一个小细节，很久没有这么写过代码了

最新推荐文章于 2023-03-10 16:23:00 发布

转载最新推荐文章于 2023-03-10 16:23:00 发布 · 94 阅读

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原文链接：http://www.cnblogs.com/beejoy/archive/2009/12/12/1622283.html

本文介绍了一种根据不同的字节序(big endian 或 little endian)来正确获取模块版本信息的方法。通过 SparrowGetVersion 和远程获取版本函数(fnRmtGetVersion)，确保了无论系统采用何种字节序方式，都能准确读取到版本号的各个部分。

前后两段可是大不一样，后面一段才是正确的：

first：

   1:     2:         unsigned long curVersion=0;   3:         unsigned long rmtVersion=0;   4: #if (wxBYTE_ORDER==wxBIG_ENDIAN)   5:         SparrowGetVersion(ModuleName, (unsigned char*)&curVersion, (unsigned char*)(&curVersion+1), (unsigned char*)(&curVersion+2), (unsigned char*)(&curVersion+3));   6:         (*fnRmtGetVersion)(ModuleName, (unsigned char*)&rmtVersion, (unsigned char*)(&rmtVersion+1), (unsigned char*)(&rmtVersion+2), (unsigned char*)(&rmtVersion+3));   7: #else //wxLITTLE_ENDIAN   8:         SparrowGetVersion(ModuleName, (unsigned char*)(&curVersion+3), (unsigned char*)(&curVersion+2), (unsigned char*)(&curVersion+1), (unsigned char*)(&curVersion));   9:         (*fnRmtGetVersion)(ModuleName, (unsigned char*)(&rmtVersion+3), (unsigned char*)(&rmtVersion+2), (unsigned char*)(&rmtVersion+1), (unsigned char*)(&rmtVersion));  10: #endif

another：

   1:     2:         unsigned long curVersion=0x01020304;   3:         unsigned long rmtVersion=0xAABBCCDD;   4: #if (wxBYTE_ORDER==wxBIG_ENDIAN)   5:         SparrowGetVersion(ModuleName, (unsigned char*)&curVersion, (unsigned char*)(&curVersion)+1, (unsigned char*)(&curVersion)+2, (unsigned char*)(&curVersion)+3);   6:         (*fnRmtGetVersion)(ModuleName, (unsigned char*)&rmtVersion, (unsigned char*)(&rmtVersion)+1, (unsigned char*)(&rmtVersion)+2, (unsigned char*)(&rmtVersion)+3);   7: #else //wxLITTLE_ENDIAN   8:         SparrowGetVersion(ModuleName, (unsigned char*)(&curVersion)+3, (unsigned char*)(&curVersion)+2, (unsigned char*)(&curVersion)+1, (unsigned char*)(&curVersion));   9:         (*fnRmtGetVersion)(ModuleName, (unsigned char*)(&rmtVersion)+3, (unsigned char*)(&rmtVersion)+2, (unsigned char*)(&rmtVersion)+1, (unsigned char*)(&rmtVersion));  10: #endif

转载于:https://www.cnblogs.com/beejoy/archive/2009/12/12/1622283.html