vb图形编程问题~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[subzero]

setbitmapbits的用法我知道，现在有1个256色的位图，我直接open文件，分别得到它的位图数据和调色板，创建一个BitMap句柄，然后通过怎样的步骤把得到的位图数据setbitmapbits到这个BitMap句柄里面，然后bitblt到窗体上去，现在的条件是不管当前windows的分辨率为何，希望能得到正确的图像，请问怎么做？？？

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up

[wbdx]

你说的没有什么问题吧！
将得到位图数据放到 byte() 数组中
再 setbitmapbits(bmp句柄,长度，数组）不就可以了吗

[subzero]

因为是256色的位图，所以位图数据是调色板的索引值，这样当你的屏幕分辨率不是8位的时候，bitblt出来的东东可是乱七八糟的呀！
这个问题的重点在于怎样通过得到的调色板数据重新整合为图数据，最后得到正确的图形，是否可用selectpalette等palette系列api解决？怎样解决？

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[kyuwong]

SetDIBits 使用这个吧，虽然这个复杂很多，但不会出现兼容的问题。

[subzero]

感谢，请详细说明

[kyuwong]

你看一看这一贴
http://www.csdn.net/expert/topic/176/176451.shtm

[wbdx]

Public Type
palVersion As Integer 版本你试一试 &h300
palNumEntries As Integer 为颜色数
palPalEntry(255) As PALETTEENTRY 255是颜色数
End Type

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

用 copymemery 复制调色板数据到 LOGPALETTE.palPalEntry()
createoalette() 建立句柄
然后 selectpalette 再试一试

[subzero]

是否是用SetDIBitsToDevice把数组直接写到dc里面，可以绕开bitmap了？

[subzero]

可是调色板的问题怎么解决？

[subzero]

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[kyuwong]

你首先将调色板数据和图像数据分开。

Private Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Private Type BITMAPINFOHEADER '40 bytes
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type BITMAPINFO_1BPP
bmiHeader As BITMAPINFOHEADER
bmiColors(0 To 1) As RGBQUAD
End Type
Private Type BITMAPINFO_4BPP
bmiHeader As BITMAPINFOHEADER
bmiColors(0 To 15) As RGBQUAD
End Type
Private Type BITMAPINFO_8BPP
bmiHeader As BITMAPINFOHEADER
bmiColors(0 To 255) As RGBQUAD
End Type
Private Type BITMAPINFO_ABOVE8
bmiHeader As BITMAPINFOHEADER
End Type

Private Const DIB_PAL_COLORS = 1 ' color table in palette indices
Private Const DIB_PAL_INDICES = 2 ' No color table indices into surf palette
Private Const DIB_PAL_LOGINDICES = 4 ' No color table indices into DC palette
Private Const DIB_PAL_PHYSINDICES = 2 ' No color table indices into surf palette
Private Const DIB_RGB_COLORS = 0 ' color table in RGBs

Private Declare Function GetDIBits Lib "gdi32" (ByVal hdc As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As Any, ByVal wUsage As Long) As Long
Private Declare Function SetDIBits Lib "gdi32" (ByVal hdc As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO, ByVal wUsage As Long) As Long


Private Sub Command1_Click()
On Error Resume Next
Dim tBI As BITMAPINFO_8BPP
Dim Bit() As Byte, lSize1 As Long
With tBI.bmiHeader
.biSize = Len(tBI.bmiHeader)
.biWidth = 图片宽
.biHeight = 图片高
.biPlanes = 1
.biBitCount = 8
.biCompression = BI_RGB
End With

'调色数据
For i = 0 To 255
tBI.bmiColors(i).rgbRed = r
tBI.bmiColors(i).rgbGreen = g
tBI.bmiColors(i).rgbBlue = b
Next

'P是图片框
lSize1 = 图片宽
lSize1 = lSize1 * 3
lSize1 = ((lSize1 + 3) / 4) * 4
lSize1 = lSize1 * 图片高

'bit()是图像数据
SetDIBits P.hdc, hbmp, 0, 图片高, Bit(0), tBI, DIB_RGB_COLORS

End Sub

[subzero]

我看了msdn说调色板位图需要DIB_PAL_COLORS参数，而且还有一个setdibcolortable可以使用，请解释，非常感谢

[subzero]

Dim BFH As BITMAPFILEHEADER
Dim BIH As BITMAPINFOHEADER
Dim BMPBits() As Byte
Dim FN As Long
Dim picTmp As Long, h As Long
Dim BI As BITMAPINFO

FN = FreeFile
Open sFileName For Binary As #FN
Get #FN, , BFH
Get #FN, , BI.bmiHeader
ReDim BMPBits(BI.bmiHeader.biWidth * BI.bmiHeader.biHeight)
Get #FN, , BI.bmiColors()
Seek #FN, 1078
Get #FN, , BMPBits()
Close #FN

picTmp = CreateDIBSection(GetDC(0), BI, DIB_PAL_COLORS, ByVal 0&, ByVal 0&, ByVal 0&)

h = CreateCompatibleDC(GetDC(0))

SetDIBits h, picTmp, 0, BI.bmiHeader.biHeight, BMPBits(0), BI, DIB_PAL_COLORS
SelectObject h, picTmp
SetDIBColorTable h, 0, 256, BI.bmiColors(0)
DeleteObject picTmp


象这样能够图形是对的，但是颜色是乱的，请问怎样才正确？？？

[subzero]

自己解决了，用DIB_RGB_COLORS参数一切搞定，给分了...