Visual C++ :: Memcpy Error In MFC
Jun 19, 2013
I load an image(768*256) using a file path(OpenImageFilePath).
After load an image, I start to read the loaded Image data using GetBits method and plot the same image data(768*256).
I'm using the memcpy method, for that i'm getting the below error. memmove function also giving the same error message.
File Name : memcopy.asm
rep movsd ;N - move all of our dwords
Code for your reference
Code:
void CDlg :: FileOpen() {
CFileException CFileEx;
CStdioFile ReadFile;
// szFilters is a text string that includes two file name filters:
TCHAR szFilters[]= _T("Image Files (*.bmp)");
[code]....
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Feb 13, 2014
I am trying to add data to a queue with the following simplified code:
Code:
typedef struct Queue {
void * data;
int head;
int tail;
int elementSize;
My question is, how do I move the queue->data pointer to the correct memory location in order to copy given data to head? The code above inside memcpy gives med the error: "expression must be a pointer to a complete object type".
Do I need an extra pointer to be able to navigate between the queue's head and tail, and keep queue->data as a reference to the first byte of the allocated memory, or is it possible with only queue->data?
Edit. Just noticed I have mixed up head and tail. The enqueued data should probably go to the Queue's tail and not the head. However, the problem is still the same.
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Apr 26, 2012
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/libstdc++.so: undefined reference to `memcpy@GLIBC_2.14'
Why is this happening and how do I fix it? I installed g++ with rpms, and all of the dependencies were handled.
glibc-headers-2.5-34
glibc-devel-2.5-34
libstdc++-devel-4.1.2-44
gcc-4.1.2-44
gcc-c++-4.1.2-44
I don't understand how memcpy can't be there, it's been standard for 40 years. And I'm not using memcpy in my code, it's likely coming from one of the STL containers I use.
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Jul 21, 2013
Code:
#include<stdio.h>
#include<string.h>
int main(void) {
char str[20] = "HELLOSIR";
memcpy( str + 2 , str + 1 , 4 );
puts( str );
return 0;
}
If I have understood well the above code can be a typical example that decribes a memory overlap. Some of data to the destination (str + 2 ) will be copied before its copy.
Code: void *memcpy( void * restrict s1, const void * restrict s2, size_t n );
According to the above example I think there is no quarantee even the restrict to the pointer that we won't have overlap.It is legal to use the same pointer and not other in order to have access on the data.So for this the behaviour is not undefined right?
But how memcpy works? I mean I am taking
Code: HEELLOIR as output rather than
Code: HEEEEEIR So the behaviour due to overlap is undefined?
The const on const void * restrict s2 denotes that data can't change from s2 itself?
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Nov 6, 2013
Despite seeing the correct data in gdb when I
Code:
p *(DownloadFileChunkResponse.DownloadFileChunkResult)->__ptr@100
The following C code gives me a SEG FAULT
Code:
calloc(NewMediaChunk, ChunkSize);
memcpy((void *)NewMediaChunk,
*(DownloadFileChunkResponse.DownloadFileChunkResult)->__ptr, ChunkSize);
How I got this wrong. BTW The data I am attempting to memcpy is the frontend of an MP4 file containing a number of NULLS.
Code: 00 00 00 30ftypmp42 00 00 00 00mp42mp41 00 00 dfree
BTW ChunkSize is 64000
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Aug 19, 2014
I am just getting back in to C++ after 10 years not doing any, contributing to an open source project. I'm adding in some functionality and am hitting a road block.
I need to send a multicast packet out on the network that is structured in a certain way. I have the definition, and know what data is going in each byte. I can successfully send a message using multicast, I now just need to send the right message.
I have used a char array to hold the message, as each char represents 1 byte, and I can transmit the array.
I am having trouble putting all of the data in the right place though. If my source data is a string, then I seem to be able to convert it, but if it is a short or int, then I keep getting errors when compiling. Similarly, two of the lines, (version and type) i initially tried using char arrays with a length of one.
Should I be using memcpy or a different function, or even be doing this in a totally different way altogether? This is the code that I am using, along with the packet structure:
//Construct a Zone Query packet
// 4 bytes - Signature "Ohz " = 0x6f, 0x68, 0x7a, 0x20
// 1 bytes - Version = 1
// 1 bytes - Type (0 = Zone Query, 1 = Zone Uri)
// 2 bytes - Entire message length = 12 + zone length
// 4 bytes - Length in bytes of the zone ID
// n bytes - Zone ID to query
[Code] ....
The errors that I get are:
error: invalid conversion from ‘short int’ to ‘const void*’ [-fpermissive]
memcpy(buffer + 6, packetLength, sizeof(packetLength));
^
[Code] ....
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Jan 2, 2013
on a customers pc I have the following problem:
I want to run an exe file with CreateProcess, but this generates the error 193 which means
ERROR_BAD_EXE_FORMAT
%1 is not a valid Win32 application.
This is strange because there are no known problems with this file before for many years on many different windows versions.
The customers uses win7/32.
I use it with win xp and win7/64.
The file was compiled with vc 6.0.
What can cause this problem?
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Jul 21, 2013
I have a vc++ project file which reads data from access 2007 database.
I have successfully declared and opened connectionPtr and recordSetPtr objects.
The follwoing code is giving an error message that "item cannot be found in the collection"
stringVar = (recordSet->Fields->GetItem("[String]")->GetValue()).bstrVal;
If i replace "[String]" with "String" then above statement executed successfully.
How can i execute the above statement with "[String]" without errors?
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Feb 3, 2014
I have a problem with ReadFile and overlapped.
first I use ReadFile with overlapped with 0
Code:
ZeroMemory(&overlapped ,sizeof(OVERLAPPED));
hDevice = CreateFileW(zwpath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
if(hDevice != INVALID_HANDLE_VALUE){
[Code]....
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May 28, 2013
Here is the error I am getting:
1>d: estprojectgdiplusrenderer.h(61): error C2872: 'Font' : ambiguous symbol
1> could be 'c:program files (x86)microsoft visual studio 10.0vcincludecomdef.h(312) : Font'
1> or 'c:program files (x86)microsoft sdkswindowsv7.0aincludegdiplusheaders.h(244) : Gdiplus::Font'
How can I fix this issue?
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Jan 28, 2013
The following code it taken from msdn library but it is failing to compile.
the following code has a header where all the variables used here are stored in header App.h.
The following lines are giving trouble:
Code:
DialogBox(pApp->getInstance(), MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, pApp->About);
error: 'App::About': function call missing argument list; use '&App::About' to create a pointer to member
Code:
wcex.lpfnWndProc= &App::WndProc;
error: '=' : cannot convert from 'LRESULT (__stdcall App::* )(HWND,UINT,WPARAM,LPARAM)' to 'WNDPROC'
There is no context in which this conversion is possible
Here is the complete code:
#include "stdafx.h"
#include "App.h"
App::App(void) {
}
App::~App(void) {
[Code] .....
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Mar 11, 2013
I am working through these tutorials:
[URL]
I haven't had to modify them much for VS2010 so far. Right now, (I think) I have created the dialog box, and the menu as a class and a resource, respectively. However, when I call
Code:
void MFC_Tutorial_Window::OnClickDialogNew()
{
NewDialog dlg;
dlg.DoModal();
}
I get an error 'DoModal' : is not a member of 'NewDialog'
I suppose somehow I need to link the menu to the dialog box?
I believe I've added the references, included the libraries and essentially followed the instructions. Apparently I'm not very clear on how to make resources interact with new classes.
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Aug 23, 2014
I have this code in my project
Code:
// OpenGL1.cpp : main project file.
// #include "stdafx.h"
#include "windows.h"
#include <GL/gl.h>
[Code] ....
and I got this error:
Configuration: Debug Win32 ------
1> OpenGL1.cpp
1>LINK : fatal error LNK1104: cannot open file 'C:Program FilesMicrosoft SDKsWindowsv7.0AIncludegl.obj'
Why it wants the gl.obj and how to make this code working without error?
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Sep 22, 2013
I am getting an error...
Error1error C2109: subscript requires array or pointer type451
PHP Code:
#include "stdafx.h"
#include <conio.h>
#include <iostream>
using namespace std;
//Function prototype
int searchList (const int [ ], int);
[code].....
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Nov 3, 2014
I have an assignment where i have to prompt the user to enter the name of a file then open that file and read names of students and what level they are at university
eg : John Wilkins, sophomore
Dan Robertson, junior
etc..
i did the code and it compiles perfectly, but when i input the name of the file it gives me error: string subscript out of range.
here's the code:
Code:
#include <iostream>
#include <cstring>
#include <string>
#include<ctime>
#include <fstream>
using namespace std;
int * read_file(string filename)
[code]...
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Nov 22, 2012
I've got
[tranlated]
Code:
error C1083: cannot open: '[!output PROJECT_NAME].h': No such file or directoryd:program files (x86)autodesk3ds max
2012maxsdkhowto3dsmaxpluginwizard emplates1033atmospheric_type_atmospheric.cpp1513dsmaxPluginWizard
I opened the project
Changed it to vc100
Changed it to x64
Disabled optimization
And compiled
And the results are shown above
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Dec 15, 2012
I am asp.net C# developer. I decided to tackle C++, so I started today. This is probably something simple I am sure.
Code:
srand(static_cast<unsigned int>(time(0)));
int choice = rand() % NUM_WORDS;
string theWord = WORDS[choice][WORD];
string theHint = WORDS[choice][HINT];
[Code] ....
The error is happening on the last output operator, just before the jumble variable on the last line.The error is:
Code:
Intellisense: no operator"<<" matches these operands
operand types are: std::basic_ostream<char, std::char_traits<char> <<std::string
I understand what its saying, but jumble is a std::string
Here are my preprocessor directives and using statements
Code:
#include "stdafx.h"
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
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Dec 6, 2013
By using visual studio 2010, I have problem calling up on screen keyboard using line below for Windows 7 64 bit.
WinExec("OSK.EXE", SW_SHOW);
However, it is working fine on windows XP 32 bit. How to call up on screen keyboard for 64 bit windows?
Code:
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) {
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL) {
// initialize MFC and print and error on failure
[Code] ...
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Mar 31, 2015
I have a VC solution . This solution contain 1 execute project and 10 library projects. The libraries added to the execute project by
#pragma comment(lib,"../outputbin64/lib/mylib").
When i comment these lines to not be added these libraries to the execute project , i will have link error like this :
LINK : fatal error LNK1104: cannot open file '../outputbin64/lib/mylib.lib'
My library projects not added to execute project with another way.
My question is why the execute project will link the libraries that not added to project programmatically?
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Sep 20, 2012
class CPop {
CBSVector<CTour> pop;
CBSVector<double> probability;
int popsize;
double TotalFitness;
CTour Elite;
CTspGAParams GAParameters;
}
error C2059: syntax error : 'constant'
error C2238: unexpected token(s) preceding ';'
I don't know y these errors, it runs fine in simple c++ environment
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Jul 18, 2013
I have not completed this program yet, but I have already run into a snag. For the Input Validation part, every time you enter a number regardless if it is positive it will still display the cout statement: "Please enter positive values". The program runs correctly where I currently am at, but it just keeps reading that statement even if a user enters a positive value. I have run the debugger, but it really is not showing me anything other than I notice it jumping to that statement after every value that is entered.
Here is my code, once again I have not finished this yet, but I would really like to get this fixed first before I continue. I will keep debugging in the meantime...
Code:
// A local zoo wants to keep track of how many pounds of food each of its three monkeys eats each day during a typical week. Write a program that stores this information in a two-dimensional 3 X 7 array, where each row represents a different monkey and each column represents a different day of the week. The program should first have the user input the data for each monkey. Then it should create a report that includes the following information:
// Average amount of food eaten per day by the whole family of monkeys.
// The least amount of food eaten during the week by any one monkey.
// The greatest amount of food eaten during the week by any one monkey.
// Input validation: Do not accept negative numbers for pounds of food eaten.
#include <iostream>
#include <iomanip>
using namespace std;
int main() {
double totalAverage = 0; // variable to store the total average, initalized to zero
[Code] ......
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Oct 23, 2012
Say I have a dll that performs some mathematical parsing and calculations. The calling function is only a single C -linkage wrapper function in the dll. I can anticipate likely errors and program the dll methods to do several things when an anticipated error is encountered. (For now, let's not worry about unanticipated errors).
1 - send an error message to the user application using WM_COPYDATA
2 - throw an exception (assuming the calling app has used the try catch scenario)
3 - try to gracefully recover from the error within the dll and keep on going (jump to some safe place - but how ??)
4 - don't throw an exception from within the dll but halt the program (not very nice - the user won't know what happened)
Previous discussions on the matter have predominantly expressed the opinion that it is bad to throw exceptions from within a dll.
Long ago there was in use setjmp.h and something like
Code: if(setjmp(e_buf)) return -1;
But I believe this was only for old C applications - I'm not really sure. But at least someone back then recognized the need for getting back to a safe place in a process.
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Dec 8, 2013
Basically, I'm moving a VC project from my Windows 7 build machine to a new build machine that's running Windows 8.1. One of the pre-build steps (for a particular project) runs a script which needs to call the M4 macro processor (which is installed on my C: drive). I've been pretty careful to set everything up the same on both machines (including my PATH) but when I try to build the project on my Windows 8 box, MSVC's IDE shows me this error output when running the script:-
m4 failed with exit code 255
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Nov 27, 2014
im trying to port a code from vc6 to vs2013 and im having this error
Code:
Error11error C2440: 'initializing' : cannot convert from 'char *' to 'std::_Vector_iterator<std::_Vector_val<std::_Simple_types<char>>>' on this line
Code:
vector<char>::iterator BufIt = (char*)lpBuffer;
what i do with this is to stack fragments of data of type char* coming from a socket in buffer to a vector that acts as buffer, I do this since I transfer big chunks of data and the data gets fragmented by the nature of the sockets, I stack the data once its complete I retrieve the final result from the vector.
this code worked flawlessly for long time but now Im trying to port and compiler throws this error, whats the new way to assign a char array pointer to a iterator so i can stack it in the vector.
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Oct 19, 2013
I defined a class :
Code:
class A {
public:
enum : char { VA, VB, VC };
};
And another one :
Code:
class B {
A location;
};
In the file B.cpp, when I write :
location = A::VA;
I get an error C2679 binary '=' no operator found ... Why ?
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Aug 12, 2013
I have a crash on a application the customer machine i couldn't reproduce it yet on my machine... all i have is the error message
The Instruction 0x0070478b referencing to the memory 0x00000000 could not be written.
And that's all i have how do i track that instruction on my program from that address? is it possible?
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