【VB声明】 Private Declare Function GetTextExtentPoint32 Lib "gdi32" Alias "GetTextExtentPoint32A" (ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As SIZE) As Long【别名】 GetTextExtentPoint32A【说明】 判断一个字串的大小（范围）。在Win32环境中，最好使用GetTextExtentPoint32，它提供了更精确的计算结果 【返回值】 Long，非零表示成功，零表示失败。会设置GetLastError 【备注】 这个函数不会将剪切区考虑在内，但却考虑到了由SetTextCharacterExtra函数设置的任何额外空间（间距）【参数表】 hdc ------------ Long，设备场景的句柄 lpszString ----- String，欲度量其范围（extent）的一个字串 cbString ------- Long，lpszString字串的长度 lpSize --------- SIZE，这个结构用于装载字串范围的高度和宽度信息例子： Private Type POINTAPI X As Long Y As Long End Type Private Type RECT Left As Long Top As Long Right As Long Bottom As Long End Type Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long Private Declare Function ExtTextOut Lib "gdi32" Alias "ExtTextOutA" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal wOptions As Long, ByVal lpRect As Any, ByVal lpString As String, ByVal nCount As Long, lpDx As Long) As Long Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long Private Declare Function GetTextExtentPoint32 Lib "gdi32" Alias "GetTextExtentPoint32A" (ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As POINTAPI) As Long Private Declare Function GetWindowDC Lib "user32" (ByVal hwnd As Long) As Long Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single) 'KPD-Team 1998 'URL: http://www.allapi.net/ 'E-Mail: [email protected] Dim Pt As POINTAPI, mWnd As Long, WR As RECT, nDC As Long Dim TextSize As POINTAPI, CX As Long, CY As Long 'Get the current cursor position GetCursorPos Pt 'Get the window under the cursor mWnd = WindowFromPoint(Pt.X, Pt.Y) 'Get the window's position GetWindowRect mWnd, WR 'Get the window'zs device context nDC = GetWindowDC(mWnd) 'Get the height and width of our text GetTextExtentPoint32 nDC, "Hello !", Len("Hello !"), TextSize For CX = 1 To WR.Right - WR.Left Step TextSize.X For CY = 1 To WR.Bottom - WR.Top Step TextSize.Y 'Draw the text on the window ExtTextOut nDC, CX, CY, 0, ByVal 0&, "Hello !", Len("Hello !"), ByVal 0& Next Next End Sub Private Sub Form_Paint() Me.CurrentX = 0 Me.CurrentY = 0 Me.Print "Click on this form," + vbCrLf + "Hold the mouse button," + vbCrLf + "drag the mouse over another window," + vbCrLf + "release the mouse button" + vbCrLf + "and see what happens!" End Sub
Private Declare Function GetTextExtentPoint32 Lib "gdi32" Alias "GetTextExtentPoint32A" (ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As SIZE) As Long【别名】
GetTextExtentPoint32A【说明】
判断一个字串的大小（范围）。在Win32环境中，最好使用GetTextExtentPoint32，它提供了更精确的计算结果 【返回值】
Long，非零表示成功，零表示失败。会设置GetLastError 【备注】
这个函数不会将剪切区考虑在内，但却考虑到了由SetTextCharacterExtra函数设置的任何额外空间（间距）【参数表】
hdc ------------ Long，设备场景的句柄 lpszString ----- String，欲度量其范围（extent）的一个字串 cbString ------- Long，lpszString字串的长度 lpSize --------- SIZE，这个结构用于装载字串范围的高度和宽度信息例子：
Private Type POINTAPI
X As Long
Y As Long
End Type
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function ExtTextOut Lib "gdi32" Alias "ExtTextOutA" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal wOptions As Long, ByVal lpRect As Any, ByVal lpString As String, ByVal nCount As Long, lpDx As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function GetTextExtentPoint32 Lib "gdi32" Alias "GetTextExtentPoint32A" (ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As POINTAPI) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hwnd As Long) As Long
Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
'KPD-Team 1998
'URL: http://www.allapi.net/
'E-Mail: [email protected]
Dim Pt As POINTAPI, mWnd As Long, WR As RECT, nDC As Long
Dim TextSize As POINTAPI, CX As Long, CY As Long
'Get the current cursor position
GetCursorPos Pt
'Get the window under the cursor
mWnd = WindowFromPoint(Pt.X, Pt.Y)
'Get the window's position
GetWindowRect mWnd, WR
'Get the window'zs device context
nDC = GetWindowDC(mWnd)
'Get the height and width of our text
GetTextExtentPoint32 nDC, "Hello !", Len("Hello !"), TextSize
For CX = 1 To WR.Right - WR.Left Step TextSize.X
For CY = 1 To WR.Bottom - WR.Top Step TextSize.Y
'Draw the text on the window
ExtTextOut nDC, CX, CY, 0, ByVal 0&, "Hello !", Len("Hello !"), ByVal 0&
Next
Next
End Sub
Private Sub Form_Paint()
Me.CurrentX = 0
Me.CurrentY = 0
Me.Print "Click on this form," + vbCrLf + "Hold the mouse button," + vbCrLf + "drag the mouse over another window," + vbCrLf + "release the mouse button" + vbCrLf + "and see what happens!"
End Sub