更改按钮PNG图像 [英] Change Button PNG Image

问题描述

在此学习体验上进展缓慢！
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点击时，我现在无法更改按钮PNG图像。



我在inputButton类中有这个函数：

Progressing slowly on this learning experience!

I'm now stuck at changing the buttons PNG image when it's clicked.

I have this function in the inputButton class:

void toggleButton(HWND buttonHandle, int buttonId, int buttonState) {

		switch (buttonState) {
			case 0: { 
				this->setButtonState(1);
				buttonState = 1;		

				Gdiplus::Bitmap* m_pBitmap;
				HICON hicon;
				m_pBitmap = Gdiplus::Bitmap::FromFile(L"greenSwitch.png");
				m_pBitmap->GetHICON(&hicon);

				LRESULT lr = SendMessage(buttonHandle, BM_SETIMAGE, IMAGE_ICON, (LPARAM)hicon);

				ShowWindow(buttonHandle, 1);
				UpdateWindow(buttonHandle);
			}
			break;
		}

	};

但图片不会改变...



我有一种感觉我不能在这里改变它，它必须在WM_DRAWITEM或WM_PAINT回调中完成。这是正确的吗？

But the image doesn't change...

I have a feeling I can't change it here and it has to be done in the WM_DRAWITEM or WM_PAINT callbacks. Is that correct?

推荐答案

您的按钮是否设置了BS_ICON或BS_BITMAP样式？

Does your button have the BS_ICON or BS_BITMAP style set?

您是否检查了代码以确保hicon包含HICON？

Did you check the code to make sure the hicon contains an HICON?

这篇关于更改按钮PNG图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！