Qt：无法对类型为"QProcess：:P rocessError"的参数进行排队 - QProcess：:P rocessError(FailedToStart)

我正在尝试将序列化图像传递给我在Qt程序中启动的进程。 但是，这样做时，我收到此错误消息：

QObject::connect: Cannot queue arguments of type 'QProcess::ProcessError'
(Make sure 'QProcess::ProcessError' is registered using qRegisterMetaType().)

我试图传递的图像是一个cv：：Mat，我将其转换为QImage，然后转换为QString。

有人可以告诉我在将参数流式传输到变量参数时我做错了什么吗？我目前的猜测是问题在于图像的序列化形式，即它包含许多双引号，这就是为什么在下面的行中插入 matQStr 的值(将其流式传输到参数(时，存在误解

其他一切正常，只是现在尝试传递图像时出现问题。

如果您可能需要此信息，我正在启动的过程是一个使用 openCV 的 python 函数，该函数采用 1 个参数，即我尝试传递的图像。 序列化图像以将其传递给函数，显然是最简单的解决方案。

代码：

double myClass::runPythonScrypt()
{
cv::Mat imageParameter = cv::imread("/home/John/Desktop/image1.jpg", CV_LOAD_IMAGE_COLOR);
QImage img((uchar*)imageParameter.data, imageParameter.cols, imageParameter.rows, imageParameter.step1(), QImage::Format_RGB32);
std::string matStdString(imageParameter.begin<unsigned char>(), imageParameter.end<unsigned char>());
QString matQStr = QString::fromStdString(matStdString);
QProcess p;
QStringList params;
connect(&p, &QProcess::errorOccurred, qApp, &QApplication::aboutQt );
int a=55;
//I added "this is the end in the string because in the beginning I thought maybe some overflow occured and therefor not the entire image was passed to the process, yet you can see that this sentence gets printed"
params<< "-c" << "import cv2; import imp; foo = imp.load_source('myTest', '/home/John/fw/demos/myTest.py'); from myTest import myClass; myClassObj = myClass(); print myClassObj.myTestFunction( "+ matQStr +" ) this isthe end;";

qDebug()<<params;
p.start("python2", params);
if(! p.waitForFinished(-1))
{qDebug()<<"it failedddd";}
qDebug()<<"error that occured: "<<p.error();
QString errors = p.readAllStandardError();
qDebug()<<"occured errors:"<<errors;
QString p_stdout = p.readAllStandardOutput();

...
}

生成的输出：

started recognition thread
("-c", "import cv2; import imp; foo = imp.load_source('myTest', '/home/John/fw/demos/myTest.py'); from myTest import myClass; myClassObj = myClass(); print myClassObj.myTestFunction(
...etc...
����������������������Ѧ����<u0013u001Bu0014�������������������������������������������������������������������
����������������������������������������������������������������������u0011u0017u0005b=
*u0007u0005u0016=/"6=;<@@;;>AA@:311373//+1HcVFPsu007FeH?zu007FBY�f\�oJV��������������������t?
>K\`RJMTY`a[RSWQMJECBDDIEEEJKN
KJGJHF>@AGFHDC=<89:AA<0/4*%%+/../+##.657>9;=@BBBA@A@><:9<?@@?>?BB;;:88:;<>;;;>>=<;<@@>=<<<;:::;;<998:7337:;<;:
88955555677;;956:954578887879::8533146764441/./0110/--0563/1220./2665420/011222147;FEA>?>;8>=<BGG;04,,-%$&$ ")0
1./3332/,))++)),.)
etc...
10210.,,,-.-/12/*'',-023432-%#')')/04;94:<3.).51/1.((*.10,'1/23547702.0%#0+114; ) this isthe end;")
started recognition thread
QObject::connect: Cannot queue arguments of type 'QProcess::ProcessError'
(Make sure 'QProcess::ProcessError' is registered using qRegisterMetaType().)
it failedddd
error that occured:  QProcess::ProcessError(FailedToStart)
occured errors: ""
name:  ""
certitude:  0
return value:  0
2

编辑：

使用的 python 脚本：

#!/usr/bin/env python2
import cv2
import os
import numpy as np

class myClass:
def __init__(self): pass
def myTestfunction2(self):     
image= cv2.imread("/home/John/Desktop/image1.jpg")
cv2.imshow("image", image)
def myTestFunction(self, a):
print('my test function showing passed image as parameter')
cv2.imshow('a', a)        
cv2.waitKey(0)
return ('John', a)

请注意，这一行，用于流式传输参数而不是我软件中当前存在的参数，工作得很好：

params<< "-c" << "import cv2; import imp; foo = imp.load_source('myTest', '/home/John/fw/demos/myTest.py'); from myTest import myClass; myClassObj = myClass(); print myClassObj.myTestFunction(cv2.imread('/home/John/Desktop/image1.jpg'));";

但它并没有完全满足我的需要，我需要传递一个 cpp 变量而不是使用 cv2.imread((