A WinCE 7.0 Win32 Smart Device project was built, adding some. cpp and. h files to the project.First, CString undefined error occurs at compile time, so #include "atlstr.h".After compiling this WinCE7.0 Win32 project, the Debug version link appears with the following error:1>protocolparse.obj:error LNK2001: unresolved external symbol "Class Atl::ctracecategory atl::atltracestring" ([email protected]@@[emailprotected]@a) 1>protocolparse.obj:error LNK20
Write the program to achieve CString conversion to char *, night to find some methods, there will always be errors, not what I want.For example, the following two conversion formats:1.2.The value of CHITEM1 is just the first letter of the string strItem1.The right way:This is the only way to get all the characters of the string.wchar_t * converted to Intint intItem1 = _ttol (CHITEM1);CString converted to ch
From example to wxstring
const char* chars = "Hello world";// assuming your string is encoded as UTF-8, change the wxConv* parameter as neededwxString mystring(chars, wxConvUTF8);Wxstring to char *
void my_function(const char* foo){}...wxString mystring(wxT("HelloWorld"));// you could give the encoding you want as a parameter to mb_str(), e.g. mb_str(wxConvUTF8)my_function( mystring.mb_str() );
Mb_str () returns a temporary pointer; if you need the output for more than one function call (as is t
Error C2065: "CString": Undeclared identifier, c2065cstring
Compile the article:When you use the GetAdaptersAddresses function to obtain the code in a physical MAC address, the following error occurs:Error 3 error C2065: "CString": Undeclared identifier f: \ ccprojects \ obtain Nic physical address mac address \ temporary. h 13 1 obtain the NIC physical address MAC address
Environment: Windows 7 + VS2010
Getbuffer () is mainly used to lock the buffer length of the string, while releasebuffer is used to unlock the cstring object.CodeTo achieve adaptive length growth.
Whether to call releasebuffer () after getbufer depends onProgramWhether to continue using this string variable and whether to dynamically change its length. It is not a good programming habit, and so on.
If you exit the function after getbuffer, and the local variables do not exist, it
Store the hexadecimal form of the character in byte [] as a string into the cstring object and return:
C ++ code:
/* Function: Convert the ASCII code of characters in pmsgid into numeric characters in hexadecimal notation, store it in retvalue, and return @ pmsgid: Source string @ retvalue: save the returned value */void getmsgid (char pmsgid [], cstring retvalue) {byte * P = (byte *) pmsgid; byte temp [
In vs.net 2005 smartdevice development, the WMP. ocx control is used. The return value of the control interface function is ccombstr.
ProgramTo convert the returned value to cstring. After checking a lot of information, you can use convertbstrtostring () in comutil. H. However, Chinese characters are garbled. Finally, we found that ccombstr can be converted to BSTR, so there is a way to convert it in the simplest way:
The purpose is to extract the IP address and port number from the following string
Cstring temp = "227 entering passive mode
Void cmfctestdlg: onbnclickedok ()
{// Todo: add the control notification handler code hereCstring temp = "227 entering passive mode
Int base = temp. Find ('Int Top = temp. Find ('> ');STR = temp. mid (base + 1, top-base-1 );// MessageBox (STR );
Base = 0;Top = Str. getlength ()-1;Int index;
If you write a program in the Unicode environment today and convert the cstring to the const char * type, an error is returned: "cannot convert parameter 1 from 'wchar _ T * 'to 'const char *'". After a long search, we finally found three solutions:
First: The following method can be used in the com environment,
Cstring strsql;
Strsql. Format (_ T ('insert into class (name) values ('% s ')'),
M_strname.get
In case of non-Chinese:
CString s ("Hello World");
Wcout
Wcout
If you include Chinese, you need to add:
Wcout.imbue (Std::locale ("CHS"));
As follows
CString s ("Hello World");
Wcout.imbue (Std::locale ("CHS"));
Wcout
Wcout
Above
Function for separating strings using MFCAfxextractsubstring(Cstring rstring, lpctstr lpszfullstring, int isubstring, tchar chsep = '\ n'). The following describes its usage:Note: This article is original in rainy8758. Please indicate the source for reprinting:Http://blog.hjenglish.com/rainy8758/articles/1010963.html
Parameter description:
Rstring; lpszfullstring to be split; isubstring; delimiter between chsep substrings
For example, if the
That is, the following functions are implemented:
1
Cstring STR;
2
Double
D
=
10.24
;
3
Str. Format (
"
D = %. 2f
"
,
10.24
);
In fact, using the C ++ standard library is also relatively simple,CodeAs follows:
# Include
Sstream
>
Using
Namespace
STD;..Ostringstream Buf;
Double
D
=
10.24
;Buf
"
D =
"
D
Endl;
Buf. STR () is a string of the string type whose cont
We may need to output Chinese character strings or cstring types in the console, but direct output is obviously not good. After trying, we can use the following method to output normally:
# Include
KeyCodeIn this sentence
Wcout. imbue (locale ("CHS "));
Here, imbue indicates to set the current output character set format. locale ("CHS") indicates that the local character set format is CHS, while CHS indicates Simplified Chinese.
Use the following function.Cstring cselectdlg: varianttocstring (variant var){Cstring strvalue;_ Variant_t var_t;_ Bstr_t bst_t;Time_t cur_time;Ctime time_value;Colecurrency var_currency;Switch (var. Vt){Case vt_empty:Strvalue = _ T ("");Break;Case vt_ui1:Rvalue. Format ("% d", var. bval );Break;Case vt_i2:Strvalue. Format ("% d", var. ival );Break;Case vt_i4:Strvalue. Format ("% d", var. lval );Break;Case vt_r4:Strvalue. Format ("% F", var. fltval );
Next article...
(8) structure charts of commonly used strings in MFC (this is not a comparison, but it is included here for convenience)
(9) Summary
To sum up, I personally think that cstring is used as much as possible in MFC and ATL. After all, it is a child of Microsoft, and each aspect is more advantageous than others, string is recommended for non-Microsoft platforms or
The looks like this:
BOOL Ishexformat (LPCTSTR pstr) {if (pstr[0] = = L ' 0 ' ((pstr[1) = = L ' x ') | | (pstr[1] = = L ' X '))
{return TRUE;
return FALSE;
BOOL isinputvalid (LPCTSTR pstr) {int i;
BOOL Res;
BOOL Ishex;
i = 0;
res = TRUE;
Ishex = Ishexformat (PSTR);
while (Pstr[i]!= l ') {if (Pstr[i] >= l ' 0 ' pstr[i]
The above is a small series for everyone to bring the CString string input into an inte
The IP address obtained from the IP address control is a DWORD type
With MessageBox how to display the IP address?
DWORD type 32 Bits, each 4-bit is a group of common IP addresses, that is, ***.***.***.***.
Using HiWord, LoWord, Hibyte, Lobyte can resolve the various fields. The reference scenario is as follows:
DWORD dwipaddr;
CString str;
WORD Hiword=hiword (DWIPADDR);
WORD Loword=loword (DWIPADDR);
BYTE Nf1=hibyte (HiWord);
BYTE Nf2=lobyte
Anyone who has used VB knows that the replace in VB is very useful. It seems that there is no ready-made function in C ++ to implement this function (except cstring in MFC). Let's write it by ourselves.CodeImplement the function.
The C ++ implementation is as follows:
# Include # Include Using namespace STD;String Replace (string a, string S, string d ){While
Tags: str nts add BBS--Update useful special TCOMySQL Replace instance description:UPDATE tb1 SET f1=replace (F1, ' abc ', ' Def ');REPLACE (STR,FROM_STR,TO_STR)All occurrences of the string from_str in the string str are replaced by TO_STR, and then the string is returnedThis function is useful for bulk substitution of illegal keywords in data! Here's an example
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