public function genSignature($aMerchantNo)
{
$tRequestMessage = null;
try {
$this->iLogWriter = new LogWriter();
$this->iLogWriter->logNewLine("TrustPayClient V3.0.0 交易开始==========================");
MerchantConfig::getLogWriterObject($this->iLogWriter);
//0、检查传入参数是否合法
if ($aMerchantNo <= 0 || $aMerchantNo > MerchantConfig::getMerchantNum()) {
throw new TrxException(TrxException::TRX_EXC_CODE_1008, TrxException::TRX_EXC_MSG_1008, '配置文件中商户数为' . MerchantConfig::getMerchantNum() . ", 但是请求指定的商户配置编号为{$aMerchantNo} ！");
}
//1、检查交易请求是否合法
$this->iLogWriter->logNewLine('检查交易请求是否合法：');
$this->checkRequest();
$this->iLogWriter->log('正确');
//2、取得交易报文
$tRequestMessage = $this->getRequestMessage();
//3、组成完整交易报文
$this->iLogWriter->log("完整交易报文：");
$tRequestMessage = $this->composeRequestMessage($aMerchantNo, $tRequestMessage);
$this->iLogWriter->log($tRequestMessage);
//4、对交易报文进行签名
$tRequestMessage = MerchantConfig::signMessage($aMerchantNo, $tRequestMessage);
$this->iLogWriter->log("签名后的完整报文：");
$this->iLogWriter->log($tRequestMessage);
$tRequestMessage = str_replace('"', """, $tRequestMessage);
} catch (TrxException $e) {
if ($this->iLogWriter != null) {
$this->iLogWriter->logNewLine('错误代码：[' . $e->getCode() . '] 错误信息：[' . $e->getMessage() . ']');
}
throw new TrxExCeption($e->getCode(), $e->getMessage() . " - " . $e->getDetailMessage());
} catch (Exception $e) {
if ($this->iLogWriter != null) {
$this->iLogWriter->logNewLine('错误代码：[' . TrxException::TRX_EXC_CODE_1999 . '] 错误信息：[' . TrxException::TRX_EXC_MSG_1999 . ' - ' . $e->getMessage() . ']');
}
throw new TrxExCeption(rxException::TRX_EXC_CODE_1999, TrxException::TRX_EXC_MSG_1999 . ' - ' . $e->getMessage());
}
if ($this->iLogWriter != null) {
$this->iLogWriter->logNewLine("交易结束==================================================\n\n\n\n");
$this->iLogWriter->closeWriter(MerchantConfig::getTrxLogFile());
}
return $tRequestMessage;
}