轻松实现图片按钮

使用下面的函数，可实现将指定文件缩放后显示到按钮上。

前提是先将图片按钮的Bitmap属性设置为True。

#include <atlimage.h>
void CtestAppDlg::DrawPictureOnButton(CWnd *pBtn, const CString &sFilePath)
{
    CBitmapButton *pBmpBtn = (CBitmapButton *)pBtn;
    CImage img;
    img.Load(sFilePath);
    HBITMAP bitmap = img.Detach();
    RECT rc;
    pBmpBtn->GetWindowRect(&rc);
    bitmap = (HBITMAP)CopyImage(
            bitmap,
            IMAGE_BITMAP, 
            rc.right - rc.left, 
            rc.bottom - rc.top, 
            0);
    pBmpBtn->SetBitmap(bitmap);
    pBmpBtn->SetButtonStyle(BS_BITMAP, FALSE);
}

调用时的代码为：

DrawPictureOnButton(GetDlgItem(IDC_BUTTON1), _T("C:\\picture\\10.bmp"));
DrawPictureOnButton(GetDlgItem(IDC_BUTTON2), _T("C:\\picture\\9.jpg"));
DrawPictureOnButton(GetDlgItem(IDC_BUTTON3), _T("C:\\picture\\head.gif"));
DrawPictureOnButton(GetDlgItem(IDC_BUTTON4), _T("C:\\picture\\2.PNG"));
DrawPictureOnButton(GetDlgItem(IDC_BUTTON5), _T("C:\\picture\\1.tif"));