VB6 如何对一张图片文件进行缩放后保存
A.bmp 想缩放后保存,如何实现? --------------------编程问答-------------------- 通过picturebox重新paint,然后通过savepicture保存 --------------------编程问答-------------------- 方法很多,搜索一下,网上代码一大堆 --------------------编程问答--------------------不行的。 --------------------编程问答--------------------
根本找不到。有和话发个网址来看。 --------------------编程问答-------------------- 谁说不行的?给出你的代码,几年前就做过类似的程序 --------------------编程问答--------------------
picturebox 没有 savepicture
你能做就发代码来。 --------------------编程问答--------------------
picturebox没有savepicture功能。时间太久了,你糊涂了。。 --------------------编程问答-------------------- 谁说savepicture是picturebox的方法了。savepicture是独立的一个函数,你不清楚可以理解,但是你百度都不百度一下就给出不行二字那就是你的错了。 --------------------编程问答-------------------- --------------------编程问答--------------------
Option Explicit--------------------编程问答-------------------- 既然楼上直接給鱼了,那我给完渔再给鱼吧。
Private Declare Function StretchBlt Lib "gdi32.dll" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Private Const SRCCOPY As Long = &HCC0020
Private Sub Command1_Click()
'保存个铲铲c:\chanchan_1.bmp
SavePicture Picture1.Image, "c:\chanchan_1.bmp"
End Sub
Private Sub Form_Load()
Picture2.ScaleMode = 3
Picture1.ScaleMode = 3
Picture2.AutoRedraw = True
Picture1.AutoRedraw = True
'先在picture2上加载个铲铲
Picture2.Picture = LoadPicture("c:\chanchan.jpg")
'缩放个铲铲到picture1
Call StretchBlt(Picture1.hdc, 0, 0, Picture1.ScaleWidth, Picture1.ScaleHeight, Picture2.hdc, 0, 0, Picture2.ScaleWidth, Picture2.ScaleHeight, SRCCOPY)
'Picture1.Refresh
End Sub
'添加一个Picture1即可
Private Sub Form_Load()--------------------编程问答--------------------
Picture1.AutoRedraw = True
Picture1.Picture = LoadPicture("c:\ 缩放前.jpg")
Picture1.Width = Picture1.Width / 2
Picture1.Height = Picture1.Height / 2
Picture1.PaintPicture Picture1, 0, 0, Picture1.Width, Picture1.Height
SavePicture Picture1.Image, "c:\缩放后.jpg"
End Sub
和我想到一块儿去了,呵呵!
--------------------编程问答--------------------
这样缩放图片会失真,加上HALFTONE缩放模式就可以了.参见: http://topic.csdn.net/u/20080910/20/1ab23882-3cb0-49dc-9b86-eb169e58a823.html
补充:VB , 基础类