QPixmap常用方法：
QPixmap(const QString & fileName, const char * format = 0, Qt::ImageConversionFlags flags = Qt::AutoColor)
QBitmap mask() const
bool save(const QString & fileName, const char * format = 0, int quality = -1) const
bool save(QIODevice * device, const char * format = 0, int quality = -1) const
QPixmap scaled(const QSize & size, Qt::AspectRatioMode aspectRatioMode = Qt::IgnoreAspectRatio, Qt::TransformationMode transformMode = Qt::FastTransformation) const
QPixmap scaled(int width, int height, Qt::AspectRatioMode aspectRatioMode = Qt::IgnoreAspectRatio, Qt::TransformationMode transformMode = Qt::FastTransformation) const
void setMask(const QBitmap & mask)
QImage toImage() const
静态函数
QPixmap fromImage(const QImage & image, Qt::ImageConversionFlags flags = Qt::AutoColor)
QPixmap fromImage(QImage && image, Qt::ImageConversionFlags flags = Qt::AutoColor)
废弃函数
The following members of class QPixmap are obsolete. They are provided to keep old source code working. We strongly advise against using them in new code.
Public Functions
(obsolete) void fill(const QPaintDevice * device, const QPoint & p)
(obsolete) void fill(const QPaintDevice * device, int x, int y)
(obsolete) int serialNumber() constStatic Public Members
(obsolete) QPixmap grabWidget(QObject * widget, const QRect & rectangle)
(obsolete) QPixmap grabWidget(QObject * widget, int x = 0, int y = 0, int w = -1, int h = -1)
(obsolete) QPixmap grabWindow(WId window, int x = 0, int y = 0, int width = -1, int height = -1)
1 //方法一：qt自带
2 int x = QCursor::pos().x();
3 int y = QCursor::pos().y();
4 QString text = QString("pos: %1, %2\n").arg(x).arg(y);
5
6 QPixmap pixmap = QPixmap::grabWindow(QApplication::desktop()->winId(), x, y, 1, 1);
7 if (!pixmap.isNull())
8 {
9 QImage image = pixmap.toImage();
10 if (!image.isNull())
11 {
12 if (image.valid(0, 0))
13 {
14 QColor color = image.pixel(0, 0);
15 text += QString("RGB: %1, %2, %3").arg(color.red()).arg(color.green()).arg(color.blue());
16 }
17 }
18 }
19
20 //方法二：windows系统api
21 POINT pt;
22 GetCursorPos(&pt);
23 HDC hDC = GetDC(NULL);
24 COLORREF color = GetPixel(hDC, pt.x, pt.y);
25 ReleaseDC(NULL, hDC);
26 BYTE r = GetRValue(color);
27 BYTE g = GetGValue(color);
28 BYTE b = GetBValue(color);
