所以在一些Arduino代码中我Serial.print有几个这样的数字（var1=##,var2=##,var3=##）。我有一个C ++ DLL，我正在制作这个信息并将其解析为一个变体数组，如此（"var1=",##.##,"var2=",##.##,"var3=",##.##）将字符串部分存储为变体BSTR，将#存储为变体双精度存储。这个变种数组来自Excel，我的C ++ DLL的目的是允许与Excel和Arduino板进行串行通信。
我的问题是，不是像我想的那样得到信息，而是在最后得到了很多额外的胡言乱语，并且无法弄清楚它来自哪里。我之前包含了我的相关代码，遗漏了串行通信，因为我知道那部分是可行的。现在，Arduino代码只是发送（##,##,##）然后Serial.println();来简化事情，因为没有字符串，只有数字。
VBA代码：
'collects all rows available currently up to 1000(global numRows) lines each time, stores result in dataArray
Public Function getAllData()
Dim stringArray() As Variant
Dim variantArray() As Variant
ReDim stringArray(0 To 3000) As Variant
ReDim variantArray(0 To 3000) As Variant
If Main.dataCollectionActive Then
Dim staringDataRow As Integer
staringDataRow = currentDataRow
Dim returnValue As Long
returnValue = GetAllDataTypes(stringArray(), variantArray(), currentDataRow)
If Not (returnValue = 0) Then
If Not (returnValue = -1) Then
If printWhileCollectingData = True Then
' Call printVariantData
Dim row As Integer
Dim col As Integer
For row = startingDataRow To (currentDataRow - 1)
Main.dataBox.Text = Main.dataBox.Text & stringArray(row)
For col = 0 To (getNumColumns() - 1)
Main.Cells(row + startingRow, col + startingCol).Value = variantArray(col + (row * getNumColumns()))
Next col
Next row
End If
End If
End If
'only stoped in Main sheets code for stopDataButton or if the array has reached its limit
If Not ((currentDataRow * getNumColumns) = UBound(variantArray())) Then
Application.OnTime Now + TimeValue("00:00:01"), "getAllData"
End If
Main.Range("$L$4").Value = currentDataRow
End If
End Function
C ++ DLL代码：
//end1 comes before end2, so end1 = i-1 and end2 = i characters
DLL_EXPORT bool WINAPI isEndLine(char end1, char end2){
//check for CRLF
if (end1 == '\r') {
if (end2 == '\n') {
return true;
}
}
//check for normal endLine \0
else if ((end1 == '\0')) {
return true;
}
//check for users own endLine character
else{
for(int i = 0; i < MAX_ENDLINE_LENGTH; i++){
if (end1 == endLine[i]){
return true;
}
}
}
return false;
}
//reads a single character from buffer, if there is nothing returned then the global, bufferAvailable is set to false, so that no more characters are asked for, for now
DLL_EXPORT char WINAPI readCharFromSerial() {
char dataChar[1];
DWORD dwBytesRead = 0; //number of data bytes read in
if(!ReadFile(hSerial, dataChar, 1, &dwBytesRead, NULL)) { //gets data if successful, if not then notifies user
ErrorExit("ReadFile, reading a character");
}
if (dwBytesRead == 0) {
bufferAvailable = false;
}
return dataChar[0]; //returns read in data
}
//reads a single line by pulling one character at a time until it finds the end of line character, if the buffer has characters in it
DLL_EXPORT void WINAPI readLineFromSerialPort(char* line, int length) {
bufferAvailable = true;
int i = 0;
line[i] = readCharFromSerial();
i++;
if (bufferAvailable){
do{
line[i] = readCharFromSerial();
i++;
}while((!isEndLine(line[i-2], line[i-1])) && (i < length));
if(line[i-2] == '\r') {
line[i-2] = '\n';
line[i-1] = '\0';
}
if(!(i<length)){
MessageBoxA(NULL, (LPCSTR)("string length not long enough"), TEXT("readLineFromSerialPort"), MB_OK);
}
}
}
DLL_EXPORT void WINAPI PlaceDblInVarDbl(varArr* VD, double data) {
(VD->ptr[VD->index]).vt = VT_R8; //FIXME add function to do this
(VD->ptr[VD->index]).dblVal = data;
VD->index++;
}
DLL_EXPORT void WINAPI PlaceCharPtrInVarBstr(varArr* VD, char* cString) {
BSTR bstr = new OLECHAR[MAX_DATA_LENGTH];
const char* Cstring = (const char*)cString;
mbstowcs(bstr, Cstring, MAX_DATA_LENGTH);
VD->ptr[VD->index].vt = VT_BSTR;
SysReAllocString(&((VD->ptr[VD->index]).bstrVal), bstr);
VD->index++;
}
DLL_EXPORT int WINAPI ParseCharPtrToVarBstrAndVarDbl(varArr* VD, char* dataString) {
//FIXME perhaps make an array of chars for strings that are allowed without being coppied, this would be added to the if begging with !isdigit (like the '.')
bool hasLetters = false;
int endIndex = 0;
int startIndex = 0;
// MessageBoxA(NULL, (LPCSTR)("entered"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
while (!(isEndLine(dataString[endIndex], dataString[endIndex+1]))) {
hasLetters = false;
startIndex = endIndex;
while (!isDelim(dataString[endIndex]) && (!(isEndLine(dataString[endIndex-1], dataString[endIndex])))) {
if (!(isdigit(dataString[endIndex])) && !(dataString[endIndex] == ' ') && !(dataString[endIndex] == '.')) {
hasLetters = true;
}
endIndex++;
}
// MessageBoxA(NULL, (LPCSTR)("delimeter found"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
if((startIndex + 1 == endIndex) || (startIndex == endIndex)/* && !(isEndLine(dataString[endIndex-1], dataString[endIndex]))*/) {
//FIXME odd way to fix CRLF problem
// MessageBoxA(NULL, (LPCSTR)("triggered if"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
}
else if (hasLetters) { //string
char smallerString[MAX_DATA_LENGTH];
const char* DStr = (const char*)(&(dataString[startIndex]));
strncpy(smallerString, DStr, endIndex-startIndex+1);
smallerString[endIndex-startIndex+1] = '\0';
PlaceCharPtrInVarBstr(VD, smallerString);
// MessageBoxA(NULL, (LPCSTR)("triggered hasLetters"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
}
else { //double
//FIXME remove whitespace
char* start = &dataString[startIndex];
char* eOS = &(dataString[endIndex]);
char** endOfString = &eOS;
double data = strtod(start, endOfString);
//FIXME do some error checking
PlaceDblInVarDbl(VD, data);
// MessageBoxA(NULL, (LPCSTR)("triggered does not hasLetters"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
}
endIndex++;
}
//, MessageBoxA(NULL, (LPCSTR)("exited"), TEXT("ParseCharPtrToVarBstrAndVarDbl"), MB_OK);
return VD->startingIndex - VD->index;
}
//first read a lines from the serial port and then parse it into dataArray, does this until there is no data in buffer or array is full
//returns how many rows that it read
DLL_EXPORT int WINAPI GetAllDataTypes(LPSAFEARRAY* unparsedData, LPSAFEARRAY* parsedData, int* currentDataRow) {
bufferAvailable = true;
varArr UPD;
OpenVariantSafeArray(&UPD, unparsedData, *currentDataRow); if (UPD.failed) { return -1; }
varArr PD;
OpenVariantSafeArray(&PD, parsedData, *currentDataRow); if (PD.failed) { return -1; }
while (bufferAvailable && ((PD.index + 10) < PD.uBound)) {
char dataString[MAX_DATA_LENGTH];
readLineFromSerialPort(dataString, MAX_DATA_LENGTH);
if (bufferAvailable) {
PlaceCharPtrInVarBstr(&UPD, dataString);
ParseCharPtrToVarBstrAndVarDbl(&PD, dataString);
}
}
CloseVariantSafeArray(&UPD, unparsedData); if (UPD.failed) { return -1; }
CloseVariantSafeArray(&PD, parsedData); if (PD.failed) { return -1; }
*currentDataRow += UPD.index - UPD.startingIndex;
bufferAvailable = true;
return UPD.index - UPD.startingIndex;
}
结果错误：
这是在Excel中的文本框中打印时返回的未解析的String。
0.00,0.01,0.00 0.10,0.02,0.01 0.20,0.03,0.02 0.30,0.04,0.03 0.40,0.05,0.04 0.50,0.06,0.05 0.60,0.07,0.06 0.70,0.08,0.07 0.80,0.09,0.08 0.90,0.10,0.09 1.00,0.10,0.10
然而，由VBA for循环在单元格中打印的已解析字符串。还有随机字符。似乎我在DLL中解析有问题，因为最后一个double总是最终成为一个字符串，然后它总是随机字符串。
0.000 0.010 "0.00 " - 0.100 0.020 "0.01 " - 0.200 0.030 "0.02 " - 0.300 0.040 "0.03 " - 0.400 0.050 0.900 0.100 "0.09 " - 0.000 0.100 "0.10 " - 0.100 0.110 "0.11 " - 0.200 0.120 "0.12 " - 0.300 0.130 "0.13 " - 0.400 0.140 "0.14 " - 0.500 0.150 "0.15 " - 0.600 0.160 "0.16 " - "0.25 " - 0.600 0.240 "0.26 " - 0.700 0.250 "0.27 " -
答案 0 :(得分：0)
DLL代码中的ParseCharPtrToVarBstrAndVarDbl（）中的最终endIndex ++，用于跳过在字符串中跳过空终止符的分隔符。修复是为字符串结尾添加最后的if语句，如果是，则返回。