Hi,
I'm writing a GTK+ application with MINGW-W64, which spawns a subprocess running bash
to execute some commands with GSubprocess and reads stdout of bash (installed from MSYS2). I
found that if compiled without "-mwindows" compilation option the main
process can read the stdout, while with "-mwindows", the read function
always returns 0 bytes read. If the main process runs a normal console
program, or like "mingw32/bin/gcc.exe", then it can read stdout even if
compiled with "-mwindows".
The code:
#include <glib.h> #include <gio/gio.h> #include <gtk/gtk.h> #include <stdio.h> char buffer[100]; GtkTextView *text; void ondataread(GObject *s, GAsyncResult *r, gpointer p) { GError *error = NULL; int l = g_input_stream_read_finish(G_INPUT_STREAM(s), r, &error); if (error) printf("read error: %s\n", error->message); else if (l > 0) { gtk_text_buffer_insert_at_cursor(gtk_text_view_get_buffer(text), buffer, l); g_input_stream_read_async(G_INPUT_STREAM(s), buffer, 100, G_PRIORITY_DEFAULT, NULL, ondataread, NULL); } } int main(int argc, char **argv) { char *subpargv[8] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; subpargv[0] = "D:\\msys64\\usr\\bin\\bash.exe"; subpargv[1] = "-c"; subpargv[2] = "echo good; sleep 10; pwd"; // subpargv[0] = "C:\\Windows\\system32\\cmd.exe"; // subpargv[1] = "/c"; // subpargv[2] = "echo good"; // subpargv[0] = "D:\\msys64\\mingw32\\bin\\gcc.exe"; // subpargv[1] = "notfile"; GSubprocessLauncher *l = g_subprocess_launcher_new(G_SUBPROCESS_FLAGS_STDOUT_PIPE | G_SUBPROCESS_FLAGS_STDERR_PIPE); GError *error = NULL; GSubprocess *p = g_subprocess_launcher_spawnv(l, subpargv, &error); if (!p) { printf("spawn error: %s\n", error->message); return -1; } g_object_unref(l); g_input_stream_read_async(g_subprocess_get_stdout_pipe(p), buffer, 100, G_PRIORITY_DEFAULT, NULL, ondataread, NULL); g_input_stream_read_async(g_subprocess_get_stderr_pipe(p), buffer, 100, G_PRIORITY_DEFAULT, NULL, ondataread, NULL); gtk_init(&argc, &argv); GtkWidget *win = gtk_window_new(GTK_WINDOW_TOPLEVEL); GtkWidget *t = gtk_text_view_new(); gtk_container_add(GTK_CONTAINER(win), t); text = GTK_TEXT_VIEW(t); gtk_widget_show_all(win); gtk_main(); return 0; }
How to read stdout correctly?
Thanks,
Gang
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