{"id":127,"date":"2015-05-18T12:02:21","date_gmt":"2015-05-18T12:02:21","guid":{"rendered":""},"modified":"2015-05-18T12:02:21","modified_gmt":"2015-05-18T12:02:21","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=127","title":{"rendered":"Qt\u4e0bQString\u8f6cchar*"},"content":{"rendered":"
\n

\n\t\tQt\u4e0b\u9762\uff0c\u5b57\u7b26\u4e32\u90fd\u7528QString\uff0c\u786e\u5b9e\u7ed9\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u65b9\u4fbf\uff0c\u60f3\u60f3VC\u91cc\u9762\u5b9a\u4e49\u7684\u5404\u79cd\u53d8\u91cf\u7c7b\u578b\uff0c\u800c\u4e14\u51fd\u6570\u53c2\u6570\u7c7b\u578b\u4e94\u82b1\u516b\u95e8\uff0c\u7ecf\u5e38\u9700\u8981\u4eca\u5e74\u65b0\u90a3\u4e2a\u7c7b\u578b\u8f6c\u6362\n\t<\/p>\n

\n\t\tQt\u518d\u4f7f\u7528\u7b2c\u4e09\u65b9\u5f00\u6e90\u5e93\u65f6\uff0c\u7531\u4e8e\u5e93\u7684\u7c7b\u578b\u57fa\u672c\u4e0a\u90fd\u662f\u6807\u51c6\u7684\u7c7b\u578b\uff0c\u5b57\u7b26\u4e32\u9047\u7684\u591a\u7684\u5c31\u662fChar*\u7c7b\u578b\n\t<\/p>\n

\n\t\t\u5728Qt\u4e0b\u600e\u6837\u5c06QString\u8f6cchar*\u5462\uff0c\u9700\u8981\u7528\u5230QByteArray\u7c7b\uff0cQByteArray\u7c7b\u7684\u8bf4\u660e\u8be6\u89c1Qt\u5e2e\u52a9\u6587\u6863\u3002\n\t<\/p>\n

\n\t\t\u56e0\u4e3achar*\u6700\u540e\u90fd\u6709\u4e00\u4e2a\u2018\/0\u2019\u4f5c\u4e3a\u7ed3\u675f\u7b26\uff0c\u800c\u91c7\u7528QString::toLatin1()\u65f6\u4f1a\u5728\u5b57\u7b26\u4e32\u540e\u9762\u52a0\u4e0a\u2018\/0\u2019\n\t<\/p>\n

\n\t\t\u65b9\u6cd5\u5982\u4e0b\uff1a\n\t<\/p>\n

\n\t\tQstring  str;\n\t<\/p>\n

\n\t\tchar*  ch;\n\t<\/p>\n

\n\t\tQByteArray ba = str.toLatin1();    \n\t<\/p>\n

\n\t\tch=ba.data();\n\t<\/p>\n

\n\t\t\u8fd9\u6837\u5c31\u5b8c\u6210\u4e86QString\u5411char*\u7684\u8f6c\u5316\u3002\u7ecf\u6d4b\u8bd5\u7a0b\u5e8f\u8fd0\u884c\u65f6\u4e0d\u4f1a\u51fa\u73b0bug\n\t<\/p>\n

\n\t\t\u7528toLatin1\u597d\u50cf\u4e0d\u652f\u6301\u4e2d\u6587\uff0c\u7528toLocal8Bit\u53ef\u4ee5\u652f\u6301\u3002<\/span>\n\t<\/p>\n

\n\t\t\u6ce8\u610f\u7b2c\u4e09\u884c\uff0c\u4e00\u5b9a\u8981\u52a0\u4e0a\uff0c\u4e0d\u53ef\u4ee5str.toLatin1().data()\u8fd9\u6837\u4e00\u90e8\u5b8c\u6210\uff0c\u53ef\u80fd\u4f1a\u51fa\u9519\u3002<\/span>\n\t<\/p>\n

\n\t\t \n\t<\/p>\n

\n\t\t\u8865\u5145\uff1a\u4ee5\u4e0a\u65b9\u6cd5\u5f53QString\u91cc\u4e0d\u542b\u4e2d\u6587\u65f6\uff0c\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u662fQString\u5185\u542b\u6709\u4e2d\u6587\u65f6\uff0c\u8f6c\u6362\u4e3achar*\u5c31\u662f\u4e71\u7801\uff0c\u91c7\u7528\u5982\u4e0b\u65b9\u6cd5\u89e3\u51b3\uff1a<\/span>\n\t<\/p>\n

\n\t\t\u65b9\u6cd51\uff1a<\/span>\n\t<\/p>\n

\n\t\t\u6dfb\u52a0GBK\u7f16\u7801\u652f\u6301\uff1a\n\t<\/p>\n

\n\t\t#include <QTextCodec>\n\t<\/p>\n

\n\t\tQTextCodec::setCodecForTr(QTextCodec::codecForName(“GBK”));
\nQTextCodec::setCodecForLocale(QTextCodec::codecForName(“GBK”));\n\t<\/p>\n

\n\t\t\u7136\u540e\u6539\u53d8\u4e0a\u9762\u7684\u7b2c\u4e09\u884c\u4e3a\uff1aQByteArray ba = str.toLoacl8Bit();      toLoacl8Bit\u652f\u6301\u4e2d\u6587\n\t<\/p>\n

\n\t\t\u65b9\u6cd52\uff1a<\/span>\n\t<\/p>\n

\n\t\t\u5148\u5c06QString\u8f6c\u4e3a\u6807\u51c6\u5e93\u4e2d\u7684string\u7c7b\u578b\uff0c\u7136\u540e\u5c06string\u8f6c\u4e3achar*\uff0c\u5982\u4e0b\uff1a\n\t<\/p>\n

\n\t\tstd::string str = filename.toStdString();\n\t<\/p>\n

\n\t\tconst char* ch = str.c_str();\n\t<\/p>\n

\n\t\t \n\t<\/p>\n

\n\t\t\u6211\u5e38\u7528\u7684\u65b9\u6cd5\uff1a\n\t<\/p>\n

char<\/span> <\/span>*<\/span>QString_to_char<\/span>(<\/span>QString<\/span> <\/span>qstring<\/span>)<\/span> <\/p>\n

{<\/span><\/pre>\n
 <\/span>char<\/span> <\/span>*<\/span>str<\/span>=<\/span>NULL<\/span>;<\/span><\/pre>\n
<\/pre>\n
 <\/span>std<\/span>::<\/span>string<\/span> <\/span>str2<\/span>=<\/span>qstring<\/span>.<\/span>toStdString<\/span>();<\/span><\/pre>\n
<\/pre>\n
 <\/span>str<\/span>=(<\/span>char<\/span> <\/span>*)<\/span>malloc<\/span>(<\/span>str2<\/span>.<\/span>size<\/span>()+<\/span>1<\/span>);<\/span><\/pre>\n
 <\/span>if<\/span>(<\/span>str<\/span>==<\/span>NULL<\/span>)<\/span> <\/span>return<\/span> <\/span>NULL<\/span>;<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>str<\/span>,<\/span>NULL<\/span>,<\/span>str2<\/span>.<\/span>size<\/span>()+<\/span>1<\/span>);<\/span><\/pre>\n
 <\/span>strcat<\/span>(<\/span>str<\/span>,(<\/span>char<\/span> <\/span>*)<\/span>str2<\/span>.<\/span>data<\/span>());<\/span><\/pre>\n
<\/pre>\n
 <\/span>return<\/span> <\/span>str<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
\u4e0d\u8fc7\u8f6c\u6362\u540e\u4e8bUTF-8\u7f16\u7801\u7684\uff0c\u53ef\u4ee5\u518d\u8f6c\u6362\u4e3a\u5176\u5b83\u7f16\u7801\u683c\u5f0f\uff1a<\/span><\/pre>\n
wchar_t<\/span> <\/span>*<\/span> <\/span>ANSIToUnicode<\/span>(<\/span> <\/span>const<\/span> <\/span>char<\/span>*<\/span> <\/span>str<\/span> <\/span>)<\/span> \r\n
{<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>textlen<\/span> <\/span>;<\/span><\/pre>\n
 <\/span>wchar_t<\/span> <\/span>*<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
 <\/span>textlen<\/span> <\/span>=<\/span> <\/span>MultiByteToWideChar<\/span>(<\/span> <\/span>CP_ACP<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,-<\/span>1<\/span>,<\/span> <\/span>NULL<\/span>,<\/span>0<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>result<\/span> <\/span>=<\/span> <\/span>(<\/span>wchar_t<\/span> <\/span>*)<\/span>malloc<\/span>((<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>wchar_t<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>result<\/span>,<\/span>0<\/span>,(<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>wchar_t<\/span>));<\/span><\/pre>\n
 <\/span>MultiByteToWideChar<\/span>(<\/span>CP_ACP<\/span>,<\/span> <\/span>0<\/span>,<\/span>str<\/span>,-<\/span>1<\/span>,(<\/span>LPWSTR<\/span>)<\/span>result<\/span>,<\/span>textlen<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
char<\/span> <\/span>*<\/span> <\/span>UnicodeToANSI<\/span>(<\/span> <\/span>const<\/span> <\/span>wchar_t<\/span>*<\/span> <\/span>str<\/span> <\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>char<\/span>*<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>textlen<\/span>;<\/span><\/pre>\n
 <\/span>textlen<\/span> <\/span>=<\/span> <\/span>WideCharToMultiByte<\/span>(<\/span> <\/span>CP_ACP<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,<\/span> <\/span>-<\/span>1<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>NULL<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>result<\/span> <\/span>=(<\/span>char<\/span> <\/span>*)<\/span>malloc<\/span>((<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>char<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span> <\/span>result<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>sizeof<\/span>(<\/span>char<\/span>)<\/span> <\/span>*<\/span> <\/span>(<\/span> <\/span>textlen<\/span> <\/span>+<\/span> <\/span>1<\/span> <\/span>)<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>WideCharToMultiByte<\/span>(<\/span> <\/span>CP_ACP<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,<\/span> <\/span>-<\/span>1<\/span>,<\/span> <\/span>result<\/span>,<\/span> <\/span>textlen<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>NULL<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
wchar_t<\/span> <\/span>*<\/span> <\/span>UTF8ToUnicode<\/span>(<\/span> <\/span>const<\/span> <\/span>char<\/span>*<\/span> <\/span>str<\/span> <\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>textlen<\/span> <\/span>;<\/span><\/pre>\n
 <\/span>wchar_t<\/span> <\/span>*<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
 <\/span>textlen<\/span> <\/span>=<\/span> <\/span>MultiByteToWideChar<\/span>(<\/span> <\/span>CP_UTF8<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,-<\/span>1<\/span>,<\/span> <\/span>NULL<\/span>,<\/span>0<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>result<\/span> <\/span>=<\/span> <\/span>(<\/span>wchar_t<\/span> <\/span>*)<\/span>malloc<\/span>((<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>wchar_t<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>result<\/span>,<\/span>0<\/span>,(<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>wchar_t<\/span>));<\/span><\/pre>\n
 <\/span>MultiByteToWideChar<\/span>(<\/span>CP_UTF8<\/span>,<\/span> <\/span>0<\/span>,<\/span>str<\/span>,-<\/span>1<\/span>,(<\/span>LPWSTR<\/span>)<\/span>result<\/span>,<\/span>textlen<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
char<\/span> <\/span>*<\/span> <\/span>UnicodeToUTF8<\/span>(<\/span> <\/span>const<\/span> <\/span>wchar_t<\/span>*<\/span> <\/span>str<\/span> <\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>char<\/span>*<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>textlen<\/span>;<\/span><\/pre>\n
 <\/span>textlen<\/span> <\/span>=<\/span> <\/span>WideCharToMultiByte<\/span>(<\/span> <\/span>CP_UTF8<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,<\/span> <\/span>-<\/span>1<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>NULL<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>result<\/span> <\/span>=(<\/span>char<\/span> <\/span>*)<\/span>malloc<\/span>((<\/span>textlen<\/span>+<\/span>1<\/span>)*<\/span>sizeof<\/span>(<\/span>char<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>result<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>sizeof<\/span>(<\/span>char<\/span>)<\/span> <\/span>*<\/span> <\/span>(<\/span> <\/span>textlen<\/span> <\/span>+<\/span> <\/span>1<\/span> <\/span>)<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>WideCharToMultiByte<\/span>(<\/span> <\/span>CP_UTF8<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>str<\/span>,<\/span> <\/span>-<\/span>1<\/span>,<\/span> <\/span>result<\/span>,<\/span> <\/span>textlen<\/span>,<\/span> <\/span>NULL<\/span>,<\/span> <\/span>NULL<\/span> <\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>result<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
\/*\u5bbd\u5b57\u7b26\u8f6c\u6362\u4e3a\u591a\u5b57\u7b26Unicode<\/span> <\/span>-<\/span> <\/span>ANSI*\/<\/span><\/pre>\n
<\/pre>\n
char<\/span>*<\/span> <\/span>w2m<\/span>(<\/span>const<\/span> <\/span>wchar_t<\/span>*<\/span> <\/span>wcs<\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>len<\/span>;<\/span><\/pre>\n
 <\/span>char<\/span>*<\/span> <\/span>buf<\/span>;<\/span><\/pre>\n
 <\/span>len<\/span> <\/span>=<\/span>wcstombs<\/span>(<\/span>NULL<\/span>,<\/span>wcs<\/span>,<\/span>0<\/span>);<\/span><\/pre>\n
 <\/span>if<\/span> <\/span>(<\/span>len<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span> <\/span>return<\/span> <\/span>NULL<\/span>;<\/span><\/pre>\n
 <\/span>buf<\/span> <\/span>=<\/span> <\/span>(<\/span>char<\/span> <\/span>*)<\/span>malloc<\/span>(<\/span>sizeof<\/span>(<\/span>char<\/span>)*(<\/span>len<\/span>+<\/span>1<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>buf<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>sizeof<\/span>(<\/span>char<\/span>)<\/span> <\/span>*(<\/span>len<\/span>+<\/span>1<\/span>));<\/span><\/pre>\n
 <\/span>len<\/span> <\/span>=<\/span>wcstombs<\/span>(<\/span>buf<\/span>,<\/span>wcs<\/span>,<\/span>len<\/span>+<\/span>1<\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>buf<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
\/*\u591a\u5b57\u7b26\u8f6c\u6362\u4e3a\u5bbd\u5b57\u7b26ANSI<\/span> <\/span>-<\/span> <\/span>Unicode*\/<\/span><\/pre>\n
<\/pre>\n
wchar_t<\/span>*<\/span> <\/span>m2w<\/span>(<\/span>const<\/span> <\/span>char<\/span>*<\/span> <\/span>mbs<\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>int<\/span> <\/span>len<\/span>;<\/span><\/pre>\n
 <\/span>wchar_t<\/span>*<\/span> <\/span>buf<\/span>;<\/span><\/pre>\n
 <\/span>len<\/span> <\/span>=<\/span>mbstowcs<\/span>(<\/span>NULL<\/span>,<\/span>mbs<\/span>,<\/span>0<\/span>);<\/span><\/pre>\n
 <\/span>if<\/span> <\/span>(<\/span>len<\/span> <\/span>==<\/span> <\/span>0<\/span>)<\/span> <\/span>return<\/span> <\/span>NULL<\/span>;<\/span><\/pre>\n
 <\/span>buf<\/span> <\/span>=<\/span> <\/span>(<\/span>wchar_t<\/span> <\/span>*)<\/span>malloc<\/span>(<\/span>sizeof<\/span>(<\/span>wchar_t<\/span>)*(<\/span>len<\/span>+<\/span>1<\/span>));<\/span><\/pre>\n
 <\/span>memset<\/span>(<\/span>buf<\/span>,<\/span> <\/span>0<\/span>,<\/span> <\/span>sizeof<\/span>(<\/span>wchar_t<\/span>)<\/span> <\/span>*(<\/span>len<\/span>+<\/span>1<\/span>));<\/span><\/pre>\n
 <\/span>len<\/span> <\/span>=<\/span>mbstowcs<\/span>(<\/span>buf<\/span>,<\/span>mbs<\/span>,<\/span>len<\/span>+<\/span>1<\/span>);<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>buf<\/span>;<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
char<\/span>*<\/span> <\/span>ANSIToUTF8<\/span>(<\/span>const<\/span> <\/span>char<\/span>*<\/span> <\/span>str<\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>UnicodeToUTF8<\/span>(<\/span>ANSIToUnicode<\/span>(<\/span>str<\/span>));<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
char<\/span>*<\/span> <\/span>UTF8ToANSI<\/span>(<\/span>const<\/span> <\/span>char<\/span>*<\/span> <\/span>str<\/span>)<\/span><\/pre>\n
{<\/span><\/pre>\n
 <\/span>return<\/span> <\/span>UnicodeToANSI<\/span>(<\/span>UTF8ToUnicode<\/span>(<\/span>str<\/span>));<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/span><\/p>\n
\n\t\t \n\t<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\n
\n\t\tQt\u4e0b\u9762\uff0c\u5b57\u7b26\u4e32\u90fd\u7528QString\uff0c\u786e\u5b9e\u7ed9\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u65b9\u4fbf\uff0c\u60f3\u60f3VC\u91cc\u9762\u5b9a\u4e49\u7684\u5404\u79cd\u53d8\u91cf\u7c7b\u578b\uff0c\u800c\u4e14\u51fd\u6570\u53c2\u6570\u7c7b\u578b\u4e94\u82b1\u516b\u95e8\uff0c\u7ecf\u5e38\u9700\u8981\u4eca\u5e74\u65b0\u90a3\u4e2a\u7c7b\u578b\u8f6c\u6362\n\t<\/p>\n
\n\t\tQt\u518d\u4f7f\u7528\u7b2c\u4e09\u65b9\u5f00\u6e90\u5e93\u65f6\uff0c\u7531\u4e8e\u5e93\u7684\u7c7b\u578b\u57fa\u672c\u4e0a\u90fd\u662f\u6807\u51c6\u7684\u7c7b\u578b\uff0c\u5b57\u7b26\u4e32\u9047\u7684\u591a\u7684\u5c31\u662fChar*\u7c7b\u578b\n\t<\/p>\n
\n\t\t\u5728Qt\u4e0b\u600e\u6837\u5c06QString\u8f6cchar*\u5462\uff0c\u9700\u8981\u7528\u5230QByteArray\u7c7b\uff0cQByteArray\u7c7b\u7684\u8bf4\u660e\u8be6\u89c1Qt\u5e2e\u52a9\u6587\u6863\u3002\n\t<\/p>\n
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