How to convert win32 CHAR(char) type to std string?

Question

Im using the win32 function ReadFile:

CHAR lpBuffer[256]; DWORD nBytesRead; DWORD nCharsWritten; ReadFile(hPipeRead,lpBuffer,sizeof(lpBuffer), &nBytesRead,NULL) || !nBytesRead)

now im catcing the response from stdout in to lpBuffer with this i like to convert it to std string , the problem is when i do simple :

std::string szReturnlpBuffer(lpBuffer);

the value of the szReturnlpBuffer contains alot of garbege carecthers after the real string: its looks like this the szReturnlpBuffer value :

"Im stdout from the Qt applicationÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌÌ"

what im doing wrong here ?

If it's a Qt application, why not use QString?

CMircea
– CMircea

2011-05-07 13:26:13 +00:00
Commented May 7, 2011 at 13:26 — CMircea
– CMircea, Commented May 7, 2011 at 13:26

Yakov Galka · Accepted Answer · 2011-05-07 12:59:47Z

You need to specify the size of the string:

std::string szReturnlpBuffer(lpBuffer, nBytesRead);

because otherwise it reads till it finds a null character, which causes undefined behavior when it gets outside lpBuffer's memory.

ralphtheninja · Accepted Answer · 2011-05-07 13:10:12Z

1

You need to terminate the string with a null character:

lpBuffer[nBytesread] = '\0';

answered May 7, 2011 at 13:10

ralphtheninja

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