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Guest Patrick_Waugh

FLOAT64 to wstring

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When you use some code like this: FLOAT64 freq; execute_calculator_code("(A:ADF STANDBY FREQUENCY:1, KHz)", &freq, NULL, NULL);to read the ADF freq, what are you then doing to get it into text?If the ADF is tuned to say 315.0, what is in the FLOAT64?

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Patrick, the benefit of using this method to fetch the ADF frequency is that the return is in KHz, and therefore needs no BCD to DEC conversion... ;)Here is a code segment from my Honewell RTU, which features 2 ADF memory slots.fron the Honeywell_RTU.h file, the variables used://////////////////////////////////////////FLOAT64 adf1_frequency = 0;FLOAT64 ADF_MemA = 0;FLOAT64 ADF_MemB = 500; // defaults to 500 KHz???bool AdfFlag = false;int adf1_freq_high_carry = 0;//////////////////////////////////////////from the functions.cpp file:execute_calculator_code("(A:ADF ACTIVE FREQUENCY:1, KHz)",&adf1_frequency,NULL,NULL);if (AdfFlag == false) { ADF_MemA = adf1_frequency; }if (AdfFlag == true) { ADF_MemB = adf1_frequency; }char cString[8] = ""; sprintf(cString, "%07.2f", adf1_frequency); // since the character "0" is ascii code 48, // then subtracting 48 from the character code of // the desired character gives us the numeric equivalent. adf1_freq_high_carry = cString[2] - 48;//////////////////////////////////////////and, in case you're wondering what the devil the adf1_freq_high_carry is used for, here's a snip from the Honeywell_RTU_MouseFunctions.cpp file. This allows my "universal knob" to keep track of the decimal rollover:////////////////////////////////////////// if ( ( pagebutton == 1 && Pg1SelectCurs == 9 && dimbutton == 0 ) || ( pagebutton == 8 && Pg8SelectCurs == 7 && dimbutton == 0 ) ) { if (rtuthousandsknob == 1) { trigger_key_event (KEY_ADF_10_INC,0); if (adf1_freq_high_carry == 9) { trigger_key_event(KEY_ADF_100_INC,0); } rtuthousandsknob = 0; PageTimer = 0; } if (rtuthousandsknob == -1) { trigger_key_event (KEY_ADF_10_DEC,0); if (adf1_freq_high_carry == 0) { trigger_key_event(KEY_ADF_100_DEC,0); } rtuthousandsknob = 0; PageTimer = 0; } }

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Paradoxically, I don't mind the BCD stuff. =)But, I can't get at the ADF freq's without the XML vars, so I'm stuck trying to use that method.I'll try this:wstring RadioPage::GetAdf1Active(){ FLOAT64 freq; WCHAR freqStr[8] = {0}; execute_calculator_code("(A:ADF ACTIVE FREQUENCY:1, KHz)", &freq, NULL, NULL); swprintf_s(freqStr, 8, L"%07.2f", freq); return freqStr;}For the COM freq's I'm using this:wstring RadioPage::GetCom1Active(){ lookup_var(&m_com_frequency); lookup_var(&m_com_radio_25_khz_tunable); UINT32 bcd = m_com_frequency.var_value.d; m_Com1Freq[0] = '1'; m_Com1Freq[1] = ((bcd >> 12) & 0xF) + 0x30; m_Com1Freq[2] = ((bcd >> 8) & 0xF) + 0x30; m_Com1Freq[3] = '.'; m_Com1Freq[4] = ((bcd >> 4) & 0xF) + 0x30; m_Com1Freq[5] = ((bcd) & 0xF) + 0x30; if(m_Com1Freq[5] == '2' || m_Com1Freq[5] == '7') { m_Com1Freq[6] = '5'; m_Com1Freq[7] = '0'; // NULL Terminator } else { m_Com1Freq[6] = '0'; // NULL Terminator } m_Com1Freq[7] = '0'; // NULL Terminator wstring wstr = m_Com1Freq; return wstr;}Which is fine. Sometime I'll profile the alternate method and see which is faster.

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