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90 lines
3.2 KiB
Markdown
90 lines
3.2 KiB
Markdown
## File Open API
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The `pfd::open_file` class handles file opening dialogs. It can be provided a title, a starting
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directory and/or pre-selected file, an optional filter for recognised file types, and an optional
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flag to allow multiple selection:
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```cpp
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pfd::open_file::open_file(std::string const &title,
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std::string const &initial_path,
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std::vector<std::string> filters = { "All Files", "*" },
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pfd::opt option = pfd::opt::none);
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```
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The `option` parameter can be `pfd::opt::multiselect` to allow selecting multiple files.
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The selected files are queried using `pfd::open_file::result()`. If the user canceled the
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operation, the returned list is empty:
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```cpp
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std::vector<std::string> pfd::open_file::result();
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```
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It is possible to ask the file open dialog whether the user took action using the
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`pfd::message::ready()` method, with an optional `timeout` argument. If the user did not validate
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the dialog within `timeout` milliseconds, the function will return `false`:
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```cpp
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bool pfd::open_file::ready(int timeout = pfd::default_wait_timeout);
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```
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## Example 1: simple file selection
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Using `pfd::open_file::result()` will wait for user action before returning. This operation will
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block and return the user choice:
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```cpp
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auto selection = pfd::open_file("Select a file").result();
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if (!selection.empty())
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std::cout << "User selected file " << selection[0] << "\n";
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```
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## Example 2: filters
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The filter list enumerates filter names and corresponded space-separated wildcard lists. It
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defaults to `{ "All Files", "*" }`, but here is how to use other options:
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```cpp
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auto selection = pfd::open_file("Select a file", ".",
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{ "Image Files", "*.png *.jpg *.jpeg *.bmp",
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"Audio Files", "*.wav *.mp3",
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"All Files", "*" },
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pfd::opt::multiselect).result();
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// Do something with selection
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for (auto const &filename : dialog.result())
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std::cout << "Selected file: " << filename << "\n";
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```
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## Example 3: asynchronous file open
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Using `pfd::open_file::ready()` allows the application to perform other tasks while waiting for
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user input:
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```cpp
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// File open dialog
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auto dialog = pfd::open_file("Select file to open");
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// Do something while waiting for user input
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while (!dialog.ready(1000))
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std::cout << "Waited 1 second for user input...\n";
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// Act depending on the user choice
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std::cout << "Number of selected files: " << dialog.result().size() << "\n";
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```
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## Screenshots
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Windows 10:
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Mac OS X (dark theme):
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Mac OS X (light theme):
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Linux (GNOME desktop):
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Linux (KDE desktop):
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