84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
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// Copyright 2010 The Walk Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package walk
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import (
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"github.com/lxn/win"
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"syscall"
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)
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// FontMemResource represents a font resource loaded into memory from
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// the application's resources.
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type FontMemResource struct {
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hFontResource win.HANDLE
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}
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func newFontMemResource(resourceName *uint16) (*FontMemResource, error) {
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hModule := win.HMODULE(win.GetModuleHandle(nil))
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if hModule == win.HMODULE(0) {
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return nil, lastError("GetModuleHandle")
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}
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hres := win.FindResource(hModule, resourceName, win.MAKEINTRESOURCE(8) /*RT_FONT*/)
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if hres == win.HRSRC(0) {
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return nil, lastError("FindResource")
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}
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size := win.SizeofResource(hModule, hres)
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if size == 0 {
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return nil, lastError("SizeofResource")
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}
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hResLoad := win.LoadResource(hModule, hres)
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if hResLoad == win.HGLOBAL(0) {
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return nil, lastError("LoadResource")
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}
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ptr := win.LockResource(hResLoad)
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if ptr == 0 {
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return nil, lastError("LockResource")
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}
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numFonts := uint32(0)
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hFontResource := win.AddFontMemResourceEx(ptr, size, nil, &numFonts)
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if hFontResource == win.HANDLE(0) || numFonts == 0 {
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return nil, lastError("AddFontMemResource")
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}
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return &FontMemResource{hFontResource: hFontResource}, nil
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}
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// NewFontMemResourceByName function loads a font resource from the executable's resources
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// using the resource name.
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// The font must be embedded into resources using corresponding operator in the
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// application's RC script.
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func NewFontMemResourceByName(name string) (*FontMemResource, error) {
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lpstr, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return nil, err
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}
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return newFontMemResource(lpstr)
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}
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// NewFontMemResourceById function loads a font resource from the executable's resources
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// using the resource ID.
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// The font must be embedded into resources using corresponding operator in the
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// application's RC script.
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func NewFontMemResourceById(id int) (*FontMemResource, error) {
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return newFontMemResource(win.MAKEINTRESOURCE(uintptr(id)))
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}
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// Dispose removes the font resource from memory
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func (fmr *FontMemResource) Dispose() {
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if fmr.hFontResource != 0 {
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win.RemoveFontMemResourceEx(fmr.hFontResource)
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fmr.hFontResource = 0
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}
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}
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