tchar

问题 I am trying to eject my CDRom Drive at the click of a button. This works when the CDRom drive letter is hardcoded, but I am wanting to do it without hardcoding the CDRom Drive. If I find the CDRom drive on my computer and save it to 'TCHAR drive_letter', how can I pull that in to the code below? For some reason, it does not allow me to do 'EjectCdTray(drive_letter);'. The code is shown below: #include <tchar.h> #include <windows.h> #include <mmsystem.h> // for MCI functions // Link to winmm

问题 i asked a question here involving C++ and C# communicating. The problem got solved but led to a new problem. this returns a String (C#) return Marshal.PtrToStringAnsi(decryptsn(InpData)); this expects a TCHAR* (C++) lpAlpha2[0] = Company::Pins::Bank::Decryption::Decrypt::Decryption("123456"); i've googled how to solve this problem, but i am not sure why the String has a carrot(^) on it. Would it be best to change the return from String to something else that C++ would accept? or would i need

问题 I'm trying to get a simple OpenCV sample working in C++ on Windows and my C++ is more than rusty. The sample is fairly simple: #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <iostream> using namespace cv; using namespace std; int main( int argc, char** argv ) { if( argc != 2) { cout <<" Usage: display_image ImageToLoadAndDisplay" << endl; return -1; } Mat image; image = imread(argv[1], IMREAD_COLOR); // Read the file if(! image.data ) // Check for invalid

问题 We need to pass a format _TCHAR * string, and a number of char * strings into a function with variable-length args: inline void FooBar(const _TCHAR *szFmt, const char *cArgs, ...) { //... } So it can be called like so: char *foo = "foo"; char *bar = "bar"; LogToFileA(_T("Test %s %s"), foo, bar); Obviously a simple fix would be to use _TCHAR instead of char, but we don't have that luxury unfortunately. We need to use this with va_start, etc so we can format a string: va_list args; _TCHAR szBuf

问题 When you build an app on Windows using TCHAR support, %s in _tprintf() means char * string for Ansi builds and wchar_t * for Unicode builds while %S means the reverse. But are there any format specifiers that always mean char * string no matter if it's an Ansi or Unicode build? Since even on Windows UTF-16 is not really used for files or networking it turns out to still be fairly often that you'll want to deal with byte-based strings regardless of the native character type you compile your

问题 I am revising some very old (10 years) C code. The code compiles on Unix/Mac with GCC and cross-compiles for Windows with MinGW. Currently there are TCHAR strings throughout. I'd like to get rid of the TCHAR and use a C++ string instead. Is it still necessary to use the Windows wide functions, or can I do everything now with Unicode and UTF-8? 回答1: Windows uses UTF16 still and most likely always will. You need to use wstring rather than string therefore. Windows APIs don't offer support for

问题 This question already has answers here : Convert char to TCHAR* argv[] (2 answers) Closed 6 years ago . char* stheParameterFileName = argv[1]; //I'm passing the file name as a parameter. TCHAR szName [512]; How can I convert char* to TCHAR [] ? 回答1: If you include the header file: #include "atlstr.h" Then you can use the A2T macro as below: // You'd need this line if using earlier versions of ATL/Visual Studio // USES_CONVERSION; char* stheParameterFileName = argv[1]; TCHAR szName [512];

问题 I'm trying to convert string to 'LPCTSTR', but, i got following error. Error : cannot convert from 'const char *' to 'LPCTSTR' code: std::string str = "helloworld"; LPCTSTR lp = str.c_str(); Also, tried : LPCTSTR lp = (LPCTSTR)str.c_str(); But, print garbage value. 回答1: LPCTSTR means (long pointer to constant TCHAR string). A TCHAR can either be wchar_t or char based on what your project settings are. If, in your project settings, in the "General" tab, your character set is "Use Multi-byte

问题 How can I input text into TCHAR* argv[] ? OR: How can I convert from char to TCHAR* argv[] ? char randcount[] = "Hello world"; TCHAR* argv[]; argv = convert(randcount); 回答1: One way to do is: char a[] = "Hello world"; USES_CONVERSION; TCHAR* b = A2T(a); 回答2: /*This code did TCHAR in my project without A2T or any other converters. Char text is a some kind of array. So we can take letters one by one and put them to TCHAR. */ #include <iostream> TCHAR* Converter(char* cha) { int aa = strlen(cha)

问题 how I can convert string to tchar in VC++? string internetprotocol="127.4.5.6"; TCHAR szProxyAddr[16]; i want to set: szProxyAddr=internetprotocol; how i can do it? 回答1: #include <atlstr.h> string internetprotocol="127.4.5.6"; TCHAR szProxyAddr[16]; _tcscpy_s(szProxyAddr, CA2T(internetprotocol.c_str())); _tcscpy_s is generic strcpy version which works both in Unicode and Multi-Character configurations. CA2T converts const char* to TCHAR* , according to szProxyAddr variable type. Be careful