Ghost Cell Pattern in MPI

HPC

Concept Ghost cells refer to additional boundary cells that are replicated or exchanged between neighboring computational domains or processors. Data Exchange Using MPI_Isend and MPI_Irecv synchr...

Posted by UG on February 1, 2024

Calling An Executable Within C++

QTextDocument

Describe A simple example of calling this exe in C++. Effect Tried to find the DPI of a JPG in Qt, but have trouble getting the right DPI value by using QImage. The same problem as mentioned in t...

Posted by UG on March 1, 2023

Seperate Characters In a Qt Text

QTextDocument

Describe Implement a function that can seperate a Qt text from one document(entity) into multiple documents(entities), with the key focus being on determining the distance between adjacent characte...

Posted by UG on January 28, 2023

The Precision Loss of Double-to-Float Conversion

Incorrect display

Problem The graph below illustrates the difference in the display scene beteewn our application and AutoCAD. We can see the point-value issue here. Debugging This curve are composed of B-splines,...

Posted by UG on January 22, 2023

DXF File Format:UTF-8 and GBK

Encoding format

Problem When importing a DXF file, chinese characters may appear as messy codes and the distance between them is incorrect. (Note: This latter issue will not be addressed in this context.) The co...

Posted by UG on January 17, 2023

Read and Write Time Optimization

Faster type conversion

Describe Extract date from a DXF file and write it to a txt file. Test File A DXF file has 1422390 lines and a size of 10.5M. Result Replication Times: 100 Average run time before optimization: 1...

Posted by UG on January 16, 2023

Non-breaking Space and Normal Space

QString, std::wstring and std::string

Problem There is a file A B.dxf that is failing to import in our application. Debugging Upon further investigation, I found the space between A and B is a non-breaking space (char 160) in the QStr...

Posted by UG on January 15, 2023

FEATURED TAGS
C++ Qt Issue
ABOUT ME

✉️ You-Yi.Zhang@outlook.com