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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WaitForInputIdle
The WaitForInputIdle function waits until the given process is waiting for user input with no
input pending, or until the time-out interval has elapsed.
The WaitForInputIdle function only works with GUI applications. If a console application calls the
function, it returns immediately, with no wait.
DWORD WaitForInputIdle(
HANDLE hProcess,
| // handle to process
| DWORD dwMilliseconds
| // time-out interval in milliseconds
| );
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Parameters
hProcess
Identifies the process.
dwMilliseconds
Specifies the time-out interval, in milliseconds. If dwMilliseconds is INFINITE, the function does not return until the process is idle.
Return Values
The following table shows the possible return values:
Value
| Meaning
| 0
| The wait was satisfied successfully.
| WAIT_TIMEOUT
| The wait was terminated because the time-out interval elapsed.
| 0xFFFFFFFF
| An error occurred. To get extended error information, use the GetLastError function.
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Remarks
The WaitForInputIdle function enables a thread to suspend its execution until a specified process
has finished its initialization and is waiting for user input with no input
pending. This can be useful for synchronizing a parent process and a newly created
child process. When a parent process creates a child process, the CreateProcess function returns without waiting for the child process to finish its
initialization. Before trying to communicate with the child process, the parent process
can use WaitForInputIdle to determine when the child's initialization has been completed. For example,
the parent process should use WaitForInputIdle before trying to find a window associated with the child process.
The WaitForInputIdle function can be used at any time, not just during application startup.
See Also
CreateProcess
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