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Overload
Master Cheater
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Joined: 08 Feb 2008
Posts: 293
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 Posted: Thu Jun 26, 2008 1:19 am Post subject: C# & C dll help |
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ok, i have a dll i made in C *yes its basic* and i have a couple questions.
1. Can a program in C# use variables from the C dll? Like, example, use MessageBox.Show in C# to show a variables value from the C dll?
And secondly. I know this is really nooby, but i have having problems with showing a message box in the dll. So when you call its function, it will get the mouse coordinates and display them in a message box. Here is my code:
| Code: | #include <stdio.h>
#include <windows.h>
extern "C" {
void __declspec (dllexport) MouseCoords() {
POINT coords;
float x = 0;
float y = 0;
GetCursorPos(&coords);
x = coords.x;
y = coords.y;
MessageBox(
NULL,
L"X Coordinates: "
strcat(coords.x));
}
}
BOOL WINAPI DllMain (HINSTANCE, DWORD, LPVOID) {
return TRUE;
}
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EDIT: and i get these errors: | Quote: | Warning 1 warning C4244: '=' : conversion from 'LONG' to 'float', possible loss of data c:\documents and settings\tyler\desktop\mouse.dll\mouse.dll\mouse.dll.cpp 18
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i messed with the code, can't seem to fix it. 
yea, i know i am a complete noob with messing with strings (using strcat), so don't flame me, i already did it for you guys -_-
Thanks for the help. |
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Zand
Master Cheater
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Joined: 21 Jul 2006
Posts: 424
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| Posted: Thu Jun 26, 2008 3:17 am Post subject: |
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Warning != Error
and
MessageBox(
NULL,
L"X Coordinates: "
strcat(coords.x));
}
wheres your comma?
besides, strcat doesn't take 1 parameter. |
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Symbol
I'm a spammer
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Joined: 18 Apr 2007
Posts: 5094
Location: Israel.
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| Posted: Thu Jun 26, 2008 4:15 am Post subject: |
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Make a function that returns your variable and import it.
And can I ask why did you declare "float x,y" if you never used them? |
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Overload
Master Cheater
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Joined: 08 Feb 2008
Posts: 293
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| Posted: Thu Jun 26, 2008 1:09 pm Post subject: |
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| Symbol wrote: | Make a function that returns your variable and import it.
And can I ask why did you declare "float x,y" if you never used them? |
because i am going to use them. I will use them once i actually figure out how to add them to the end of the message box |
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Symbol
I'm a spammer
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Joined: 18 Apr 2007
Posts: 5094
Location: Israel.
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| Posted: Thu Jun 26, 2008 1:19 pm Post subject: |
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| Why not just using "coords" instead? |
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Overload
Master Cheater
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Joined: 08 Feb 2008
Posts: 293
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| Posted: Thu Jun 26, 2008 1:43 pm Post subject: |
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| Symbol wrote: | | Why not just using "coords" instead? |
ok, fine.
But eitherway, i just want to know how to use strcat with a message box. So i can show the value of a variable. This is what i mean (in C#)
| Code: | | MessageBox.Show("My age is: " + age); |
basically just that in C++... |
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the_undead
Expert Cheater
 Reputation: 1
Joined: 12 Nov 2006
Posts: 235
Location: Johannesburg, South Africa
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| Posted: Thu Jun 26, 2008 2:20 pm Post subject: |
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strcpy(variable, "My age is: ");
strcat(variable, age);
_________________
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HomerSexual
Grandmaster Cheater Supreme
 Reputation: 5
Joined: 03 Feb 2007
Posts: 1657
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| Posted: Thu Jun 26, 2008 5:35 pm Post subject: |
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| Overload wrote: | | Symbol wrote: | | Why not just using "coords" instead? |
ok, fine.
But eitherway, i just want to know how to use strcat with a message box. So i can show the value of a variable. This is what i mean (in C#)
| Code: | | MessageBox.Show("My age is: " + age); |
basically just that in C++... |
Thats VC++. Native C++ is MessageBox(hwnd, "Message", "Title", MB_OK)
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Flyte
Peanuts!!!!
 Reputation: 6
Joined: 19 Apr 2006
Posts: 1887
Location: Canada
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| Posted: Thu Jun 26, 2008 6:20 pm Post subject: |
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| Code: | wsprintf(buf, TEXT("My age is: %d"), age);
MessageBox(0, buf, TEXT("Age!"), 0); |
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hcavolsdsadgadsg
I'm a spammer
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Joined: 11 Jun 2007
Posts: 5801
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| Posted: Thu Jun 26, 2008 6:49 pm Post subject: |
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| POINT expects long values, not floats. |
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atom0s
Moderator
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Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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| Posted: Thu Jun 26, 2008 8:10 pm Post subject: |
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Just a suggestion from MSDN about LocalAlloc:
| Quote: | | Note The local functions are slower than other memory management functions and do not provide as many features. Therefore, new applications should use the heap functions. |
_________________
- Retired. |
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Overload
Master Cheater
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Joined: 08 Feb 2008
Posts: 293
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| Posted: Fri Jun 27, 2008 12:49 am Post subject: |
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| Flyte wrote: | | Code: | wsprintf(buf, TEXT("My age is: %d"), age);
MessageBox(0, buf, TEXT("Age!"), 0); |
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so for "buf", do i need to allocate mem? like: (char*) malloc(sizeof(buf));
Is that right? |
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