当前位置: 首页>>代码示例>>C++>>正文


C++ std::fread方法代码示例

本文整理汇总了C++中std::fread方法的典型用法代码示例。如果您正苦于以下问题:C++ std::fread方法的具体用法?C++ std::fread怎么用?C++ std::fread使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在std的用法示例。


在下文中一共展示了std::fread方法的3个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: LoadResourceMap

bool CResourceMapAnalyzer::LoadResourceMap() {
	std::string map = GetCacheFileName();
	FILE* loadFile = fopen(map.c_str(), "rb");

	if (loadFile != NULL) {
		fread(&NumSpotsFound, sizeof(int), 1, loadFile);
		VectoredSpots.resize(NumSpotsFound);
		fread(&AverageIncome, sizeof(float), 1, loadFile);

		for (int i = 0; i < NumSpotsFound; i++) {
			fread(&VectoredSpots[i], sizeof(float3), 1, loadFile);
		}

		fclose(loadFile);
		return true;
	}

	return false;
}
开发者ID:DeadnightWarrior,项目名称:spring,代码行数:19,代码来源:ResourceMapAnalyzer.cpp

示例2: constructBlock

Block * SimulatedDisk::readBlock(Block::number n, Block::flushInterval i) {
    FILE * discoFofinho = fopen(fileName, "rb");
    fseek(discoFofinho, n * blockSize, SEEK_SET);

    unsigned char * data = new unsigned char[blockSize];

    fread(data, 1, blockSize, discoFofinho);
    fclose(discoFofinho);

    return Storage::constructBlock(data, blockSize, n, i);
}
开发者ID:royertiago,项目名称:INE5412-Filesystem,代码行数:11,代码来源:simulatedDisk.cpp

示例3: mem_usage

int mem_usage(double& vm_usage, double& resident_set) {

#ifdef _WIN32

    // Figure out if we're on WinNT
    OSVERSIONINFO osvi; 
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    GetVersionEx( &osvi );
    if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
        SIZE_T lpMinimumWorkingSetSize;
        SIZE_T lpMaximumWorkingSetSize;

        GetProcessWorkingSetSize(
            GetCurrentProcess(),
            &lpMinimumWorkingSetSize,
            &lpMaximumWorkingSetSize
        );

        vm_usage = (double)lpMinimumWorkingSetSize;
        resident_set = (double)lpMaximumWorkingSetSize;
    } else {
        return ERR_NOT_IMPLEMENTED;
    }
    return 0;
#else


#if HAVE_PROCFS_H && HAVE__PROC_SELF_PSINFO
    FILE* f;

    // guess that this is solaris
    // need psinfo_t from procfs.h
    //
    if ((f = fopen("/proc/self/psinfo", "r")) != 0) {
        psinfo_t psinfo;

        if (fread(&psinfo, sizeof(psinfo_t), 1, f) == 1) {
            vm_usage = psinfo.pr_size*1024.;
            resident_set = psinfo.pr_rssize*1024.;
            fclose(f);
            return 0;
        } else {
            fclose(f);
            return ERR_FREAD;
        }
    }
#endif

#if HAVE__PROC_SELF_STAT
    FILE* f;
    // guess that this is linux
    //
    if ((f = fopen("/proc/self/stat", "r")) != 0) {
        char buf[256];
        char* p;
        int i;
        unsigned long tmp;

        i = fread(buf, sizeof(char), 255, f);
        buf[i] = '\0'; // terminate string
        p = &buf[0];

        // skip over first 22 fields
        //
        for (i = 0; i < 22; ++i) {
            p = strchr(p, ' ');
            if (!p) break;
            ++p; // move past space
        }
        if (!p) {
            return ERR_NOT_IMPLEMENTED;
        }

        // read virtual memory size in bytes.
        //
        vm_usage = atof(p);
        p = strchr(p, ' ');

        // read resident set size: number of pages the process has in
        // real memory, minus 3 for administrative purposes.
        //
        tmp = strtol(p, 0, 0);
        resident_set = (double)(tmp + 3)*getpagesize();

        fclose(f);
        return 0;
    }
#endif

    return ERR_NOT_IMPLEMENTED;
#endif
}
开发者ID:nicolas17,项目名称:boincgit-test,代码行数:92,代码来源:mem_usage.cpp


注:本文中的std::fread方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。