VB中滑动鼠标中键缩放图片

最新推荐文章于 2025-06-20 13:27:11 发布

Dengyu1997

最新推荐文章于 2025-06-20 13:27:11 发布

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分类专栏： VB/VB.NET 文章标签： vb function constants user integer api

本文链接：https://blog.youkuaiyun.com/Dengyu1997/article/details/624000

这篇博客介绍了如何在VB中使用API函数实现鼠标滚轮操作来缩放图片。通过定义常量、声明API函数，以及自定义窗口过程，实现了当用户滚动鼠标中键时，图片会相应地放大或缩小。

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'// Author: Qf
modSubClass.bas
Option Explicit

'// BitBlt API dwRop parameter constants
Private Const SRCAND = &H8800C6          ' (DWORD) dest = source AND dest
Private Const SRCCOPY = &HCC0020         ' (DWORD) dest = source
Private Const SRCERASE = &H440328        ' (DWORD) dest = source AND (NOT dest )
Private Const SRCINVERT = &H660046       ' (DWORD) dest = source XOR dest
Private Const SRCPAINT = &HEE0086        ' (DWORD) dest = source OR dest
Private Const SRCMERGEPAINT = &HBB0226
Private Const SRCDSNA = &H220326
'// SetStretchBltMode API nStretchMode parameter constants
Private Const STRETCH_ANDSCANS = 1
Private Const STRETCH_ORSCANS = 2
Private Const STRETCH_DELETESCANS = 3
Private Const STRETCH_HALFTONE = 4

Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hDC As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hDC As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hD