Assigning String to Char pointer error

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I am stucked in a problem assigning a string, converted by using stringify, to a character pointer. It seemed that the character pointer(char * particleVS ) is taking only first 256 character of the string. My working in 64bit platform. Also the same code works fine for 32bit platform. I couldn't figure out why only 256 character is only being assigned in a char pointer variable in 64 bit platform could anyone please help.. Thank in advance.

code is given below

C++

#define STRINGIFY(A) #A

const char *particleVS = STRINGIFY(
uniform float pointRadius;  // point size in world space    \n
uniform float pointScale;   // scale to calculate size in pixels \n
uniform vec4 eyePos;                                        \n
void main()                                                 \n
{                                                           \n
	vec4 wpos = vec4(gl_Vertex.xyz, 1.0);                   \n
    gl_Position = gl_ModelViewProjectionMatrix * wpos;      \n

    // calculate window-space point size                    \n
    vec4 eyeSpacePos = gl_ModelViewMatrix * wpos;           \n
    float dist = length(eyeSpacePos.xyz);                   \n
    gl_PointSize = pointRadius * (pointScale / dist);       \n

    gl_TexCoord[0] = gl_MultiTexCoord0; // sprite texcoord  \n
    gl_TexCoord[1] = eyeSpacePos;                           \n

    gl_FrontColor = gl_Color;                               \n
}                                                           \n
);

Posted 13-May-13 22:20pm

amsainju

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Richard MacCutchan 14-May-13 11:32am

Like you, I tested this in 32-bit and it works fine. Unfortunately I do not have a 64-bit capable compiler so cannot test it fully. However, are you sure that this is the only way to generate this string?

amsainju 15-May-13 3:30am

I tried other methods too but the result is same.. thank you for your consideration.

Richard MacCutchan 15-May-13 4:15am

The only thing I can think of is that somehow there is a character in the string that is getting misinterpreted somehow. But, as I said above, this seems a rather complicated way of generating a string.

amsainju 15-May-13 4:35am

but unfortunately it works fine for 32 bit system.. thats bugging me.. if it had some misinterpreting character, it should had failed in 32 bit compile too.

Richard MacCutchan 15-May-13 4:47am

I found this note in MSDN, which may be part of the problem, although it does not say so specifically. I would suggest you consider an alternative to using this macro (although you still have not really explained what problem you are trying to solve).

amsainju 15-May-13 22:09pm

i tried it with two ways.
given below:

std::string str=
"attribute vec4 Position;\n"
"attribute vec2 TexCoord;\n"
"varying vec2 vTexCoord;\n"
"uniform float ScrollOffset;\n"
"uniform float Depth;\n"
"void main()\n"
"{\n"
" vTexCoord = TexCoord;\n"
" vTexCoord.s = vTexCoord.s * 0.125 + ScrollOffset;\n"
" gl_Position = Position;\n"
" gl_Position.z = Depth;\n"
"}\n";

const char *test= str.c_str();
char * writable = new char[str.size() + 1];
std::copy(str.begin(), str.end(), writable);
writable[str.size()] = '\0';

both test and writable character pointer stored truncated string of the real str string.
that is:
Result is given below
test= writable= "attribute vec4 Position;
attribute vec2 TexCoord;
varying vec2 vTexCoord;
uniform float ScrollOffset;
uniform float Depth;
void main()
{
vTexCoord = TexCoord;
vTexCoord.s = vTexCoord.s * 0.125 + ScrollOffset;
gl_Position = Position;
gl_Posi "

not whole data is assigned to test and writable (char pointer) variables. this time i did it with little simple method but the result is same

Richard MacCutchan 16-May-13 2:30am

why not just:
const char* strData = "<all your text here>";?

amsainju 16-May-13 3:03am

that too returns the samme bug... only the part of the whole string is assigned to the character pointer. even direct assigning is not working.

My tests are

const char *test2=
"Hello everyone"
"Please help me"
"my string assigning part to char pointer in a code is not working"
"I have been stucked on it for 3 days."
"I tried lot of things"
"but the problem persists."
"I have no idea why the code is not working"
" Here comes The problem in next line..."
"If you get this line in the up assigning variable..yuppieee";

const char *test3="Hello everyone .Please help me my string assigning part to char pointer in a code is not working I have been stucked on it for 3 days. I tried lot of things but the problem persists. I have no idea why the code is not working Here comes The problem in next line... If you get this line in the up assigning variable..yuppieee";

Result in

test2 ="Hello everyonePlease help memy string assigning part to char pointer in a code is not workingI have been stucked on it for 3 days.I tried lot of thingsbut the problem persists.I have no idea why the code is not working Here comes The problem in next line.."

test3 ="Hello everyone .Please help me my string assigning part to char pointer in a code is not working I have been stucked on it for 3 days. I tried lot of things but the problem persists. I have no idea why the code is not working Here comes The problem in nex"

only first 256 character is assinged to the variable.

Richard MacCutchan 16-May-13 3:47am

I think you need to take this issue to Microsoft.

amsainju 16-May-13 4:33am

I figured out that.. the problem is with compile as common Language Runtime Support(/clr) enable... i tried testing with small console application and found that with clr enable the truncated error is seen and with clr disabled the error is gone.. but i need the solution with clr support. still don't know what to do.

Richard MacCutchan 16-May-13 4:54am

I still don't know what problem you are actually trying to solve, so all I can suggest is that you break your strings into smaller chunks.

Richard MacCutchan 16-May-13 4:56am

According to http://msdn.microsoft.com/en-us/library/system.string.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1, the maximum length is about 2GB!

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MuraliChagarlamudi · Answer 1 · 2013-05-14T02:02:00

Solution 1

Have you tried with W2A & A2W convertion

Posted 14-May-13 2:02am

MuraliChagarlamudi

Comments

Richard MacCutchan 14-May-13 11:30am

What does that have to do with the stringizing operator?

amsainju 15-May-13 3:29am

no idea... i am not being able to figure out why only part of the total string is assigned.