Is vcpkg required if I installed from Chocolaty

[hyousefGopher]

At Window10, I installed opencv and llvm using chocolaty, trying to run simple example:

use opencv::{
    core,
    highgui,
    prelude::*,
    videoio,
};

fn run() -> opencv::Result<()> {
    let window = "video capture";
    highgui::named_window(window, 1)?;
    #[cfg(feature = "opencv-32")]
    let mut cam = videoio::VideoCapture::new_default(0)?;  // 0 is the default camera
    #[cfg(not(feature = "opencv-32"))]
    let mut cam = videoio::VideoCapture::new(0, videoio::CAP_ANY)?;  // 0 is the default camera
    let opened = videoio::VideoCapture::is_opened(&cam)?;
    if !opened {
        panic!("Unable to open default camera!");
    }
    loop {
        let mut frame = core::Mat::default()?;
        cam.read(&mut frame)?;
        if frame.size()?.width > 0 {
            highgui::imshow(window, &mut frame)?;
        }
        let key = highgui::wait_key(10)?;
        if key > 0 && key != 255 {
            break;
        }
    }
    Ok(())
}

fn main() {
    run().unwrap()
}

With Toml as:

opencv = "0.34"

But I got the below error:

D:\rust_webview>cargo run
Compiling webview-sys v0.5.0
Compiling tinyfiledialogs v3.3.9
Compiling opencv v0.34.0
error: failed to run custom build command for opencv v0.34.0

Caused by:
process didn't exit successfully: D:\rust_webview\target\debug\build\opencv-0980f6e1ac4b8856\build-script-build (exit code: 1)
--- stderr
=== Environment configuration:
=== OPENCV_HEADER_DIR = None
=== OPENCV_PACKAGE_NAME = None
=== OPENCV_PKGCONFIG_NAME = None
=== OPENCV_LINK_LIBS = None
=== OPENCV_LINK_PATHS = Some("C:\tools\opencv\build\x64\vc14\lib")
=== OPENCV_INCLUDE_PATHS = Some("C:\tools\opencv\build\include")
=== PKG_CONFIG_PATH = None
=== VCPKG_ROOT = None
=== Setting up OpenCV library from vcpkg
Error: "Package opencv4 is not found, caused by: Could not find Vcpkg tree: No vcpkg.user.targets found. Set the VCPKG_ROOT environment variable or run 'vcpkg integrate install'"

warning: build failed, waiting for other jobs to finish...
error: build failed

[twistedfall]

Please also set OPENCV_LINK_LIBS to "opencv_world412" (adjust for your opencv version), without all three (OPENCV_LINK_LIBS, OPENCV_LINK_PATHS, OPENCV_INCLUDE_PATHS) the crate doesn't have enough info to find opencv and tries to rely on external tools.

[hyousefGopher]

I've this setup already, even once I changed it to "opencv_world412" still getting the same msg:

[twistedfall]

Well, the build log says:

OPENCV_LINK_LIBS = None

so something is not right. Here another Windows user is mentioning the need to restart so you can maybe try that.

[twistedfall]

Did you have any luck?

[hyousefGopher]

Just rebooted by device, and got the below:

[twistedfall]

I suggest you check the whole thread in #113, that error was also mentioned there (and solved).

[hyousefGopher]

I copied all the .dll files and got below error, actually I could not find anywhere n my PC a file named opencv_world:

I just downloaded it from here but not sure where shall I put it

[twistedfall]

I believe that when you install OpenCV from vcpkg you get different modules in separate files, so you should have opencv_core, opencv_imgproc and do on. But generally can you please post the full output of the following command:

cargo clean
cargo build -vv

[hyousefGopher]

mm, before the full log, actuall I installed opencv in multiple way, from python, from GoCV 'faileda from chocolaty and vcpkg, trying to do cleaning to avoid conflicting issues, anyhow, here is the full log as it is very long:

https://gist.github.com/hyousef-rusty/7e41a48c35754b70696081f62887250a

[twistedfall]

As far as I can see there is a version mismatch between what you have in headers and library file name:

[opencv 0.34.0]     version: "4.1.2",
...
[opencv 0.34.0]         "cargo:rustc-link-lib=opencv_world420",

So I believe you installed version 4.1.2 so you'd need to link to opencv_world412 (the value of OPENCV_LINK_LIBS env var). You should have this file (both lib and dll) in your C:\\tools\\opencv\\build\\x64\\vc14\\lib directory, do not download it from anywhere.

[hyousefGopher]

Oooof, finally got it, I removed everything I've though I'm not sure if really required, but wanted to do as fresh install.

1. Install Chocolatey

2. Installed OpenCV and LLVM as choco install llvm opencv

3. Add the below Environmental variables:
   

4. Restarted the PC for Env changes to take place

5. Built the Cargo.toml as"

[dependencies]
opencv = {version = "0.34", features = ["buildtime-bindgen"]}

6. Built the src/main.rs as:

use opencv::{
    core,
    highgui,
    prelude::*,
    videoio,
};

fn run() -> opencv::Result<()> {
    let window = "video capture";
    highgui::named_window(window, 1)?;
    #[cfg(feature = "opencv-32")]
    let mut cam = videoio::VideoCapture::new_default(0)?;  // 0 is the default camera
    #[cfg(not(feature = "opencv-32"))]
    let mut cam = videoio::VideoCapture::new(0, videoio::CAP_ANY)?;  // 0 is the default camera
    let opened = videoio::VideoCapture::is_opened(&cam)?;
    if !opened {
        panic!("Unable to open default camera!");
    }
    loop {
        let mut frame = core::Mat::default()?;
        cam.read(&mut frame)?;
        if frame.size()?.width > 0 {
            highgui::imshow(window, &mut frame)?;
        }
        let key = highgui::wait_key(10)?;
        if key > 0 && key != 255 {
            break;
        }
    }
    Ok(())
}

fn main() {
    run().unwrap()
}

7. Build executable as: cargo build
8. Add the opencv_worldxxx.dll to the same location of the .exe file

9. Run the executable as cargo run:
   

[twistedfall]

I’m glad it worked!