本文整理汇总了C++中SdBaseFile::seekSet方法的典型用法代码示例。如果您正苦于以下问题：C++ SdBaseFile::seekSet方法的具体用法？C++ SdBaseFile::seekSet怎么用？C++ SdBaseFile::seekSet使用的例子？那么, 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SdBaseFile的用法示例。
在下文中一共展示了SdBaseFile::seekSet方法的2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: parsejson
void CardReader::parsejson(SdBaseFile &file) {
fileSize = file.fileSize();
filamentNeeded = 0.0;
objectHeight = 0.0;
firstlayerHeight = 0.0;
layerHeight = 0.0;
if (!file.isOpen()) return;
bool genByFound = false, firstlayerHeightFound = false, layerHeightFound = false, filamentNeedFound = false;
#if CPU_ARCH==ARCH_AVR
#define GCI_BUF_SIZE 120
#else
#define GCI_BUF_SIZE 1024
#endif
// READ 4KB FROM THE BEGINNING
char buf[GCI_BUF_SIZE];
for (int i = 0; i < 4096; i += GCI_BUF_SIZE - 50) {
if(!file.seekSet(i)) break;
file.read(buf, GCI_BUF_SIZE);
if (!genByFound && findGeneratedBy(buf, generatedBy)) genByFound = true;
if (!firstlayerHeightFound && findFirstLayerHeight(buf, firstlayerHeight)) firstlayerHeightFound = true;
if (!layerHeightFound && findLayerHeight(buf, layerHeight)) layerHeightFound = true;
if (!filamentNeedFound && findFilamentNeed(buf, filamentNeeded)) filamentNeedFound = true;
if(genByFound && layerHeightFound && filamentNeedFound) goto get_objectHeight;
}
// READ 4KB FROM END
for (int i = 0; i < 4096; i += GCI_BUF_SIZE - 50) {
if(!file.seekEnd(-4096 + i)) break;
file.read(buf, GCI_BUF_SIZE);
if (!genByFound && findGeneratedBy(buf, generatedBy)) genByFound = true;
if (!firstlayerHeightFound && findFirstLayerHeight(buf, firstlayerHeight)) firstlayerHeightFound = true;
if (!layerHeightFound && findLayerHeight(buf, layerHeight)) layerHeightFound = true;
if (!filamentNeedFound && findFilamentNeed(buf, filamentNeeded)) filamentNeedFound = true;
if(genByFound && layerHeightFound && filamentNeedFound) goto get_objectHeight;
}
get_objectHeight:
// MOVE FROM END UP IN 1KB BLOCKS UP TO 30KB
for (int i = GCI_BUF_SIZE; i < 30000; i += GCI_BUF_SIZE - 50) {
if(!file.seekEnd(-i)) break;
file.read(buf, GCI_BUF_SIZE);
if (findTotalHeight(buf, objectHeight)) break;
}
file.seekSet(0);
}示例2: readLine
//int8_t IniFile::readLine(SdBaseFile &file, char *buffer, size_t len, uint32_t &pos)
IniFile::error_t IniFile::readLine(SdBaseFile &file, char *buffer, size_t len, uint32_t &pos)
{
if (!file.isOpen())
return errorFileNotOpen;
if (len < 3)
return errorBufferTooSmall;
if (!file.seekSet(pos))
return errorSeekError;
size_t bytesRead = file.read(buffer, len);
if (!bytesRead) {
buffer[0] = '\0';
//return 1; // done
return errorEndOfFile;
}
for (size_t i = 0; i < bytesRead && i < len-1; ++i) {
// Test for '\n' with optional '\r' too
// if (endOfLineTest(buffer, len, i, '\n', '\r')
if (buffer[i] == '\n' || buffer[i] == '\r') {
char match = buffer[i];
char otherNewline = (match == '\n' ? '\r' : '\n');
// end of line, discard any trailing character of the other sort
// of newline
buffer[i] = '\0';
if (buffer[i+1] == otherNewline)
++i;
pos += (i + 1); // skip past newline(s)
//return (i+1 == bytesRead && !file.available());
return errorNoError;
}
}
if (!file.available()) {
// end of file without a newline
buffer[bytesRead] = '\0';
// return 1; //done
return errorEndOfFile;
}
buffer[len-1] = '\0'; // terminate the string
return errorBufferTooSmall;
}