QT一般要用到文件選操作,以打開圖片爲例,以下爲部分代碼:
QImage openImage()
{
QString filename = QFileDialog::getOpenFileName(this,
tr("choose a pic"),
"",
tr("Images (*.png *.bmp *.jpg *.tif *.GIF *.jpeg)"));
if (filename.isEmpty())
{
return;
}
QImage image= QImage(filename);
return image;
//可用opencv作爲轉換
Mat imageread;
imageread = imread(filename.toLatin1().data(), 1);
return Mat2QImage(imageread);
}
QImage Mat2QImage(const cv::Mat& mat)
{
// 8-bits unsigned, NO. OF CHANNELS = 1
if (mat.type() == CV_8UC1)
{
QImage image(mat.cols, mat.rows, QImage::Format_Indexed8);
image.setColorCount(256);
for (int i = 0; i < 256; i++)
{
image.setColor(i, qRgb(i, i, i));
}
// Copy input Mat
uchar *pSrc = mat.data;
for (int row = 0; row < mat.rows; row++)
{
uchar *pDest = image.scanLine(row);
memcpy(pDest, pSrc, mat.cols);
pSrc += mat.step;
}
return image;
}
// 8-bits unsigned, NO. OF CHANNELS = 3
else if (mat.type() == CV_8UC3)
{
// Copy input Mat
const uchar *pSrc = (const uchar*)mat.data;
// Create QImage with same dimensions as input Mat
QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
return image.rgbSwapped();
}
else if (mat.type() == CV_8UC4)
{
qDebug() << "CV_8UC4";
// Copy input Mat
const uchar *pSrc = (const uchar*)mat.data;
// Create QImage with same dimensions as input Mat
QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);
return image.copy();
}
else
{
qDebug() << "ERROR: Mat could not be converted to QImage.";
return QImage();
}
}
對於分析文件名稱和路徑可以用已封裝好的函數。
QString file_full, file_name, file_path;
QFileInfo fi;
file_full = QFileDialog::getOpenFileName(this);
fi = QFileInfo(file_full);
file_name = fi.fileName();
file_path = fi.absolutePath();