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1、利用VB捕捉并保存屏幕图像大家知道在VB下利用API函数Bitblt可以将屏幕或者窗口上的图象拷贝到VB中的PictureBox对象中,但是如果简单的利用PictureBox的SavePicture函数来保存图象，会发现什么也保存不了。这篇文章就是介绍如何捕获并利用Windows下的OLEAPI函数保存图象。 首先来看源程序，首先建立一个新的工程文件，然后在Form1中加入5个CommandButton对象和一个PictureBox对象，然后在Form1中加入以下代码：OptionExplicitOptionB
2、ase0PrivateTypePALETTEENTRY peRedAsByte peGreenAsByte peBlueAsByte peFlagsAsByteEndTypePrivateTypeLOGPALETTE palVersionAsInteger palNumEntriesAsInteger palPalEntry(255)AsPALETTEENTRYEndTypePrivateTypeGUID Data1AsLong Data2AsInteger Data3AsInteger Data4(7)AsBy
3、teEndTypePrivateConstRASTERCAPSAsLong=38PrivateConstRC_PALETTEAsLong=&H100PrivateConstSIZEPALETTEAsLong=104PrivateTypeRECT LeftAsLong TopAsLong RightAsLong BottomAsLongEndTypePrivateDeclareFunctionCreateCompatibleDCLib"GDI32"(ByValhDCAsLong)AsLongPrivateDecla
4、reFunctionCreateCompatibleBitmapLib"GDI32"(ByValhDCAsLong,_ ByValnWidthAsLong,ByValnHeightAsLong)AsLongPrivateDeclareFunctionGetDeviceCapsLib"GDI32"(ByValhDCAsLong,ByVal_ iCapabilitiyAsLong)AsLongPrivateDeclareFunctionGetSystemPaletteEntriesLib"GDI32"(B
5、yValhDCAsLong,_ ByValwStartIndexAsLong,ByValwNumEntriesAsLong,lpPaletteEntries_ AsPALETTEENTRY)AsLongPrivateDeclareFunctionCreatePaletteLib"GDI32"(lpLogPaletteAsLOGPALETTE)_ AsLongPrivateDeclareFunctionSelectObjectLib"GDI32"(ByValhDCAsLong,ByValhObje
6、ct_ AsLong)AsLongPrivateDeclareFunctionBitBltLib"GDI32"(ByValhDCDestAsLong,ByValXDestAs_ Long,ByValYDestAsLong,ByValnWidthAsLong,ByValnHeightAsLong,_ ByValhDCSrcAsLong,ByValXSrcAsLong,ByValYSrcAsLong,ByValdwRop_ AsLong)AsLongPrivateDeclareFunction
7、DeleteDCLib"GDI32"(ByValhDCAsLong)AsLongPrivateDeclareFunctionGetForegroundWindowLib"USER32"()AsLongPrivateDeclareFunctionSelectPaletteLib"GDI32"(ByValhDCAsLong,ByValhPalette_ AsLong,ByValbForceBackgroundAsLong)AsLongPrivateDeclareFunctionRealizePaletteLib
8、"GDI32"(ByValhDCAsLong)AsLongPrivateDeclareFunctionGetWindowDCLib"USER32"(ByValhWndAsLong)AsLongPrivateDeclareFunctionGetDCLib"USER32"(ByValhWndAsLong)AsLongPrivateDeclareFunctionGetWindo
