关于C#：sprintf_s写入初始化缓冲区时失败

swprintf_s fails when writing to initialized buffer

我正在使用Visual Studio 2010在Windows中用C编写程序。我正在使用swprintf_s函数将格式化的字符串写入wchar_t缓冲区。
尝试写入已初始化的缓冲区时，出现以下错误。

1	Unhandled exception at 0x77b3fbda in svats.exe: 0xC00000FD: Stack overflow.

有时

1	Unhandled exception at 0xfefefefe in svats.exe: 0xC0000005: Access violation.

这是产生访问冲突的代码。

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wchar_t wBuff[1024] = L"b";
int test;
test = swprintf_s(wBuff,sizeof(wBuff),L"a%s","test");

和堆栈溢出的代码。

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wchar_t wBuff[1024] = L"b";
int test;
test = swprintf_s(wBuff,sizeof(wBuff),L"a%s",L"test");

现在第二段代码已经工作了一次，不知道为什么。

有人知道是什么问题吗？

PS。这些文件没有被加载，有人知道为什么吗？是因为visual studio是32位，而我的操作系统是64位？

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'svats.exe': Loaded 'C:\\Windows\\SysWOW64\
tdll.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\kernel32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\KernelBase.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\user32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\gdi32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\lpk.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\usp10.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\msvcrt.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\advapi32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\sechost.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\
pcrt4.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\sspicli.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\cryptbase.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\ws2_32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\
si.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\imm32.dll', Cannot find or open the PDB file
'svats.exe': Loaded 'C:\\Windows\\SysWOW64\\msctf.dll', Cannot find or open the PDB file