I am struggling with using streamstring for a variable Cstring which contains japanese character. I have tried to use imbue or even setlocate method but it does not work, the result when I dubug "ss" is always ???? chracter. Please help!
CString m_strPath = L"適当";
std::stringstream ss;
ss.imbue(std::locale("Japanese"));
ss << m_strPath;
I want ss contain "適当" too.
Related
All case run in Visual C++ 2005 environment
Function definition:
char *PQgetvalue(const PGresult *res, int tup_num, int field_num);
Case 1.
CString dd;
dd=(LPCTSTR) PQgetvalue(res,i,0);
when above is compiled with NO ERROR but dd has store garbage data like: 〱〰71〱1 몭몭몭몭몭몭ꮫꮫꮫꮫ
Case 2.
CString dd;
dd= PQgetvalue(res,i,0);
No Compilation error and provide correct output.
Question: How to convert Char* to CString
Case 3.
CString dd;
dd= PQgetvalue(res,i,0);
CString dd = PQgetvalue(res,i,0);
There is NO Difference between above code. But second case generate compilation error like:
error C2440: 'initializing' :
cannot convert from 'char *' to 'ATL::CStringT<BaseType,StringTraits>'
Please clarify anyone
For the first case. I guess you compile your project with Unicode character set (to verify open project settings dialog "Configuration properties" - "General" - "Character set"). Thus converting char* to const wchar_t* would gives you garbage. I.e. TCHAR is wchar_t when you compile with Unicode.
On the C2440. Please clarify whether code in Case 3 is correct (i.e. you supply all 3 lines to compiler as provided here.). Also I'd suggest you to search MSDN on this error.
I write in mixed mode (C++/CLI) and I can not resolve this problem:
String ^progID = "Matrikon.OPC.Server";
CLSID clsid;
HRESULT result = CLSIDFromProgID(progID, &clsid);
error C2664: 'CLSIDFromProgID' : cannot convert parameter 1 from 'System::String ^' to 'LPCOLESTR'
How can I convert String^ to LPCOLESTR ?
Thanks!
I made another way:
// 1.
pin_ptr<const WCHAR> str = PtrToStringChars(progID);
LPCOLESTR coleString = (LPWSTR)str;
I have found that pin_ptr will be released if goes out of scope Define the Scope of Pinning Pointers and pin_ptr (C++/CLI)
This code works well for me:
// 2. this is the same like (1.)
String ^progID2 = "Matrikon.OPC.Simulation.1";// This is example of dynamic string
pin_ptr<const WCHAR> PINprogID2 = PtrToStringChars(progID2);
CLSID clsid2;
HRESULT result2 = CLSIDFromProgID(PINprogID2, &clsid2); //(LPCOLESTR, &CLSID)
Another example:
// 3.
pin_ptr<const WCHAR> sclsid3 = PtrToStringChars("{63D5F432-CFE4-11d1-B2C8-0060083BA1FB}");
CLSID clsid3;
CLSIDFromString((WCHAR*)sclsid3, &clsid3); //(LPOLESTR, &CLSID)
I am not much experienced and I am not sure if there are some lack of memory, but I think those codes are correct.
Avoid using the hammer for every nail. C++/CLI lets you just as easily use native types. So it is simply:
LPCOLESTR progid = L"Matrikon.OPC.Server";
// etc..
Non-zero odds (always say why) that you can simply use Type::GetTypeFromProgID().
First, lets convert System::String to char*
IntPtr p = Marshal::StringToHGlobalAnsi(progID);
char *pNewCharStr = static_cast<char*>(p.ToPointer());
second, casting char * to LPCOLESTR using ATL conversion macro:
LPCOLESTR converted_string = A2COLE(pNewCharStr);
I've seen lots of answers to this, but I cannot seem to get any to work. I think I'm getting confused between variable types. I have an input from NetworkStream that is put a hex code into a String^. I need to take part of this string, convert it to a number (presumably int) so I can add some arithemetic, then output the reult on the form. The code I have so far:
String^ msg; // gets filled later, e.g. with "A55A6B0550000000FFFBDE0030C8"
String^ test;
//I have selected the relevant part of the string, e.g. 5A
test = msg->Substring(2, 2);
//I have tried many different routes to extract the numverical value of the
//substring. Below are some of them:
std::stringstream ss;
hexInt = 0;
//Works if test is string, not String^ but then I can't output it later.
ss << sscanf(test.c_str(), "%x", &hexInt);
//--------
sprintf(&hexInt, "%d", test);
//--------
//And a few others that I've deleted after they don't work at all.
//Output:
this->textBox1->AppendText("Display numerical value after a bit of math");
Any help with this would be greatly appreciated.
Chris
Does this help?
String^ hex = L"5A";
int converted = System::Convert::ToInt32(hex, 16);
The documentation for the Convert static method used is on the MSDN.
You need to stop thinking about using the standard C++ library with managed types. The .Net BCL is really very good...
Hope this helps:
/*
the method demonstrates converting hexadecimal values,
which are broken into low and high bytes.
*/
int main(){
//character buffer
char buf[1];
buf[0]= 0x06; //buffer initialized to some hex value
buf[1]= 0xAE; //buffer initialized to some hex value
int number=0;
//number generated by binary shift of high byte and its OR with low byte
number = 0xFFFF&((buf[1]<<8)|buf[0]);
printf("%x",number); //this prints AE06
printf(“%d”,number); //this prints the integer equivalent
getch();
}
how do I set a value of a textbox in Visual C++?
I have been trying the following but the line strTemp.Format("%d", nNbr); does not compile
thanks
int nNbr = 5;
CString strTemp;
strTemp.Format("%d", nNbr);
textBox.SetWindowTextW(strTemp);
You probably need to use the _T macro in order to support both ANSI and UNICODE builds of your application:
int nNbr = 5;
CString strTemp;
strTemp.Format(_T("%d"), nNbr);
textBox.SetWindowText(strTemp);
I want to write
int i=4;
textBox1->Text = i;
But it is giving compilation error for type mismatch. How to do box or typecast this?
Sorry for answering the quesition myself. But I just got it while searching.
There is a very easy method
int i=4;
textBox1->Text = Convert::ToString(i);
Instead you could use: textBox1->Text = i.ToString();.
There is a very easy method
int i=4;
textBox1->Text = ""+i;
You need conversion, not a cast. Use itoa() or itow() depending on whether you compile for Unicode.
if you are using CString you can use Format method, or use old c function itoa
example:
CString str;
str.Format("%d",i);
also do not forget to call UpdateData method to update the GUI controls
Convert integer to string and set as value for Text.
CString textVal;
textVal.Format(_T("%d"), i);
textBox1->Text = textVal;