希望高人指导POS系统开钱箱的问题，谢谢！(200)

使用StarTsp143U热敏打印机，USB接口，开箱的代码是ASCII 7。使用以下C++Builder代码：(打印机使用USBkou端口：USB002)HANDLE hwndFile;DWORD written;unsigned char ch;hwndFile = CreateFile("USB002",GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);ch = 0x07;WriteFile(hwndFile,&ch,1,&written,NULL);CloseHandle(hwndFile);运行不能打开钱箱。

· Call SetupDiGetClassDevs(interface_guid, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE) to get a list of devices. · Call SetupDiEnumDeviceInterfaces() to get a list of available device interfaces. · Call SetupDiGetDeviceInterfaceDetail() to fetch information for the actual device interface we are going to use. · Use the DevicePath member of the PSP_DEVICE_INTERFACE_DETAIL_DATA structure returned by the SetupDiGetDeviceInterfaceDetail() call as the devicename/filename in the CreateFile() call. · Call WriteFile() repeatedly to send data to the device. · Call CloseHandle() to close the device

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