文本控件中读出来的科学计数法文本，怎么精确转换成float类型

liuxuwentiger 2015-12-11 09:36:41

MFC对话框窗口上，有一个EDIT控件，里面的数据都是仪器测试出来，以科学计数法记录的数据，怎么把数据转换成精确的浮点数？求各位大侠指点，谢谢了。

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赵4老师 2015-12-14

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#include <stdio.h>
#include <tchar.h>
TCHAR s[]=_T(
"+1.946778660E+01,+8.948916161E+01,+0,+0\n"
"+1.930291487E+02,+8.921232518E+01,+0,+0\n"
"+2.063480938E+03,+8.135056168E+01,+0,+0\n"
"+4.157431443E+03,+6.557659563E+01,+0,+0\n"
"+5.722808011E+03,+5.061641198E+01,+0,+0\n"
"+6.670965858E+03,+3.889735674E+01,+0,+0\n"
"+7.244019312E+03,+2.993750144E+01,+0,+0\n"
);
TCHAR *p;
double v;
int n,k;
int main() {
    p=s;
    while (1) {
        k=_stscanf(p,_T("%lf%n"),&v,&n);
        _tprintf(_T("k,v,n=%d,%.9lE,%d\n"),k,v,n);
        if (1==k) {
            p+=n;
        } else if (0==k) {
            _tprintf(_T("skip char[%c]\n"),p[0]);
            p++;
        } else {//EOF==k
            break;
        }
    }
    _tprintf(_T("End.\n"));
    return 0;
}
//k,v,n=1,1.946778660E+001,16
//k,v,n=0,1.946778660E+001,16
//skip char[,]
//k,v,n=1,8.948916161E+001,16
//k,v,n=0,8.948916161E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,1.930291487E+002,17
//k,v,n=0,1.930291487E+002,17
//skip char[,]
//k,v,n=1,8.921232518E+001,16
//k,v,n=0,8.921232518E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,2.063480938E+003,17
//k,v,n=0,2.063480938E+003,17
//skip char[,]
//k,v,n=1,8.135056168E+001,16
//k,v,n=0,8.135056168E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,4.157431443E+003,17
//k,v,n=0,4.157431443E+003,17
//skip char[,]
//k,v,n=1,6.557659563E+001,16
//k,v,n=0,6.557659563E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,5.722808011E+003,17
//k,v,n=0,5.722808011E+003,17
//skip char[,]
//k,v,n=1,5.061641198E+001,16
//k,v,n=0,5.061641198E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,6.670965858E+003,17
//k,v,n=0,6.670965858E+003,17
//skip char[,]
//k,v,n=1,3.889735674E+001,16
//k,v,n=0,3.889735674E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=1,7.244019312E+003,17
//k,v,n=0,7.244019312E+003,17
//skip char[,]
//k,v,n=1,2.993750144E+001,16
//k,v,n=0,2.993750144E+001,16
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=0,0.000000000E+000,2
//skip char[,]
//k,v,n=1,0.000000000E+000,2
//k,v,n=-1,0.000000000E+000,2
//End.
//

洗洗睡去 2015-12-13

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用AfxExtractSubString分割字符串比如

CString str = "123,-456(/t)7.89";
CString output = "";
则
AfxExtractSubString(output, str, 0, ','); //123
AfxExtractSubString(output, str, 1, ',); //-456
AfxExtractSubString(output, str, 2, '/t'); //7.89

然后_ttof

paschen 2015-12-12

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引用 2 楼 liuxuwentiger 的回复:

[quote=引用楼主 liuxuwentiger 的回复:] MFC对话框窗口上，有一个EDIT控件，里面的数据都是仪器测试出来，以科学计数法记录的数据，怎么把数据转换成精确的浮点数？求各位大侠指点，谢谢了。

先谢谢版主回复，数据格式如下： +1.946778660E+01,+8.948916161E+01,+0,+0 +1.930291487E+02,+8.921232518E+01,+0,+0 +2.063480938E+03,+8.135056168E+01,+0,+0 +4.157431443E+03,+6.557659563E+01,+0,+0 +5.722808011E+03,+5.061641198E+01,+0,+0 +6.670965858E+03,+3.889735674E+01,+0,+0 +7.244019312E+03,+2.993750144E+01,+0,+0 UNICODE环境，atof不好使啊 [/quote] 用 _ttof 把你数据先以逗号分割，然后调用即可

liuxuwentiger 2015-12-12