如何获得桌面指定位置的背景，放到窗体上？

[sss2002]

如何获得桌面指定位置的背景，放到窗体上？

比如，桌面是 1024*768，我要从 X、Y 获得，大小为 W、H。

然后绘到我的窗体上，性能最快的方式是什么？

请给出代码，不要就给几个 API ，偶要看代码的 -_-

[sss2002]

额的神阿，好多乱码~~~~

[hn123]

在一樓的基礎加了點東東。

新建一個窗體，放一PICTUREBOX 就可以了、


－－－－－－－－－－－－－－－－－－－
Option Explicit

'²¶×½ÆÁÄ»µÄͼÏñ

Private Type PALETTEENTRY
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End Type

Private Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY
End Type

Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type

Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104

Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal iCapabilitiy As Long) As Long
Private Declare Function GetSystemPaletteEntries Lib "gdi32" (ByVal hdc As Long, ByVal wStartIndex As Long, ByVal wNumEntries As Long, lpPaletteEntries As PALETTEENTRY) As Long
Private Declare Function CreatePalette Lib "gdi32" (lpLogPalette As LOGPALETTE) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function SelectPalette Lib "gdi32" (ByVal hdc As Long, ByVal hPalette As Long, ByVal bForceBackground As Long) As Long
Private Declare Function RealizePalette Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hdc As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long

Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type

Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPictureDisp) As Long

'²¶×½Í¼Ïó
Public Function CaptureScreen(x As Long, y As Long, w As Long, h As Long) As Picture
Dim hWndScreen As Long

'»ñµÃ×ÀÃæµÄ´°¿Ú¾ä±ú
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, x, y, w, h)
End Function

Public Function CaptureWindow(ByVal hWndSrc As Long, ByVal Client As Boolean, ByVal _
LeftSrc As Long, ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc _
As Long) As Picture

Dim hDCMemory As Long
Dim hBmp As Long
Dim hBmpPrev As Long
Dim r As Long
Dim hDCSrc As Long
Dim hPal As Long
Dim hPalPrev As Long
Dim RasterCapsScrn As Long
Dim HasPaletteScrn As Long
Dim PaletteSizeScrn As Long
Dim LogPal As LOGPALETTE

If Client Then
hDCSrc = GetDC(hWndSrc)
Else
hDCSrc = GetWindowDC(hWndSrc)
End If

hDCMemory = CreateCompatibleDC(hDCSrc)
hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
hBmpPrev = SelectObject(hDCMemory, hBmp)

'»ñµÃÆÁÄ»ÊôÐÔ
RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)
HasPaletteScrn = RasterCapsScrn And RC_PALETTE
PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE)

'Èç¹ûÆÁÄ»¶ÔÏóÓе÷É«°åÔò»ñµÃÆÁÄ»µ÷É«°å
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
'½¨Á¢ÆÁÄ»µ÷É«°åµÄ¿½±´
LogPal.palVersion = &H300
LogPal.palNumEntries = 256
r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
hPal = CreatePalette(LogPal)
'½«Ð½¨Á¢µÄµ÷É«°åÑ¡È罨Á¢µÄÄÚ´æ»æͼ¾ä±úÖÐ
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If

'¿½±´Í¼Ïó
r = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)

hBmp = SelectObject(hDCMemory, hBmpPrev)

If HasPaletteScrn And (PaletteSizeScrn = 256) Then
hPal = SelectPalette(hDCMemory, hPalPrev, 0)
End If

'ÊÍ·Å×ÊÔ´
r = DeleteDC(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc)

Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function


Private Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
Dim r As Long

Dim Pic As PicBmp
Dim IPic As IPicture
Dim IID_IDispatch As GUID

'Ìî³äIDispatch½çÃæ
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With

'Ìî³äPic
With Pic
.Size = Len(Pic) ' Pic½á¹¹³¤¶È
.Type = vbPicTypeBitmap ' ͼÏóÀàÐÍ
.hBmp = hBmp ' λͼ¾ä±ú
.hPal = hPal ' µ÷É«°å¾ä±ú
End With

'½¨Á¢PictureͼÏó
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)

'·µ»ØPicture¶ÔÏó
Set CreateBitmapPicture = IPic
End Function

Private Sub Form_Load()
Set Me.Picture1.Picture = CaptureScreen(0, 0, 800, 600)
End Sub


------------------
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努力就有美好時光！

[province_]

上面代码是把HDC的内容保存为BMP文件，再加载到图片框，如果你不需要文件形式的话可以直接把内容拷贝到你的窗体HDC的，简单很多。

[sss2002]

(雍昊) ,对，我就是要直接把我要的 COPY 到我的 HDC ，不需要中间进行转存

给简单的代码吧 -_-

[迈克揉索芙特]

Option Explicit

'²¶×½ÆÁÄ»µÄͼÏñ

Private Type PALETTEENTRY
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End Type

Private Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY
End Type

Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type

Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104

Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal iCapabilitiy As Long) As Long
Private Declare Function GetSystemPaletteEntries Lib "gdi32" (ByVal hdc As Long, ByVal wStartIndex As Long, ByVal wNumEntries As Long, lpPaletteEntries As PALETTEENTRY) As Long
Private Declare Function CreatePalette Lib "gdi32" (lpLogPalette As LOGPALETTE) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function SelectPalette Lib "gdi32" (ByVal hdc As Long, ByVal hPalette As Long, ByVal bForceBackground As Long) As Long
Private Declare Function RealizePalette Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hdc As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long

Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type

Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPictureDisp) As Long

'²¶×½Í¼Ïó
Public Function CaptureScreen(x As Long, y As Long, w As Long, h As Long) As Picture
Dim hWndScreen As Long

'»ñµÃ×ÀÃæµÄ´°¿Ú¾ä±ú
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, x, y, w, h)
End Function

Public Function CaptureWindow(ByVal hWndSrc As Long, ByVal Client As Boolean, ByVal _
LeftSrc As Long, ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc _
As Long) As Picture

Dim hDCMemory As Long
Dim hBmp As Long
Dim hBmpPrev As Long
Dim r As Long
Dim hDCSrc As Long
Dim hPal As Long
Dim hPalPrev As Long
Dim RasterCapsScrn As Long
Dim HasPaletteScrn As Long
Dim PaletteSizeScrn As Long
Dim LogPal As LOGPALETTE

If Client Then
hDCSrc = GetDC(hWndSrc)
Else
hDCSrc = GetWindowDC(hWndSrc)
End If

hDCMemory = CreateCompatibleDC(hDCSrc)
hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
hBmpPrev = SelectObject(hDCMemory, hBmp)

'»ñµÃÆÁÄ»ÊôÐÔ
RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)
HasPaletteScrn = RasterCapsScrn And RC_PALETTE
PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE)

'Èç¹ûÆÁÄ»¶ÔÏóÓе÷É«°åÔò»ñµÃÆÁÄ»µ÷É«°å
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
'½¨Á¢ÆÁÄ»µ÷É«°åµÄ¿½±´
LogPal.palVersion = &H300
LogPal.palNumEntries = 256
r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
hPal = CreatePalette(LogPal)
'½«Ð½¨Á¢µÄµ÷É«°åÑ¡È罨Á¢µÄÄÚ´æ»æͼ¾ä±úÖÐ
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If

'¿½±´Í¼Ïó
r = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)

hBmp = SelectObject(hDCMemory, hBmpPrev)

If HasPaletteScrn And (PaletteSizeScrn = 256) Then
hPal = SelectPalette(hDCMemory, hPalPrev, 0)
End If

'ÊÍ·Å×ÊÔ´
r = DeleteDC(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc)

Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function


Private Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
Dim r As Long

Dim Pic As PicBmp
Dim IPic As IPicture
Dim IID_IDispatch As GUID

'Ìî³äIDispatch½çÃæ
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With

'Ìî³äPic
With Pic
.Size = Len(Pic) ' Pic½á¹¹³¤¶È
.Type = vbPicTypeBitmap ' ͼÏóÀàÐÍ
.hBmp = hBmp ' λͼ¾ä±ú
.hPal = hPal ' µ÷É«°å¾ä±ú
End With

'½¨Á¢PictureͼÏó
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)

'·µ»ØPicture¶ÔÏó
Set CreateBitmapPicture = IPic
End Function