how to load bitmap in GUI (VS 2010)

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how to load bitmap correctly?

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

C#

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;

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

C#

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;

Posted 18-Dec-11 3:08am

positivcheg

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Richard MacCutchan · Answer 1 · 2011-12-18T05:03:00

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

C++

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

are you sure they produced the desired result?

This is wrong:

C++

WndProc(hWnd,WM_PAINT,NULL,NULL);

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