如何确定 HICON 中图标的大小？

Question

我有一个由 HICON 句柄标识的图标，我想将其绘制在自定义控件的中心。

如何确定图标的大小以便计算正确的绘图位置？

Answer 1

这是代码的 C++ 版本：

struct MYICON_INFO
{
    int     nWidth;
    int     nHeight;
    int     nBitsPerPixel;
};

MYICON_INFO MyGetIconInfo(HICON hIcon);

// =======================================

MYICON_INFO MyGetIconInfo(HICON hIcon)
{
    MYICON_INFO myinfo;
    ZeroMemory(&myinfo, sizeof(myinfo));

    ICONINFO info;
    ZeroMemory(&info, sizeof(info));

    BOOL bRes = FALSE;

    bRes = GetIconInfo(hIcon, &info);
    if(!bRes)
        return myinfo;

    BITMAP bmp;
    ZeroMemory(&bmp, sizeof(bmp));

    if(info.hbmColor)
    {
        const int nWrittenBytes = GetObject(info.hbmColor, sizeof(bmp), &bmp);
        if(nWrittenBytes > 0)
        {
            myinfo.nWidth = bmp.bmWidth;
            myinfo.nHeight = bmp.bmHeight;
            myinfo.nBitsPerPixel = bmp.bmBitsPixel;
        }
    }
    else if(info.hbmMask)
    {
        // Icon has no color plane, image data stored in mask
        const int nWrittenBytes = GetObject(info.hbmMask, sizeof(bmp), &bmp);
        if(nWrittenBytes > 0)
        {
            myinfo.nWidth = bmp.bmWidth;
            myinfo.nHeight = bmp.bmHeight / 2;
            myinfo.nBitsPerPixel = 1;
        }
    }

    if(info.hbmColor)
        DeleteObject(info.hbmColor);
    if(info.hbmMask)
        DeleteObject(info.hbmMask);

    return myinfo;
}

Answer 2

Win32 GetIconInfo 调用将返回图标的源位图作为其响应的一部分。您可以从中获取图标图像的大小。

Dim IconInf As IconInfo
Dim BMInf As Bitmap

If (GetIconInfo(hIcon, IconInf)) Then
    If (IconInf.hbmColor) Then ' Icon has colour plane
        If (GetObject(IconInf.hbmColor, Len(BMInf), BMInf)) Then
            Width = BMInf.bmWidth
            Height = BMInf.bmHeight
            BitDepth = BMInf.bmBitsPixel
        End If

        Call DeleteObject(IconInf.hbmColor)
    Else ' Icon has no colour plane, image data stored in mask
        If (GetObject(IconInf.hbmMask, Len(BMInf), BMInf)) Then
            Width = BMInf.bmWidth
            Height = BMInf.bmHeight \ 2
            BitDepth = 1
        End If
    End If

    Call DeleteObject(IconInf.hbmMask)
End If 

Answer 3

这是代码的 Python 版本：

import win32gui

hIcon = some_icon
info = win32gui.GetIconInfo(hIcon)

if info:
    if info[4]: # Icon has colour plane
        bmp = win32gui.GetObject(info[4])
        
        if bmp:
            Width = bmp.bmWidth
            Height = bmp.bmHeight
            BitDepth = bmp.bmBitsPixel
    else: # Icon has no colour plane, image data stored in mask
        bmp = win32gui.GetObject(info[4])
        
        if bmp:
            Width = bmp.bmWidth
            Height = bmp.bmHeight // 2
            BitDepth = 1

    info[3].close()
    info[4].close()