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类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;
}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);
}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
}