QT打印PDF

       QPrinter printer;

       QPrintDialog printDialog(&printer);

       if(printDialog.exec())

       {

              QString qstrPrinterName = printer.printerName();

              memset(szBufferDefaultPrinterName,0,256);

              DWORD length = 256;

              GetDefaultPrinter(szBufferDefaultPrinterName,&length);

 

              SetDefaultPrinter(qstrPrinterName.toStdString().c_str());

 

              const ushort* pdfPath = qstrPDFPath.utf16();

              ShellExecuteW(NULL,L"print",pdfPath,NULL,NULL,SW_SHOW);

 

              SetDefaultPrinter(szBufferDefaultPrinterName);

       }

注：

标准库的std::string转换成LPCSTR很简单：直接调用c_str()即可。例：
std::string a="abc"; 
LPCSTR str = a.c_str();

标准库还有一个wstring，代表宽字符的string，std::wstring转换成LPCWSTR也一样很简单：
std::wstring a = L"abc";
LPCWSTR str = a.c_str();