C# waitforexit child process

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Notify me of new comments via email. Notify me of new posts via email. Purpose You develop a Form application, which will start some console application maybe made by you too , or an Operating System OS command e. The result could contain various alphabets and you do not want to lose or distort any letter. Solution The usual way of executing an external application is based on System.

StartInfo; si. UTF8; process.

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This method enables a designated event handler for the stream output and immediately returns to the caller, which can perform other work while the stream output is directed to the event handler. Synchronous read operations introduce a dependency between the caller reading from the StandardOutput stream and the child process writing to that stream. These dependencies can result in deadlock conditions. When the caller reads from the redirected stream of a child process, it is dependent on the child. The caller waits on the read operation until the child writes to the stream or closes the stream.

When the child process writes enough data to fill its redirected stream, it is dependent on the parent. The child process waits on the next write operation until the parent reads from the full stream or closes the stream. The deadlock condition results when the caller and child process wait on each other to complete an operation, and neither can proceed.

You can avoid deadlocks by evaluating dependencies between the caller and child process. The following C code, for example, shows how to read from a redirected stream and wait for the child process to exit. The code example avoids a deadlock condition by calling p.

Definition

ReadToEnd before p. A deadlock condition can result if the parent process calls p. WaitForExit before p.


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ReadToEnd and the child process writes enough text to fill the redirected stream. The parent process would wait indefinitely for the child process to exit. The child process would wait indefinitely for the parent to read from the full StandardOutput stream.

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There is a similar issue when you read all text from both the standard output and standard error streams. The following C code, for example, performs a read operation on both streams. The code example avoids the deadlock condition by performing asynchronous read operations on the StandardOutput stream. A deadlock condition results if the parent process calls p.

Process.WaitForExit doesn't return even though Process.HasExited is true

If the associated process does not exit by the end of the interval because the request to terminate is denied, false is returned to the calling procedure. You can specify Timeout.


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Infinite for milliseconds , and Process. If you pass 0 zero to the method, it returns true only if the process has already exited; otherwise, it immediately returns false. When standard output has been redirected to asynchronous event handlers, it is possible that output processing will not have completed when this method returns. To ensure that asynchronous event handling has been completed, call the WaitForExit overload that takes no parameter after receiving a true from this overload.

To help ensure that the Exited event is handled correctly in Windows Forms applications, set the SynchronizingObject property. When an associated process exits is shut down by the operating system through a normal or abnormal termination , the system stores administrative information about the process and returns to the component that had called WaitForExit Int Skip to main content. Contents Exit focus mode. Diagnostics Assembly: System. Note In the.

Applies to. WaitForExit Int Is this page helpful? Yes No. Any additional feedback?

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