Curl on kenji.blog

[For Beginners] Steps to Install libcurl (with OpenSSL support) in Visual Studio using vcpkg

Mon, 07 Jul 2025 21:46:08 +0900

For using libcurl (with OpenSSL support) in Visual Studio, vcpkg is easy and recommended

When you want to handle HTTP communication in C++, libcurl is often used. However, adjusting builds and dependencies can be unexpectedly troublesome, right?

In such cases, the Microsoft-made C++ library management tool “vcpkg” is very useful. This time, we will introduce the steps from introducing libcurl (with OpenSSL support) using vcpkg to making it smooth to use in Visual Studio.

Installing vcpkg (Only for those who haven’t installed it yet)

First, let’s install vcpkg. Please run the following steps in PowerShell.

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git clone https://github.com/microsoft/vcpkg
cd vcpkg
.\bootstrap-vcpkg.bat

If Git is not installed yet, please install it from the Git official website.

Installing libcurl (with OpenSSL support)

Next, we will use vcpkg to install libcurl. To specify the 64bit version with OpenSSL support, run the following command.

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vcpkg install curl[ssl] --triplet x64-windows

When this command is run, necessary dependencies (such as OpenSSL) are also set up automatically.

Integration settings with Visual Studio

To easily use the library introduced by vcpkg from a Visual Studio project, configure the integration setting with the following command.

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vcpkg integrate install

By doing this setting, #include <curl/curl.h> can be automatically used in Visual Studio projects, eliminating the need to manually set up library paths and linker settings.

Conclusion

With this, the preparation to introduce libcurl (with OpenSSL support) into Visual Studio is complete.

With vcpkg, troublesome dependencies can be managed all at once.
Easily introduce libcurl with vcpkg install curl[ssl] --triplet x64-windows
Automatic integration with Visual Studio is possible with vcpkg integrate install

After this, just include the header in your project and start developing using the libcurl API. Please utilize the convenient vcpkg and dramatically increase your development efficiency.

Send Gmail from curl

Thu, 27 Feb 2025 02:13:31 +0900

Send Gmail from curl

1. Get an App Password

https://myaccount.google.com/apppasswords Click the link above and enter an app name. Save the generated password.

2. Send an email with the curl command

Run the following command.

In the example below, the email content is written in mail.txt.

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From: from@gmail.com
To: to@gmail.com
Subject: Test Email
Content-Type: text/plain; charset="UTF-8"

This is a test email.

Create the above file and run the following command.

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curl --url "smtps://smtp.gmail.com:465" --ssl-reqd --mail-from "from@gmail.com" --mail-rcpt "to@gmail.com" --user "from@gmail.com:xxxxxxxxxxxxxxxx" --upload-file mail.txt

Replace xxxxxxxxxxxxxxxx with your app password.

Generate QR code with curl

Tue, 16 Apr 2024 00:42:27 +0900

Generate QR code with curl

Note: The method introduced below generates the QR code on the server side and returns it, so logs might be kept. Please be careful when converting confidential information such as personal information into a QR code.

Method 1

This is a method to generate a QR code in the command prompt. qrenco.de returns a text-based response.

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curl qrenco.de/kenji.blog

Output result

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█████████████████████████████
█████████████████████████████
████ ▄▄▄▄▄ █ ▄ ▄ █ ▄▄▄▄▄ ████
████ █ █ █ ▀▀▀██ █ █ ████
████ █▄▄▄█ █▀▀█▀▄█ █▄▄▄█ ████
████▄▄▄▄▄▄▄█▄▀ ▀ █▄▄▄▄▄▄▄████
████▄ █▀▄ ▄▀█▄▀ ▀██▄▀ ▄████
████▀▀▀█ ▄▄ ▄█▄█▀█▀▄██ ▀████
████▄▄▄██▄▄█ █▀█ ▄██▀▀█ █████
████ ▄▄▄▄▄ █▀█ ▀ ▄▀▄▄▄ ▀████
████ █ █ █▄▄ ▄▀▄▀▄ ██ ▀████
████ █▄▄▄█ █▀▀█ ▀▄▄▄ ▄▄██████
████▄▄▄▄▄▄▄█▄▄███▄▄█▄███▄████
█████████████████████████████
█████████████████████████████

Reference

qrenco.de

Method 2

api.qrserver.com returns an image.

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curl -o qr.png "https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=HelloWorld"

Output result

Reference

QR Code Generator