error-handling

问题 Each stream has "an error indicator that records whether a read/write error has occurred". It is set, usually rarely, by various functions: fgetc(), fflush(), fseek(), ... . It is cleared by various functions: rewind(), clearerr(), fopen(), ... . int ferror(FILE *stream) reports the state. The ferror function returns nonzero if and only if the error indicator is set for stream . In this case, certainly an input error just occurred. if (!ferror(istream)) { int ch = fgetc(istream); if (ch ==

问题 I'm trying to understand how to use the question mark operator for error handling in Rust. I have this code: fn main() -> Result<(), &'static str> { let foo: i32 = Some("1") .ok_or(Err("error 1"))? .parse() .or(Err("error 2"))?; Ok(()) } This code can not be compiled for some reason: error[E0277]: the trait bound `&str: std::convert::From<std::result::Result<_, &str>>` is not satisfied --> src/main.rs:2:20 | 2 | let foo: i32 = Some("1") | ____________________^ 3 | | .ok_or(Err("error 1"))? |

问题 I'm trying to understand how to use the question mark operator for error handling in Rust. I have this code: fn main() -> Result<(), &'static str> { let foo: i32 = Some("1") .ok_or(Err("error 1"))? .parse() .or(Err("error 2"))?; Ok(()) } This code can not be compiled for some reason: error[E0277]: the trait bound `&str: std::convert::From<std::result::Result<_, &str>>` is not satisfied --> src/main.rs:2:20 | 2 | let foo: i32 = Some("1") | ____________________^ 3 | | .ok_or(Err("error 1"))? |

问题 I know this question has already been answered on this site, however, none of the solutions I looke up the internet seemed to work. Here's what I tried: Giving all permissions to my python file Changing PATH variable to point to my tesseract folder Running IDLE as administrator and then executing the file from there This error is quite bothering me now and I can't advance any further because of it. Here's my code if that's going to help: import pytesseract import sys import argparse try:

问题 I am trying to install aerospike-node client with npm on Ubuntu. npm install aerospike While installing I am getting ERROR like SOLINK_MODULE(target) Release/obj.target/aerospike.node /usr/bin/ld: cannot find -lz collect2: error: ld returned 1 exit status aerospike.target.mk:186: recipe for target 'Release/obj.target/aerospike.node' failed make: *** [Release/obj.target/aerospike.node] Error 1 rm binding_gyp_aerospike_client_c_target_run_scripts_aerospike_client_c_sh.intermediate make: Leaving

问题 I'm having trouble running a Friedman test over my data. I'm trying to run a Friedman test using this command: friedman.test(mean ~ isi | expId, data=monoSum) On the following database (https://www.dropbox.com/s/2ox0y1b4gwld0ai/monoSum.csv): > monoSum expId isi N mean 1 m80B1 1 10 100.000000 2 m80B1 2 10 73.999819 3 m80B1 3 10 45.219362 4 m80B1 4 10 116.566174 . . . . . 18 m80L2 2 10 82.945491 19 m80L2 3 10 57.675480 20 m80L2 4 10 207.169277 . . . . . . 25 m80M2 1 10 100.000000 26 m80M2 2 10

问题 I'm having trouble running a Friedman test over my data. I'm trying to run a Friedman test using this command: friedman.test(mean ~ isi | expId, data=monoSum) On the following database (https://www.dropbox.com/s/2ox0y1b4gwld0ai/monoSum.csv): > monoSum expId isi N mean 1 m80B1 1 10 100.000000 2 m80B1 2 10 73.999819 3 m80B1 3 10 45.219362 4 m80B1 4 10 116.566174 . . . . . 18 m80L2 2 10 82.945491 19 m80L2 3 10 57.675480 20 m80L2 4 10 207.169277 . . . . . . 25 m80M2 1 10 100.000000 26 m80M2 2 10

问题 I am having a table view with a huge amount of cells. I tried to tap a particular cell from this table view. But the test ending with this error: Failed to get snapshot within 15.0s I assume that, the system will take snapshot of the whole table view before accessing its element. Because of the huge number of cells, the snapshot taken time was not enough (15 secs is may be the system default time). I manually set the sleep time / wait time (I put 60 secs). Still I can not access the cells

问题 Is it possible to use an old version of the stats package in R? The function stats:::regularize.values causes me warnings and errors in the last R version (any version >3.5). I have no possibility to get back to an old R version. I have no clue where the regularize.values function is called in my code since I use several functions, some of them from different R packages. I've tried to change the call to regularize.values in my code by doing assignInNamespace("regularize.values", regularize

问题 I have the following code which converts Excel Sheets with a specific sheet names into PDF and then it loops in the folder. The User can input the sheet name into the tool for the code to loop for. However, if the sheet name is incorrect or does not exist, it shows Run-Time Error 9: Subscript out of Range. Instead of this error, I would like to get a MsgBox then Exit the Sub. I tried using On Error GoTo approach, which works when the code doesnt match the sheet name to the reference cell and