Hello,
My card is NI-IMAQ PCI-1405, and I am working in VC++2005.
When I SNAP a picture, there are data in "ImaqBuffer" pointer as I sent to the the function "imgSnap (Sid, (void **)&ImaqBuffer)".
I get the data and do some image processing, for example, flip image left to right, and I save the processed image in "temp" pointer.
and I want to show the processed image, so I let ImaqBuffer=temp, and delete the memory of old ImaqBuffer points to, there comes an error.
I dont know why I cant delete the useless memory?
here is the the part of my code:
void CIMGsnapDlg::flipLR(){
// Have the size as same as image in ImaqBuffer
char* temp;
temp= new char[AcqWinHeight*AcqWinWidth];
/***flip the image and save in temp***/
int index1;
int index2;
for(int i=0;i<AcqWinHeight;i++){
for(int j=0;j<AcqWinWidth;j++){
index1=i*AcqWinWidth+j;
index2=i*AcqWinWidth+(AcqWinWidth-j-1);
temp[index1]=*(ImaqBuffer+index2);
}
}
/************************************/
char* temp2=ImaqBuffer; // point to old memory of ImaqBuffer
ImaqBuffer=temp;
temp=NULL;
delete [] temp2; // delete the old memory of ImaqBuffer and here is the ERROR
OnPaint(); // show the processed image
}
Since the Function Reference Help about function: "rval imgGrab(SESSION_ID sid, void** bufAddr, uInt32 waitForNext)" mentions that if
bufAddr points to a NULL pointer, this call allocates a buffer, acquires an image, and returns the buffer address in the location specified by bufAddr.
the "ImaqBuffer" in my code is points to NULL before I sent to the function.
Is this anything connection about my error?
Thanks for help.
