在 Windows 里 DLL 卸载自身模块是无法通过字节调用 FreeLibrary 自己来实现的。
在当前线程中调用 FreeLibrary 后，当前模块就会立即被释放掉，而当前线程还没有运行结束。所以程序就运行到了一块不可访问的内存里，产生异常从而导致程序崩溃。
Windows 里面 提供了一条可以用来释放自身模块的函数 FreeLibraryAndExitThread 可以释放自身。
函数
VOID WINAPI FreeLibraryAndExitThread(_In_ HMODULE hLibModule, _In_ DWORD dwExitCode)
#!/usr/env python
"""
:license: MIT
Copyright (C) 2012 HustMoon
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""
from __future__ import with_statement
import zlib, sys
def b128encode(buf, escape=False):
if not buf: return ''
buf = bytearray(buf)
res = bytearray((len(buf) * 8 + 6) / 7)
p, s, i = 0, 1, 0
for n in buf:
res[i] = ((p << (8 - s) | (n >> s)) & 0x7F) | 0x80; i += 1
if s == 7:
res[i] = n | 0x80; i += 1
p, s = 0, 1
else:
p, s = n, (s + 1) % 8
if s != 1:
if s == 2 and p < 0x80:
i -= 1
else:
p = (p << (8 - s)) & 0x7F
p = chr(p)
if escape:
p = p.encode('string-escape')
res[i:] = p
return str(res)
def dcode():
code = r'''def code(__=code):
(_______)=(globals)();del((_______)['code'])
if(((_______).get('__doc__'))is((None))):
(__)=(map)((ord),(__)[(339):]);(______)=[0]*(((((len)((__))+(1))*(7))/(8)));((___),(____),(_____))=((0),(0),(0))
for((__))in((__)):
if((__)<(128)):break
if((____)==(0)):((___),(____))=((__),(1))
else:
(______)[(_____)]=((((___)<<(____))|(((__)&(127))>>((7)-(____))))&(255));(_____)+=(1);((___),(____))=((__),(((____)+(1))%(8)))
if((__)<(128)):
if((____)!=(0)):
(__)=((((___)<<(____))|((__)>>((7)-(____))))&(255))
(______)[(_____):]=[((__))]
elif((____)!=(0)):del((______)[(_____):])
exec((''.join((map)((chr),(______))).decode('zlib')))in((_______))
if(((_______).get('__doc__'))is((None))):(_______)['__doc__']=''
code()
'''
return ''.join([c.encode('string-escape') if ord(c) < 128 else c
for c in zlib.compress(code, 9)])
dcode = dcode()
def encode(infile, outfile):
with open(infile, 'rU') as fp:
code = fp.read().rstrip('n') + 'n'
code = b128encode(zlib.compress(code, 9), True)
code = r'''# -*- coding: latin-1 -*-
code = '%s'
exec(code.decode('zlib'))
''' % (dcode + code)
with open(outfile, 'wb') as fp:
fp.write(code)
def decode(infile, outfile):
with open(infile, 'rU') as fp:
code = fp.read().rstrip('n') + 'n'
code = code.replace("exec(code.decode('zlib'))", "exec(code.decode('zlib')"
".replace('exec','fp.write').replace('in((_______))',''))")
with open(outfile, 'wb') as fp:
eval(compile(code, 's', 'exec'), {'fp':fp})
def main():
try:
if sys.argv[1] == '-d':
func = decode
infile, outfile = sys.argv[2:4]
else:
func = encode
infile, outfile = sys.argv[1:3]
except ValueError:
print >>sys.stderr, 'Usage: zipcode.py [-d] infile.py outfile.py'
raise SystemExit(-1)
func(infile, outfile)
if __name__ == '__main__':
main()
#include <atlbase.h>
#include <atlcom.h>
#include <atlctl.h>
CComModule _Module;
_pAtlModule = &_Module;
原本的程序是控制台的。 但最近需要移植到windows下使用。 所以以MFC来做UI，代码照搬。 一面的一处代码使用了如下语句：
boost::split(v, data, boost::is_any_of(_T("n")));
结果编译时出现了如下错误：
error C4996: 'std::_Copy_impl'
而且是无论怎么修改都不认，差点打算重写了。
在网络中搜索了半天未果，只能自己分析。好在被我乱猜给猜对了。
我猜是因为boost的string和std的string产生了冲突而导致的。 所以添加上boost的string引用后，问题得以解决。
#include <boost/algorithm/string.hpp>
在此留字，希望能帮到遇到同样问题的人。
error LNK2019: unresolved external symbol _deflateEnd@4
#pragma comment(lib, "zlibstat.lib") // for static lib
#pragma comment(lib, "zdll.lib") // for dll lib
error LNK2026: module unsafe for SAFESEH image
error LNK2005: __call_reportfault already defined in LIBCMTD.lib(invarg.obj)或类似其他的error LNK2005:
#pragma comment(linker, "/NODEFAULTLIB:libcmt.lib")
下面两种随便选一种
去掉项目设置中: Linker -> Advanced -> [Image Has Safe Exception Handlers] = “No”
直接在代码中:
#pragma comment(linker, "/SAFESEH:NO")
有六种类型的可重用的库：
静态单线程库 （调试/发行版） 静态多线程的库 （调试/发行版） 动态链接库 (DLL)(Debug/Release) 注意每个库都有一个调试版本和发布版本。
Reusable Library Switch Library Macro(s) Defined
--------------------------- --------- ---------- ----------------------
Single Threaded /ML LIBC (none)
Static MultiThread /MT LIBCMT _MT
Dynamic Link (DLL) /MD MSVCRT _MT and _DLL
Debug Single Threaded /MLd LIBCD _DEBUG
Debug Static MultiThread /MTd LIBCMTD _DEBUG and _MT
Debug Dynamic Link (DLL) /MDd MSVCRTD _DEBUG, _MT, and _DLL
// MyReusableStaticSingleThreadReleaseLibrary.h
#if defined(_MT) || defined(_DEBUG)
#error The /ML compiler switch is required.
#endif
// MyReusableStaticMultithreadReleaseLibrary.h
#if !defined(_MT) || defined(_DLL) || defined(_DEBUG)
#error The /MT compiler switch is required.
#endif
// MyReusableDynamicLinkReleaseLibrary.h
#if !defined(_MT) || !defined(_DLL) || defined(_DEBUG)
#error The /MD compiler switch is required.
#endif
// MyReusableStaticSingleThreadDebugLibrary.h
#if defined(_MT) || !defined(_DEBUG)
#error The /MLd compiler switch is required.
#endif
// MyReusableStaticMultithreadDebugLibrary.h
#if !defined(_MT) || defined(_DLL) || !defined(_DEBUG)
#error The /MTd compiler switch is required.
#endif
// MyReusableDynamicLinkDebugLibrary.h
#if !defined(_MT) || !defined(_DLL) || !defined(_DEBUG)
#error The /MDd compiler switch is required.
#endif
enData = zlib.compress(data)[2:-4]
对应：
compress2(dstbuf, &dstLen, strSrc, srcLen, 6);
deData = zlib.decompress(enData, -zlib.MAX_WBITS)
对应：
bool gzipInflate( const std::string& compressedBytes, std::string& uncompressedBytes ) {
if ( compressedBytes.size() == 0 ) {
uncompressedBytes = compressedBytes ;
return true ;
}
uncompressedBytes.clear() ;
unsigned full_length = compressedBytes.size() ;
unsigned half_length = compressedBytes.size() / 2;
unsigned uncompLength = full_length ;
char* uncomp = (char*) calloc( sizeof(char), uncompLength );
z_stream strm;
strm.next_in = (Bytef *) compressedBytes.c_str();
strm.avail_in = compressedBytes.size() ;
strm.total_out = 0;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
bool done = false ;
//if (inflateInit2(&strm, (16+MAX_WBITS)) != Z_OK)
if (inflateInit2(&strm, -MAX_WBITS) != Z_OK)
{
free( uncomp );
return false;
}
while (!done) {
// If our output buffer is too small
if (strm.total_out >= uncompLength ) {
// Increase size of output buffer
char* uncomp2 = (char*) calloc( sizeof(char), uncompLength + half_length );
memcpy( uncomp2, uncomp, uncompLength );
uncompLength += half_length ;
free( uncomp );
uncomp = uncomp2 ;
}
strm.next_out = (Bytef *) (uncomp + strm.total_out);
strm.avail_out = uncompLength - strm.total_out;
// Inflate another chunk.
int err = inflate (&strm, Z_SYNC_FLUSH);
if (err == Z_STREAM_END) done = true;
else if (err != Z_OK) {
break;
}
}
if (inflateEnd (&strm) != Z_OK) {
free( uncomp );
return false;
}
for ( size_t i=0; i<strm.total_out; ++i ) {
uncompressedBytes += uncomp[ i ];
}
free( uncomp );
return true ;
}
error LNK2019: unresolved external symbol _compress referenced
在 #include <zlib.h> 之前加上 #define ZLIB_WINAPI
#define ZLIB_WINAPI
#include <zlib.h>