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74 lines
2.5 KiB
Markdown
74 lines
2.5 KiB
Markdown
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## File Open API
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The `pfd::save_file` class handles file saving 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::save_file::save_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::force_overwrite` to disable a potential warning when
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saving to an existing file.
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The selected file is queried using `pfd::save_file::result()`. If the user canceled the
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operation, the returned file name is empty:
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```cpp
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std::string pfd::save_file::result();
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```
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It is possible to ask the file save 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::save_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::save_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 destination = pfd::save_file("Select a file").result();
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if (!destination.empty())
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std::cout << "User selected file " << destination << "\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 destination = pfd::save_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::force_overwrite).result();
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// Do something with destination
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std::cout << "Selected file: " << destination << "\n";
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```
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## Example 3: asynchronous file save
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Using `pfd::save_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 save dialog
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auto dialog = pfd::save_file("Select file to save");
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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 << "User selected file: " << dialog.result() << "\n";
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```
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