基础问题求教!

[hansin]

1、定义了一个CString类型的成员变量m_shuru,怎样把它的值赋给一个字符串？如char a[50]。
这样好象不行memcpy(A,m_shuru,sizeof（m_shuru）);

2、sscanf(send1,"%x",send);
好象不能将00转换成十六进制数，而01 是可以的。
应该用什么方法呢？

就是我在文本框里输入一个“00”，要用十六进制输出到并口，怎样操作？

[fairyprince]

strcpy(a,mshuru)

[fairyprince]

十六进制字 转 数
nt A16TOI(LPCTSTR Str)
{
int l=strlen(Str);
int ii=0,tVal=0,wl=0;
for(int i=l-1;i >=0;i --)
{
if(Str[i]>47&&Str[i]<58)
{
wl=Str[i]-48;
}else{
if(Str[i]>64&&Str[i]<71)
{
wl=Str[i]-55;
}else{
if(Str[i]>96&&Str[i]<103)
{
wl=Str[i]-87;
}else{
return 0;
}
}
}
tVal+=wl<<(4*ii);
ii++;
}
return tVal;
}

[thisisll]

1
m_shuru.GetBuffer可以得到字符串的指针
CString::GetBuffer
This method retrieves a pointer to the internal character buffer for the CString object. The returned LPTSTR is not const and thus allows direct modification of CString contents.

If nMinBufLength is greater than the length of the current buffer, the call to GetBuffer will destroy the current buffer. Replace it with a buffer of the requested size, and reset the reference count to zero. If you have previously called LockBuffer on this buffer, you will lose the lock on the buffer.

LPTSTR GetBuffer(
int nMinBufLength );
Parameters
nMinBufLength
Specifies the minimum size of the character buffer in characters. This value does not include space for a null terminator.
Return Value
This is an LPTSTR pointer to the character buffer of the null-terminated object.

Remarks
If you use the pointer returned by GetBuffer to change the string contents, you must call ReleaseBuffer before using any other CString methods.

The address returned by GetBuffer may not be valid after the call to ReleaseBuffer since additional CString operations may cause the CString buffer to be reallocated. The buffer will not be reallocated if you do not change the length of the CString.

The buffer memory will be freed automatically when the CString object is destroyed.

Note that, if you keep track of the string length yourself, you should not append the terminating null character. You must, however, specify the final string length when you release the buffer with ReleaseBuffer. If you do append a terminating null character, you should pass –1 for the length to ReleaseBuffer, which will perform a _tcslen on the buffer to determine its length.

Example
The following example demonstrates the use of CString::GetBuffer.

// example for CString::GetBuffer
CString s( "abcd" );
#ifdef _DEBUG
afxDump << "CString s " << s << "\n";
#endif
LPTSTR p = s.GetBuffer( 10 );
lstrcpy( p, _T("Hello") ); // directly access CString buffer
s.ReleaseBuffer( );
#ifdef _DEBUG
afxDump << "CString s " << s << "\n";
#endif

[thisisll]

2不知道你什么意思

[hansin]

2的意思就是文本框里的一个数字,转换为十六进制,比如输入"12",得到的是十六进制的相应符号,但00就没有东西了.

[hansin]

"00"怎么转换为十六进制的数啊? 0x00 ASCII码就是30

[hansin]

char send[2]={0,0};
send="\x12"; //出错提示:left operand must be l-value

而这个为什么又可以呢?
char send[]="45687923";

[linur]

改为 sscanf(send1,"%02x",send); 试试看

[hansin]

不行啊,想把"00"变为单个字节的"\x00"就是不行啊.