可以使用loadimage windows函数来加载.bmp图像以外的其他图像，例如它可以加载.jpg或.png文件吗？ [英] can loadimage windows function be used to load other images other than .bmp images for instance can it load .jpg or .png files?

问题描述

可以使用loadimage windows函数加载.bmp图像以外的其他图像，例如可以加载.jpg或.png文件吗？

can loadimage windows function be used to load other images other than .bmp images for instance can it load .jpg or .png files?

推荐答案

尽可能请参阅文档 [ ^ ]你只能加载位图，光标和图标。



要加载jpg文件，你需要先将它转换为位图。周围有许多图书馆，可以为您做到这一点。只需在CodeProject上搜索一下。

As you can see in the documentation[^] you can only load bitmaps, cursors, and icons.

To load a jpg-file you will need to convert it first to a bitmap. There are numerous libraries around, which can do that for you. Just search a little on CodeProject.

没有。 LoadImage无法加载任何非常现代的东西。你可以加载bmp，.ico，.cur，这就是它。自从10多年以来，Windows已经包含了GDI +子系统，它或多或少是一个面向对象的改进版GDI。 GDI +可以毫无问题地加载这些其他图像 - 加载Windows本身显示的任何内容 - 包括png，jpg，emf，wmf和其他一些。



这样做相当简单 - 请参阅下面的使用示例。确保链接到Gdiplus库。另请注意，您只需要为每个程序启动/关闭Gdi +一次，这使得我的示例基本上是一个使用gdi +的1行程序。

No. LoadImage cant load anything that's terribly modern. You can load bmp, .ico, .cur and that's about it. Since over 10 years now Windows has included the GDI+ subsystem, which is more or less, an object-oriented, improved version of GDI. GDI+ can load these other images without a problem - loading anything that Windows will display natively - including png, jpg, emf, wmf and a bunch of others.

Doing so is rather trivial - See below for an example of use. Make sure you link against the Gdiplus library. Also note, you just need to startup/shutdown Gdi+ once per program, which makes my example essentially a 1 line program that uses gdi+.

#include <gdiplus.h>

using namespace Gdiplus;

// BMP, GIF, JPEG, PNG, TIFF, Exif, WMF, and EMF
HBITMAP mLoadImageFile(wchar_t *filename)
{
    HBITMAP result = NULL;
    Bitmap bitmap(filename, false);
    bitmap.GetHBITMAP(0, &result);
    return result;
}

int main()
{
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR           gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    HBITMAP mBkgImg = mLoadImage(L"forrest.jpg");

   	GdiplusShutdown(gdiplusToken);

}

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