macos

问题 So bear with me as I am very new to coding. I'm trying to compile a Fortran file but I keep getting this issue in my terminal. I am using GNU Fortran (GCC) 9.2.0 and I believe I have all other prerequisites updated Xcode and atom. Appreciate any and all help spent went way too long just to say hello world. % gfortran -o myprog hello.f90 ld: library not found for -lSystem collect2: error: ld returned 1 exit status 来源： https://stackoverflow.com/questions/63032579/compiling-using-gfortran-in-mac

问题 I'm trying to adapt Apple's AVCamFilter sample to MacOS. The filtering appears to work, but rendering the processed image through Metal gives me a framerate of several seconds per frame. I've tried different approaches, but have been stuck for a long time. This is the project AVCamFilterMacOS - Can anyone with better knowledge of AVFoundation with Metal tell me what's wrong? I've been reading the documentation and practicing getting the unprocessed image to display, as well as rendering other

问题 I'm trying to adapt Apple's AVCamFilter sample to MacOS. The filtering appears to work, but rendering the processed image through Metal gives me a framerate of several seconds per frame. I've tried different approaches, but have been stuck for a long time. This is the project AVCamFilterMacOS - Can anyone with better knowledge of AVFoundation with Metal tell me what's wrong? I've been reading the documentation and practicing getting the unprocessed image to display, as well as rendering other

问题 I'm using mac os mojave, install python 2.7 and install pip using python get-pip.py , I already try those command to install pip : pip install --upgrade pip pip install nltk and try sudo python -m pip install --upgrade nltk But also result to same error like in this image Or here in text: error in nltk setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Expected version spec in singledispatch; python_version < "3.4" at

问题 I wanted to get an image of the screen, ignoring my app's window. Found a code example in Objective-C and tried to convert it to Swift. Objective-C snipped: // Get onscreen windows CGWindowID windowIDToExcude = (CGWindowID)[myNSWindow windowNumber]; CFArrayRef onScreenWindows = CGWindowListCreate(kCGWindowListOptionOnScreenOnly, kCGNullWindowID); CFMutableArrayRef finalList = CFArrayCreateMutableCopy(NULL, 0, onScreenWindows); for (long i = CFArrayGetCount(finalList) - 1; i >= 0; i--) {

问题 I wanted to get an image of the screen, ignoring my app's window. Found a code example in Objective-C and tried to convert it to Swift. Objective-C snipped: // Get onscreen windows CGWindowID windowIDToExcude = (CGWindowID)[myNSWindow windowNumber]; CFArrayRef onScreenWindows = CGWindowListCreate(kCGWindowListOptionOnScreenOnly, kCGNullWindowID); CFMutableArrayRef finalList = CFArrayCreateMutableCopy(NULL, 0, onScreenWindows); for (long i = CFArrayGetCount(finalList) - 1; i >= 0; i--) {

问题 I wanted to get an image of the screen, ignoring my app's window. Found a code example in Objective-C and tried to convert it to Swift. Objective-C snipped: // Get onscreen windows CGWindowID windowIDToExcude = (CGWindowID)[myNSWindow windowNumber]; CFArrayRef onScreenWindows = CGWindowListCreate(kCGWindowListOptionOnScreenOnly, kCGNullWindowID); CFMutableArrayRef finalList = CFArrayCreateMutableCopy(NULL, 0, onScreenWindows); for (long i = CFArrayGetCount(finalList) - 1; i >= 0; i--) {

问题 I'm trying to use opencv 4 in QT creator, I'm working on Mac but I can't be able to link the library, I always have a error like on picture 2. please help me, I'm really hopeless. 回答1: First of all be sure you installed OpenCV correctly and working fine. You can check OpenCV exist or not by: pkg-config --modversion opencv It depends how you installed OpenCV but linking OpenCV libraries and flags to Qt is simply like adding these two line to your .pro file: INCLUDEPATH += /usr/local/include

问题 How do I make zsh on a mac use python 2.7.6 which I have in my /usr/local/bin/python instead of python 2.7.5 which is in /usr/bin/python? (without needing to type /usr/local/bin/python before the script I want to run). My path setting on .zprofile is: # Setting PATH for Python 2.7 # The orginal version is saved in .zprofile.pysave PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}" export PATH 回答1: Set: export PATH="/usr/local/bin:$PATH" in your ~/.zshrc file. 来源： https:/

问题 In bash, if I run (foo=14) And then try to reference that variable later on in my bash script: echo "${foo}" I don't get anything. How can I make bash store this variable the way I need it to? Specifically, I am using this in an if statement and checking the exit code, something kind of like: if (bar="$(foo=14;echo "${foo}"|tr '1' 'a' 2>&1)") then echo "Setting "'$bar'" was a success. It is ${bar}" else echo "Setting "'$bar'" failed with a nonzero exit code." fi 回答1: Commands enclosed in