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I am using the Security SDK for my project. I have to include
WINCRYPT.H in my project. The file has macro defined in the begining:
#ifndef __WINCRYPT_H__
#define __WINCRYPT_H__
While compiling I get a error when I use the Crypt APIs defined in the above header file.
--------------------Configuration: encrypt - Win32 Debug--------------------
Compiling...
encrypt.cpp
C:\crypt\encrypt.cpp(12) : error C2146: syntax error : missing ';' before identifier 'hCryptProv'
C:\crypt\encrypt.cpp(12) : error C2501: 'HCRYPTPROV' : missing storage-class or type specifiers
C:\crypt\encrypt.cpp(12) : fatal error C1004: unexpected end of file found
Error executing cl.exe.
When I remove the above macros, the project compiles correctly. The MSDN says that advapi32.lib should be included in the project settings which I have already included.
Where am I going wrong? Why do I get the error? 
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Check if you're #including a different header file that uses the same macros. Consider using the #pragma once directive instead.
/ravi
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Nope...still getting the error. Plesase see the modified message and let me know the solution
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Use
#pragma once
#include <wincrypt.h>
in the header file(s) where you are using Crypt APIs
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As advised, I have added following lines in my encrypt.cpp file
#pragma once
#include <wincrypt.h>
I still get the error. This error seems to occour only with wincrypt.h file. I copied the contents of wincrypt.h into another file test.h and replace
#ifndef __WINCRYPT_H__
#define __WINCRYPT_H__
with
#ifndef __TEST_H__
#define __TEST_H__
and include the test.h file, I do not get any errors. Please help me
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I have serial application, that has it's own thread that polls the serial devices. The thread reads values from the devices and storages them in a private variable. In that thread, when accessing that private variable I critical lock and unlock the variable. I also have public member function that reads that private data member. The member function is used to provide the application with access to value of the private data member. This read does not occur in the same thread.
However, because i am only reading this variable is it still necessary to critical lock and unlock this variable in the public member function?
<br />
<br />
void LENZE_8200_MOTION::ThreadRun(void)<br />
{ <br />
<br />
<br />
while(1)<br />
{<br />
/......./<br />
case LNZ82_OUTPUT_CURRENT:<br />
cResults = get_output_current(lift_address, &dTemp );
EnterCriticalSection(&m_csLiftLock);
m_dLiftOutputCurrent = dTemp; <br />
if( cResults >= 0 ){<br />
lift_cmd.Pop( &cmd );
m_lLiftFailedTxPktSeqCount = 0;
}else{ <br />
m_lLiftFailedTxPktSeqCount++;
m_lLiftFailedTxPktAccumCount++;
}<br />
LeaveCriticalSection(&m_csLiftLock);
break;<br />
<br />
case LNZ82_OPERATING_TEMPERATURE:<br />
cResults = get_temperature(lift_address, &dTemp );
EnterCriticalSection(&m_csLiftLock);
if( cResults >= 0 ){<br />
lift_cmd.Pop( &cmd );
m_lLiftFailedTxPktSeqCount = 0;
}else{ <br />
m_lLiftFailedTxPktSeqCount++;
m_lLiftFailedTxPktAccumCount++;
m_dLiftOutputTemperature = -1;<br />
}<br />
LeaveCriticalSection(&m_csLiftLock);
break;<br />
<br />
<br />
<br />
/......../<br />
}<br />
<br />
}<br />
<br />
<br />
<br />
double LENZE_8200_MOTION::lift_get_output_current(void)<br />
{ <br />
double temp;<br />
???????? Do i need critical lock here<br />
temp = m_dLiftOutputCurrent;<br />
???????? Do i need critical unlock here <br />
return temp; <br />
};<br />
<br />
<br />
double LENZE_8200_MOTION::lift_get_output_temperature(void)<br />
{ <br />
???????? Do i need critical lock here<br />
return m_dLiftOutputTemperature; <br />
???????? Do i need critical unlock here <br />
}<br />
<br />
Scott Dolan
Jernie Corporation
Engineering & Manufacturing
Software, Hardware, & Enclosures
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Yes. The read is not guaranteed to be atomic.
I use them every place I read and write critical variables that might be modified or read from different threads. No problems with the software that way.
Even more important with data longer than the size of a CPU register.
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The only situation where it can be justified to answer 'no' to that question would be if the variables was never written to.
Since you are writing to the variables at different places in your code snippet, you have to protect the data, i.e. you need the calls to ::EnterCriticalSection() and ::LeaveCriticalSection() at the places you were wondering about.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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void SetRows(
int nRows,
BOOL bLarger,
LPRECT lpRect
);
Can anybody plz explain me what is lpRect?
MSDN says :
Points to the CRect object or RECT structure that will receive the new bounding rectangle of the toolbar.
What is this new bounding rectangle?
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It seems that the CRect/RECT pointed to by lpRect will receive the toolbar control's new dimensions.
/ravi
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long pointer to CRect/RECT
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Hi,
I am working on property sheet wizard application, I have over ridden all non client area messages to customize title bar color. Now my problem once execute exe i am not able to minimize application by clicking its task bar button. Can anyone help me come out from this problem?
Thanks,
Rameshkanth
-- modified at 10:10 Wednesday 4th April, 2007
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I have minimize(-) button and close(x) button in caption bar. Here i have overidden those default button and created new one. Clicking on minimize,close button my application working fine. Even doing well on system menu also. when i click on task bar button it is not minimizing.
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Hello,
I declared a function in C++ "palloc":
void *palloc(long sz, long no)
{
long size;
void *p;
size = sz * no;
if (size == 0) size = 1;
p = (void *) malloc(size);
if (p == NULL) error("no memory size %ld", size);
return p;
}
and in another function I call this function like:
void initfirst(allinfo *a, stype ps, stype ws)
{
state *k;
a->d.set1 = palloc(MAXSTATES, sizeof(state));.......}
but I don't know why it give me an error:
Error 9 error C2440: '=' : cannot convert from 'void *' to 'state *'
Can you help me.... ?
lavinia
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In C, it's legal to assign a void* to another pointer type without a cast, but in C++ you must use a cast.
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can you give me an example... please because I don't know how to do it....
lavi
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palloc() returns void*, so you need to add a cast to the type of the variable that you're assigning to. In this case, you need a cast to state*
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a->d.set1 = (state *) palloc(MAXSTATES, sizeof(state));
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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thanks a lot...it's working 
lavi
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Hi
How can I declare static variables in visual c++.Because when I declared as public it gave linking errors.When I declared as "private static int x" and use it in a method like "public int func(){return (x);}" again it gave linking errors(error LNK2019 and fatal error LNK1120).Is there someone who knows the answer?
Thanks
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iayd wrote: Because when I declared as public it gave linking errors.
Was it declared in a .h or a .cpp file?
iayd wrote: When I declared as "private static int x"...
But did you also define it?
iayd wrote: ...again it gave linking errors(error LNK2019...
It might help to specifiy that you are using VS2003 or VS2005.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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It's not a problem with public or private. You need to define the static variable again in the implementation file (.cpp)
Eg:
yourclass.h:
class yourclass
{
static bool test;
}
yourclass.cpp
bool youclass::test;
Press: 1500 to 2,200 messages in just 6 days? How's that possible sir?
Dr.Brad :Well,I just replied to everything Graus did and then argued with Negus for a bit.
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VuNic wrote: You need to declare the static variable again...
Technically, that's called defining.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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