Repeat character is getting skipped while dumping path programmatically in powershell.

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I am dumping characters one by one of a script file path onto powershell console using SendMessage API.

At the first execution of program, powershell skips the repeated character from a path which creates an issue.

For e.g. "C:\myFolder\abbc\test.ps1"

From above path when I dump a characters onto powershell window, it skips 1 b from "abbc" so the final path that gets dumped on console is "C:\myFolder\abc\test.ps1".

This happens only first execution of application, on subsequent executions it works fine and accepts repeat characters as well.

What I have tried:

I tried adding sleep time of 1 seconds after before dumping other character.

[EDIT by Jochen Arndt: Copied code and text from comment]

C++

for(int i = 0;scriptPath[i] != '\0';i++)
{
    ::SendMessage(g_hwndConsole,WM_CHAR,scriptPath[i],1L);
    Sleep(3*1000);
}

Here g_hwndConsole is the powershell console handle
[/EDIT]

Posted 2-Aug-17 21:29pm

GVS13

Updated 2-Aug-17 22:49pm

Jochen Arndt

v2

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Jochen Arndt 3-Aug-17 3:44am

Please show the code that dumps (the message that is send).

When sending to another application you should generally use PostMessage instead of SendMessage.

GVS13 3-Aug-17 3:59am

for(int i = 0;scriptPath[i] != '\0';i++)
{
::SendMessage(g_hwndConsole,WM_CHAR,scriptPath[i],1L);
Sleep(3*1000);
}

Here g_hwndConsole is the powershell console handle

2 solutions

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Jochen Arndt · Answer 1 · 2017-08-02T22:38:00

As already mentioned in my comment:
Never use SendMessage when the receiving window is not owned by the thread sending the message. Use PostMessage instead. There should be also no need to set a repeat count of one. Try this instead:

::PostMessage(g_hwndConsole, WM_CHAR, scriptPath[i], 0);

Richard MacCutchan · Answer 2 · 2017-08-02T22:49:00

Solution 2

See WM_CHAR message (Windows)[^] for a proper explanation of this message.

Posted 2-Aug-17 22:49pm

Richard MacCutchan

Comments

GVS13 3-Aug-17 5:06am

Am I missing something in that? Can you please help me to get that point?

Richard MacCutchan 3-Aug-17 5:13am

You need to look at the LPARAM value you are sending, which specifies a repeat count. That may be the problem.