如何在GUI中加载位图(VS 2010) [英] how to load bitmap in GUI (VS 2010)

问题描述

如何正确加载位图?

这是我的按钮，我正在编辑控件中输入文件名，并读取它:

how to load bitmap correctly?

it''s my button, i''m typing file name in edit control, reading it:

case button:
    {
        buffer.resize(GetWindowTextLength(GetDlgItem(hWnd,text_edit))+1);

        GetWindowText(GetDlgItem(hWnd,text_edit),&buffer[0],buffer.size()+1);

        for(int i=0;i<buffer.size();i++)
            img_name+=buffer[i];

        WndProc(hWnd,WM_PAINT,NULL,NULL);

    }
    break;

然后尝试加载bmp文件(263 * 289)并绘制它，但是它不起作用

then trying to load bmp file(263*289) and draw it, but it doesn''t work

case WM_PAINT:
		{

			hdc = BeginPaint(hWnd, &ps);

			HDC tdc =CreateCompatibleDC(hdc);

						
HBITMAP bitmap=(HBITMAP)LoadImage(NULL,img_name,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);


			HBITMAP old = (HBITMAP) SelectObject(tdc,bitmap);

			BitBlt(hdc,0,0,263,289,tdc,0,0,SRCCOPY);

			SelectObject(tdc,old);

			DeleteObject(bitmap);

			DeleteDC(tdc);

			EndPaint(hWnd, &ps);

		}
		break;

推荐答案

您没有解释您的问题，说没有".工作"并没有太大帮助.所以我在这里写的都是猜测.

我不确定以下几行应该做什么

You did not explain your problem, saying "it doesn''t work" is not much help. So anything I write here is guesswork.

I''m not sure what the following lines are supposed to do

for(int i=0;i<buffer.size();i++)>
    img_name+=buffer[i];

您确定他们产生了预期的结果吗?

这是错误的:

are you sure they produced the desired result?

This is wrong:

WndProc(hWnd,WM_PAINT,NULL,NULL);

如果您希望表示对窗口内容的更新，则应致电 [^ ].

if you wish to signal an update to the window''s content you should call InvalidateRect[^].

这篇关于如何在GUI中加载位图(VS 2010)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！