我收到此错误消息:



这是我的包括:

#include "stdafx.h"
#include "HSMBTPrintX.h"
#include "HSMBTPrintXCtrl.h"
#include "HSMBTPrintXPropPage.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#endif

这是我的功能:
#define MSS_PORTS_BASE _T("Software\\Microsoft\\Bluetooth\\Serial\\Ports")
bool FindBluetoothPort(TCHAR name[16]) {
    HKEY hKey, hRoot;
    TCHAR szPort[20] = _T(""), szPortString[20];
    DWORD len, dwIndex=0;
    bool bFound=false;
    INT i = 0, rc;
    DWORD dwNSize;
    DWORD dwCSize;
    TCHAR szClass[256];
    TCHAR szName[MAX_PATH];
    FILETIME ft;
    hRoot = HKEY_LOCAL_MACHINE;
    if (RegOpenKeyEx (hRoot, MSS_PORTS_BASE, 0, 0, &hKey) != ERROR_SUCCESS) {
        rc = GetLastError();
        return 0;
    }
    dwNSize = dim(szName);    <---- ~~ !! HERE IS THE LINE THAT ERRORS
    dwCSize = dim(szClass);     <---- HERE IS THE LINE THAT ERRORS  !!
    rc = RegEnumKeyEx (hKey, i, szName, &dwNSize, NULL, szClass, &dwCSize, &ft);
    while (rc == ERROR_SUCCESS)
    {
        // how many children
        TCHAR szCurrentKey[MAX_PATH];
        wcscpy(szCurrentKey, MSS_PORTS_BASE);
        wcscat(szCurrentKey, TEXT("\\"));
        wcscat(szCurrentKey, szName);
        wcscat(szCurrentKey, TEXT("\\"));
        len = sizeof(szPort);
        if(RegGetValue(hRoot, szCurrentKey, _T("Port"), NULL, (LPBYTE)szPort, &len)) {
            wsprintf(szPortString, _T("%s:"), szPort);
            bFound = true;
            break;
        }
        dwNSize = dim(szName);
        rc = RegEnumKeyEx(hKey, ++i, szName, &dwNSize, NULL, NULL, 0, &ft);
    }

    if(bFound)
        _tcscpy(name, szPortString);

    return bFound;
}

如您所见,使用此代码的两行是:
dwNSize = dim(szName);

dwCSize = dim(szClass);

为什么会出错?

最佳答案

看来您要使用sizeof:

dwNSize = sizeof(szName);
dwCSize = sizeof(szClass);
sizeof返回对象/变量的字节数。但是,我只是看了API RegEnumKeyEx的文档,它需要字符数。因此,我认为它实际上应该除以TCHAR的大小(根据您是针对Unicode构建的,大小为1或2)。
dwNSize = sizeof(szName) / sizeof(TCHAR);
dwCSize = sizeof(szClass) / sizeof(TCHAR);

关于c++ - 'dim':找不到标识符,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/6822681/

10-15 05:48