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Home/ Questions/Q 8363241
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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T12:07:45+00:00 2026-06-09T12:07:45+00:00

Cstring::Format causes debug assertion in visual studio 2008 at vsprintf.c line 244 with buffer

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Cstring::Format causes debug assertion in visual studio 2008 at vsprintf.c line 244 with “buffer too small”.

//inside the function.

somefile.Open (//open for mode read) //somefile is CFile.

char* buff = new [somefile.GetLength()];

somefile.Read ((void*)buff, somefile.GetLength());

CString cbuff;
cbuff.Format ("%s",buff); //this line causes the debug assertion.

//and so on 

Any idea why CString::Format() causes “buffer too small” error ? This doesn’t always get debug assertion error.

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  1. Editorial Team
    Editorial Team
    2026-06-09T12:07:46+00:00Added an answer on June 9, 2026 at 12:07 pm

    string end with ‘\0’
    so buffer size will not be enough

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