VC 获取磁盘盘符剩余空间，CJSON格式输出_vc获取当前分区剩余量-优快云博客

本文链接：https://blog.youkuaiyun.com/changshiyzj/article/details/83036202

本文介绍了一个C语言函数，用于获取计算机上各磁盘分区的总空间和剩余空间，并使用cJSON库将数据转换为JSON格式输出。通过遍历所有可用的磁盘驱动器，函数调用GetDiskFreeSpaceEx函数来获取每个驱动器的磁盘信息。

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void GetPlace(char *datajson)
{
   ULARGE_INTEGER nFreeBytesAvailable;
ULARGE_INTEGER nTotalNumberOfBytes;
ULARGE_INTEGER nTotalNumberOfFreeBytes;
DWORD msg = 1;
   DWORD statue = 0;
WCHAR Drive[MAX_PATH] = {0};
   char ch[3] = "c";
   char FreePlace[1024] = {0};
   char TotalPlace[1024] = {0};
GetLogicalDriveStrings(MAX_PATH, Drive);
wstring myDrive = L"";
int i = 0;
   cJSON *root = cJSON_CreateObject();
   cJSON *FreeP = cJSON_CreateArray();
   cJSON *TotalP = cJSON_CreateArray();

while (Drive[i] != '\0' || Drive[i+1] != '\0')//搜索数组尝试得到盘符信息
{
myDrive = Drive[i];
   myDrive = myDrive + L":";
   i+= 4;
msg = GetDiskFreeSpaceEx(myDrive.c_str(),&nFreeBytesAvailable,&nTotalNumberOfBytes,&nTotalNumberOfFreeBytes);
       statue = GetLastError();
       if (msg)
       {
           cJSON *tempF = cJSON_CreateObject();
           cJSON *tempT = cJSON_CreateObject();
           double Totalspace = nTotalNumberOfBytes.QuadPart/1024./1024./1024.;//得到磁盘总空间，单位为G
           char get_Totalfree[50] = {0};
           sprintf(get_Totalfree,"%.2lf",Totalspace);
           cJSON_AddItemToObject(tempF,"disk",cJSON_CreateString(ch));
           cJSON_AddItemToObject(tempF,"vale",cJSON_CreateString(get_Totalfree));
           cJSON_AddItemToArray(FreeP,tempF);
           double Freespace = nTotalNumberOfFreeBytes.QuadPart/1024./1024./1024.;//得到磁盘剩余空间，单位为G
           char get_free[50] = {0};
           sprintf(get_free,"%.2lf",Freespace);
           cJSON_AddItemToObject(tempT,"disk",cJSON_CreateString(ch));
           cJSON_AddItemToObject(tempT,"vale",cJSON_CreateString(get_free));
           cJSON_AddItemToArray(TotalP,tempT);
       }
               ch[0]++;
   }
   char GetMsg[3] ={0};
   sprintf(GetMsg,"%d",msg);
cJSON_AddNumberToObject(root,"status:",statue);
   cJSON_AddStringToObject(root,"GetDiskMsg",GetMsg);

   cJSON_AddItemToObject(root,"FreePlace",FreeP);
   cJSON_AddItemToObject(root,"TotalPlace",TotalP);
   char getdataF[1024] = {0};
   strcpy(datajson ,cJSON_PrintUnformatted(root));
   cJSON_Delete(root);
   //cJSON_Print(root));
}

///////////////////////////////////////

输出：

{
"status:": 0,
"GetDiskMsg": "1",
"FreePlace": [{
"disk": "c",
"vale": "80.00"
}, {
"disk": "d",
"vale": "80.00"
}, {
"disk": "e",
"vale": "80.00"
}, {
"disk": "f",
"vale": "95.51"
}],
"TotalPlace": [{
"disk": "c",
"vale": "22.71"
}, {
"disk": "d",
"vale": "0.29"
}, {
"disk": "e",
"vale": "1.65"
}, {
"disk": "f",
"vale": "2.93"
}]
}