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Enable console redirection on Windows without starting from a console (#2888)

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This commit is contained in:
Segev Finer 2022-02-05 08:51:36 +02:00 committed by GitHub
parent 97b3aaaa3f
commit 84d4a64f47
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 8 deletions
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12
src/Main.cpp
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@ -12,15 +12,11 @@
/**
* @brief Attempt to connect to a parent console and configure outputs.
*
* @note Doesn't do anything if the exe wasn't executed from a console.
*/
#ifdef Q_OS_WIN
static void connectToConsole()
{
if (!AttachConsole(ATTACH_PARENT_PROCESS)) {
return;
}
BOOL attached = AttachConsole(ATTACH_PARENT_PROCESS);
// Avoid reconfiguring stdin/stderr/stdout if one of them is already connected to a stream.
// This can happen when running with stdout/stderr redirected to a file.
@ -32,12 +28,12 @@ static void connectToConsole()
// _open() after startup.
_close(0);
freopen("CONIN$", "r+", stdin);
freopen(attached ? "CONIN$" : "NUL", "r+", stdin);
}
if (0 > fileno(stdout)) {
_close(1);
if (freopen("CONOUT$", "a+", stdout)) {
if (freopen(attached ? "CONOUT$" : "NUL", "a+", stdout)) {
// Avoid buffering stdout/stderr since IOLBF is replaced by IOFBF in Win32.
setvbuf(stdout, nullptr, _IONBF, 0);
}
@ -45,7 +41,7 @@ static void connectToConsole()
if (0 > fileno(stderr)) {
_close(2);
if (freopen("CONOUT$", "a+", stderr)) {
if (freopen(attached ? "CONOUT$" : "NUL", "a+", stderr)) {
setvbuf(stderr, nullptr, _IONBF, 0);
}
}