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Usually it is quite the opposite: C++ masters you.
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Make your hands dirty by entering into solving some problems
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Function containing for are not expected inline
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Hi
The Win32 OWNERDRAWITEM is handled by WS_DRAWITEM in the form of wParam lParam message
While framework virtual function CStatic::DrawItem takes a LPDRAWITEMSTRUCT for a parameter
Am I missing something ?
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That seems right, that kind of thing is common in MFC. In this case the lParam would need to be cast to a LPDRAWITEMSTRUCT. In MFC you don't need the cast, it's actually pretty similar.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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Doi need a message map entry to get my CStatic::DrawItem to be called I have SS_OWNERDRAW but it is not being called
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Are WS_VISIBLE and WS_CHILD styles set?
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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Just came back home yes both are set do I need to subclass the Static control
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Yes, I believe so.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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Have to Use Create DDX_Control wont do it
As aside what is the best tool to draw a nice bitmap of Text
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How did you set SS_OWNERDRAW if you did it by PreSubclassWindow in MFC there is a big gotcha with Static Text.
ModifyStyle(0, SS_OWNERDRAW);
ModifyStyle(SS_TYPEMASK, SS_OWNERDRAW);
If you look at the bit field assignments you will see why you have to mask because unlike buttons with SS_OWNERDRAW there is overlap in bits between SS_RIGHT of static text and SS_OWNERDRAW.
In vino veritas
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I set it in my resource file just SS_OWNERDRAW WS_CHILD WS_VISIBLE I tried many methods including SETBITMAP to display the bitmap nothing worked until I used Create and Drawitem
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I use the bellow code to read binary file but it throws an exceptions at run time and sometimes gives a wrong results , please tell me what's the wrong ?
#include <stdio.h>
#include <stdlib.h>
unsigned long size,n;
int main()
{
unsigned char *buf;
FILE* fp;
fp=fopen ("myfile.bin","rb");
if (fp == NULL) {
fprintf(stderr, "Can't open the file");
exit(1);}
fseek (fp,0,SEEK_END);
size=ftell (fp);
fseek (fp,0,SEEK_SET);
if ((buf=(unsigned char*) malloc (size+1))==0)
printf("\n%s","allocation Error");
n=fread (buf,sizeof (buf),size,fp);
printf ("\n%02x %lu bytes read",buf[15],n);
free (buf);
fclose (fp);
return 0;
}
modified 11-Aug-16 16:40pm.
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Fossi Bluman wrote: ...it throws an exceptions at run time...
What exception? Where?
n=fread (buf,sizeof (buf),size,fp);
printf ("\n%02x %lu bytes read",buf[15],size);
I can tell you right now that these two lines will raise eyebrows. Among other things, size is the number of bytes to read, whereas n is the number of bytes actually read.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
modified 11-Aug-16 10:16am.
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DavidCrow wrote: Among other things, size is the number of bytes to read, whereas n is the number of bytes actually read.
Just to clarify - the signature of fread() is
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
where size is the size of each data element and nmemb is the number of elements read. The returned value is the number of data elements actually read. Thus
FILE *f;
struct mystruct foo[10];
size_t n;
n = fread(foo, sizeof(struct mystruct), 10, f);
after the call to fread(), n will contain the number of (struct mystruct) items read, not the number of bytes read. So if sizeof(struct mystruct) = 42 and the stream f contains 4 items between the current file pointer and the end of file, then fread() will return 4 (the number of items), not 168 (the number of bytes [42*4]).
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All true, but that doesn't change the issue that the OP is having. I was simply hinting at the fact that size and n may differ, and the parameter being sent to printf() was incorrect.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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in your fread() statement, you have:
sizeof(buf) - the size of the pointer, at least 2 (on 16-bit processors), but typically 4 (32-bit) or 8 (64-bit) bytes these days.
size - size of file in characters (each character is defined to be 1 unit in size)
You are reading at least twice (four times / eight times) the data that you expected, overflowing the buffer.
Perhaps you meant to write:
n = fread(buf, sizeof(*buf), size, fp);
As another poster mentioned, your printf() statement also looks funny.
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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this funny "fread" doing the job , exactly as i need , any way ,, how to make it not funny ?
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Examine the printf() statement closely. You will see the following formatting:
%02x for buf[15]
%lu for size
The %02x formatting is meant for printing an unsigned int, but you are printing an unsigned char. In order to be certain that this works on all systems, cast buf[15] to unsigned int.
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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then how to print the hexadecimal values in a format of two digits ?
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Hello.
Here is another solution.
#include <iostream>
#include <fstream>
using namespace std;
int main (){
streampos size;
char * memblock;
cout<<" \n\n";
ifstream file ("myfile.bin", ios::in|ios::binary|ios::ate);
if ( file.is_open() ){
size = file.tellg();
memblock = new char [size+1];
file.seekg (0, ios::beg);
file.read (memblock, size);
file.close();
cout << "the entire file content of "<< size <<" bytes is in memory \n\n\n";
delete[] memblock;
}
else cout << "Unable to open file\n\n";
cout<<"Press ANY key to close.\n\n";
cin.ignore(); cin.get();
return 0;
}
modified 21-Aug-16 0:39am.
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thank you for reply , but I use C language .
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I am working on a C++ application.
In the header file:
typedef vector<CMyInfo*> CMyInfoBachelor;
CMyInfoBachelor* GetBachelorContained (ULONG MyID);
Now in the Cpp file
CMyInfoBachelor* CMyCache::GetBachelorContained (ULONG MyID)
{
for (..........)
{
CMyInfo* pS = GetMyInfo(RS.Get_UL("ulid",i));
if (pS)
pMyInfo->m_pUsedInTheseBachelor->push_back(pS);
}
return pMyInfo->m_pUsedInTheseBachelor;
}
The loop goes twice and i can see 2 separate values are been added to the Vector.
But for some reason it's not getting applied.
So if i look at debug window:-
m_pUsedInTheseBachelor->;***First*** has the correct value
m_pUsedInTheseBachelor->;***Last*** doesn't have the correct value, it's bunch of junk.
i.e., the Vector get's populated correctly only on the 1st loop iteration. The 2nd looping doesn't add the correct value to vector.
I am new to vector and have no idea how to fix it.
Also, how to make sure that it return properly?
The code that i tried is as follow:
In Header file:
vector<CMyInfo*> CMyInfoBachelor* GetBachelorContained (ULONG MyID);
And in Cpp file:
vector<CMyInfo*> CMyInfoBachelor* CMyCache::GetBachelorContained (ULONG MyID)
{
for (..........)
{
CMyInfo* pS = GetMyInfo(RS.Get_UL("ulid",i));
if (pS)
pMyInfo->m_pUsedInTheseBachelor->push_back(pS);
}
return pMyInfo->m_pUsedInTheseBachelor;
}
But i got a bunch of errors.
[edit]
Tidied up the formatting for you.
[/edit]
modified 10-Aug-16 2:52am.
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Your function definitions are wrong in the second version as you are declaring two different return types. The first version was correct.
Also, in the first case you say the second value pushed onto the vector is a load of junk, so you need to look at the code of GetMyInfo(RS.Get_UL("ulid",i)); to check what it is returning.
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