is a Hebrew or Arabic font. The default reading order for all text is left to right.
DT_SINGLELINE Displays text on a single line only. Carriage returns and linefeeds do not break the line.
DT_TABSTOP Sets tab stops. The DRAWTEXTPARAMS structure pointed to by the lpDTParams parameter specifies the number of average character widths per tab stop.
DT_TOP Top justifies text (single line only).
DT_VCENTER Centers text vertically (single line only).
DT_WORDBREAK Breaks words. Lines are automatically broken between words if a word extends past the edge of the rectangle specified by the lprc parameter. A carriage return-linefeed sequence also breaks the line.
DT_WORD_ELLIPSIS Truncates text that does not fit in the rectangle and adds ellipses.
dwDTParams
Pointer to a DRAWTEXTPARAMS structure that specifies additional formatting options. This parameter can be NULL.
Return Values
If the function succeeds, the return value is the text height.If the function fails, the return value is zero. Windows NT: To get extended error information, callGetLastError.QuickInfo
Windows NT: Requires version 4.0 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Import Library: Use user32.lib.
Unicode: Implemented as Unicode and ANSI versions on Windows NT.See Also
Fonts and Text Overview, Font and Text Functions, DrawText, DRAWTEXTPARAMS
Public Const DT_CENTER = &H1
Public Const DT_WORDBREAK = &H10
Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Declare Function DrawTextEx Lib "user32" Alias "DrawTextExA" (ByVal hDC As Long, ByVal lpsz As String, ByVal n As Long, lpRect As RECT, ByVal un As Long, ByVal lpDrawTextParams As Any) As Long
Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long
Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Global Cnt As Long, sSave As String, sOld As String, Ret As String
Dim Tel As Long
Function GetPressedKey() As String
For Cnt = 32 To 128
'Get the keystate of a specified key
If GetAsyncKeyState(Cnt) <> 0 Then
GetPressedKey = Chr$(Cnt)
Exit For
End If
Next Cnt
End Function
Sub TimerProc(ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long)
Ret = GetPressedKey
If Ret <> sOld Then
sOld = Ret
sSave = sSave + sOld
End If
End Sub'In a form
Private Sub Form_Load()
'KPD-Team 1999
'URL: http://www.allapi.net/
'E-Mail: [email protected]
Me.Caption = "Key Spy"
'Create an API-timer
SetTimer Me.hwnd, 0, 1, AddressOf TimerProc
End Sub
Private Sub Form_Paint()
Dim R As RECT
Const mStr = "Start this project, go to another application, type something, switch back to this application and unload the form. If you unload the form, a messagebox with all the typed keys will be shown."
'Clear the form
Me.Cls
'API uses pixels
Me.ScaleMode = vbPixels
'Set the rectangle's values
SetRect R, 0, 0, Me.ScaleWidth, Me.ScaleHeight
'Draw the text on the form
DrawTextEx Me.hDC, mStr, Len(mStr), R, DT_WORDBREAK Or DT_CENTER, ByVal 0&
End Sub
Private Sub Form_Resize()
Form_Paint
End Sub
Private Sub Form_Unload(Cancel As Integer)
'Kill our API-timer
KillTimer Me.hwnd, 0
'Show all the typed keys
MsgBox sSave
End Sub