TaskDialogIndirect displays chinese text on expanded form

Question

Hi, I'm having a problem with TaskDialogIndirect displaying chinese text on the footer when expanding the control (i use TDF_EXPAND_FOOTER_AREA)

Code:

#include <commctrl.h>
#pragma comment(lib, "comctl32.lib")

#if defined _M_IX86
#pragma comment(linker, "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'\"")
#elif defined _M_IA64
#pragma comment(linker, "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='ia64' publicKeyToken='6595b64144ccf1df' language='*'\"")
#elif defined _M_X64
#pragma comment(linker, "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language='*'\"")
#else

char buf[9];
                sprintf(&buf[0], "%08x", (int)GetLastError());
                std::string res(&buf[0]);
                DWORD le = GetLastError();
                std::string message = (std::string)"APC Administrative Application Execution Utility encountured an error of code 0x" + res + ": " + "\"" + std::system_category().message(GetLastError()); +"\"";
                int lastError = GetLastError();
                std::wstring hexerror = L"0x" + WCHAR(DecToHex(GetLastError()));
                const char* HEs = message.c_str();
                _TASKDIALOGCONFIG tdc = { sizeof(_TASKDIALOGCONFIG) };
                TASKDIALOG_BUTTON buttons[] = {
                    { 1000, L"&Accept" },
                    { 1001, L"&Close" }
                };
                LPCWSTR szTitle = L"APC Administrative Application Execution Utility";
                LPCWSTR szHeader = L"An error has occured";
                LPCWSTR szBodyText = L"APC Administrative Application Execution Utility encountured an error, verify input to make sure it's correct";;
                int btc;
                tdc.pszExpandedInformation = (LPCWSTR)message.c_str();
                tdc.pszMainIcon = IDI_ERROR;
                tdc.hwndParent = hWnd;
                tdc.dwFlags = TDF_CAN_BE_MINIMIZED | TDF_ALLOW_DIALOG_CANCELLATION | TDF_EXPAND_FOOTER_AREA;
                tdc.cButtons = _countof(buttons);
                tdc.pButtons = buttons;
                tdc.pszWindowTitle = szTitle;
                tdc.pszMainInstruction = szHeader;
                tdc.pszContent = szBodyText;

                TaskDialogIndirect(&tdc, &btc, NULL, NULL);

Which results in the following (that code is in this block:

if (GetLastError() != 0) {
// the code
}

Images:

Expanded state (the problem):

How do I solve this?

Answer 1

You cannot cast narrow strings to LPCWSTR. Instead of using std::string use std::wstring for your message variable. And use a UNICODE string literal when initializing it.

Answer 2

You've got a cast here that's a red-herring:
tdc.pszExpandedInformation = (LPCWSTR)message.c_str();

Remove the cast (remove them all ideally), change message to be std::wstring and alter code appropriately.

Answer 3

You can cast narrow types to LPCWSTR (wide) you can put a narroiw thing in a wide thing