Comments (3)
You need to call FlushFileBuffers(HStdOut)
after the last WriteConsole
.
See more technical details here: #38
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Tried that just now, but the NppExec console output still doesn't work. Other consoles work as usual.
I just put the FlushFileBuffers(HStdOut)
directly after WriteConsole(HStdOut, "Hello World", strlen("Hello World"), IndexStdOut, NULL)
.
Also, the issue that you have provided is similar, but not identical to the issue I have. Their program produces output on exit, while my program doesn't produce any output at all.
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When I compile this code into an executable:
#include <windows.h>
int APIENTRY WinMain(HINSTANCE hInst, HINSTANCE hInstPrev, PSTR cmdline, int cmdshow)
{
// Get command line arguments
char *args = GetCommandLine();
// Get output handle and other stuff
HANDLE HStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD dwCharsWritten = 0;
// Output 'hello world' string
if (HStdOut != NULL && HStdOut != INVALID_HANDLE_VALUE)
{
WriteConsole(HStdOut, args, strlen(args), &dwCharsWritten, NULL);
WriteConsole(HStdOut, "\n", 1, &dwCharsWritten, NULL);
WriteConsole(HStdOut, "Hello World", strlen("Hello World"), &dwCharsWritten, NULL);
FlushFileBuffers(HStdOut);
}
else
{
MessageBox(NULL, "HStdOut is invalid!", "WinMain", MB_OK);
}
return 0;
}
and run this executable from command prompt, I am getting a message box "HStdOut is invalid!".
I believe it is because the entry point WinMain
creates a GUI application (not a console application!), and the attempt to GetStdHandle
in a GUI application can not return anything useful because a GUI application does not have any console window.
To fix it, you may call AllocConsole()
at the beginning of your program and then FreeConsole()
at the end of your program. This, however, will always create a new console window even when your program is started from some existing console window such as command prompt.
The proper way to reuse the existing console window (e.g. command prompt's console window) is to replace int APIENTRY WinMain(HINSTANCE hInst, HINSTANCE hInstPrev, PSTR cmdline, int cmdshow)
with int main()
or with int main(int argc, char* argv[])
.
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