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i want to try to add raster layers(.tif) in QGIS using pyqgis first in python console first and after in the new QGIS plugin but i am very confused with that and specific to add tif rasters layers. i use QGIS 2.6.1 (and i test all in QGIS 2.18.3 but i need 2.6.1 version) and python 2.7.13 in windows 10 or 7.

first i try this code from this post:

from qgis.core import QgsRasterLayer
from PyQt4.QtCore import QFileInfo
def StringToRaster(raster):
    fileInfo = QFileInfo(raster)
    path = fileInfo.filePath()
    baseName = fileInfo.baseName()
    layer = QgsRasterLayer(path, baseName)
    QgsMapLayerRegistry.instance().addMapLayer(layer)
    if layer.isValid() is True:
        print "Layer was loaded successfully!"
    else:
        print "Unable to read basename and file path - Your string is probably invalid"
raster = '/path/to/raster/file.tif'
StringToRaster(raster)

that not working for me with all rasters ".tif,.jpg,.png"

error :

Unable to read basename and file path - Your string is probably invalid

if i try this from official QGIS tutorial post:

fileName = "/path/to/raster/file.tif"
fileInfo = QFileInfo(fileName)
baseName = fileInfo.baseName()
rlayer = QgsRasterLayer(fileName, baseName)
if not rlayer.isValid():
  print "Layer failed to load!"

that working only with ".jpg" and ".png" but not for ".tif" rasters layers

error :

"Layer failed to load!"

and finaly i test this :

iface.addRasterLayer("/path/to/raster/file.tif", "layer name you like")

and i take that error message if i want to add .tif raster(other raster i can add with this method):

Cannot open GDAL dataset 
`/path/to/raster/file.tif': does not exist in the file system,
and is not recognised as a supported dataset name.

and finaly i test this code from this post

import osgeo.gdal
from  gdalconst import *
from PyQt4.QtCore import QFileInfo,QSettings
from qgis.core import QgsRasterLayer, QgsCoordinateReferenceSystem

file = QFileDialog.getOpenFileName(self, 
    "Open TIF Image", ".", "Tagged image (*.tif)")
fileInfo = QFileInfo(file)    
fileName=fileInfo.fileName()
baseName = fileInfo.baseName()

layer = QgsRasterLayer(file, baseName)

error :

no module name  gdalconst

that is the bug or QGIS or i do something wrong ?

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Chris Papas
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  • I'm quite sure there is some problem with your filepath: is there any blank space or special character in it? I tested your first code and it works for me. – mgri Mar 17 '17 at 20:03
  • In your last code snippet there is no need to import gdalconst. Comment out this line and try again. Unusual characters in file path may be a reason. Sometimes tif files have the extension tiff – Detlev Mar 17 '17 at 20:52
  • i have test with the different images and paths wit all extension but no change..@mgri who is your QGIS version ? – Chris Papas Mar 17 '17 at 21:40
  • and the last code addition error is NameError: name'QFileDialog' is not defined – Chris Papas Mar 17 '17 at 21:46
  • @ChrisPapas - You could use from PyQt4.QtGui import QFileDialog which should remove the name error. – Joseph Mar 20 '17 at 10:07

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