swprintf_s with *wstring (Resolved)

[bkelly13]

Windows XP, Visual Studio 2008, C++

bool procedure( wstring *target )
{...
int wrote_count = swprintf_s(
text_to_log,
MAX_SIZE,
L"Target is %ls",
target );
... }

The debugger shows text "Messsage" in variable target but text_to_log does not have that text. text_to_log is declared as WCHAR text_to_log[ MAX_SIZE ] where MAX_SIZE is 400. I have tried creating a local varible of type wstring and the text will copy from target to that local string. Using that local string in the printf statement produces the same result. What do I need to change to incorporate the text from target into the text of text_to_log?

Thank you for your time If you work with telemetry, please check this bulletin board: www.irigbb.com

[David Crow]

What is the value of wrote_count? If -1, what is errno set to?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

[Graham Breach]

Just a guess, but try using target->c_str() in the swprintf_s function call instead of just target. I believe the printf functions expect C-style strings, not C++ string classes.

[bkelly13]

wrote_count is 57, I simplified some when writing this post. That value matches what is in the string it writes to. The text from target is simply missing in action.

Thank you for your time If you work with telemetry, please check this bulletin board: www.irigbb.com

[bkelly13]

Just tried that: error 2228, left of .c_str() must have class/struct/union Edit:

(*target).c_str()

You got me most of the way there, evidently there is a precedence problem. With the above the text shows up. Thank you for your help.

Thank you for your time If you work with telemetry, please check this bulletin board: www.irigbb.com

[David Crow]

bkelly13 wrote:

The text from target is simply missing in action.

How are you verifying this?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

[Lost User]

Why not just:

target->c_str()

?