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digitalmars.D.learn - Does the WInMain function is mandatory ?

reply Vinod K Chandran <kcvinu82 gmail.com> writes:
Hi,
I would like to do some win api coding in D. I just taste the 
syntactic sugar but cant do anything more. I have few questions.
1. Does WinMain is needed for a D program in order to use win api 
?
2. Can we use D strings in win api functions ?, If not, please 
show me how to convert strings
Sep 29 2018
parent reply rikki cattermole <rikki cattermole.co.nz> writes:
On 30/09/2018 7:24 PM, Vinod K Chandran wrote:

 Hi,
 I would like to do some win api coding in D. I just taste the syntactic 
 sugar but cant do anything more. I have few questions.
 1. Does WinMain is needed for a D program in order to use win api ?


No.


 2. Can we use D strings in win api functions ?, If not, please show me 
 how to convert strings


null terminated, nothing really special.
Sep 29 2018
next sibling parent reply bauss <jj_1337 live.dk> writes:
On Sunday, 30 September 2018 at 06:33:47 UTC, rikki cattermole 
wrote:

 null terminated, nothing really special.


To elaborate on this.

There is function that does it for you called toStringz()

https://dlang.org/library/std/string/to_stringz.html
Sep 29 2018
next sibling parent Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 06:56:41 UTC, bauss wrote:

 On Sunday, 30 September 2018 at 06:33:47 UTC, rikki cattermole 
 wrote:

 null terminated, nothing really special.


 To elaborate on this.

 There is function that does it for you called toStringz()

 https://dlang.org/library/std/string/to_stringz.html


Thanks for the reply. Let me check it.
Sep 30 2018
prev sibling parent reply Adam D. Ruppe <destructionator gmail.com> writes:
On Sunday, 30 September 2018 at 06:56:41 UTC, bauss wrote:

 There is function that does it for you called toStringz()

 https://dlang.org/library/std/string/to_stringz.html


Not really best for Windows. That's for calling C functions with 
char*, for Windows, you should be working with wchar* instead.

http://dpldocs.info/experimental-docs/std.utf.toUTFz.html

so usage is:

toUTFz!(wchar*)(your_string_here);


If passing string literals to Windows, you can put a w at the 
end, like:

MessageBoxW(null, "Hello"w, "World"w, 0); // note the ""w
Sep 30 2018
parent reply Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 12:48:17 UTC, Adam D. Ruppe wrote:


 so usage is:

 toUTFz!(wchar*)(your_string_here);


 If passing string literals to Windows, you can put a w at the 
 end, like:

 MessageBoxW(null, "Hello"w, "World"w, 0); // note the ""w


Thanks for the reply. But it says "toUTFz" is not defined. do i 
missing any import statement ?
Sep 30 2018
next sibling parent Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 13:17:33 UTC, Vinod K Chandran 
wrote:

 On Sunday, 30 September 2018 at 12:48:17 UTC, Adam D. Ruppe 
 wrote:


 so usage is:

 toUTFz!(wchar*)(your_string_here);


 If passing string literals to Windows, you can put a w at the 
 end, like:

 MessageBoxW(null, "Hello"w, "World"w, 0); // note the ""w


 Thanks for the reply. But it says "toUTFz" is not defined. do i 
 missing any import statement ?


I am trying to make this function, but compiler is rejecting all 
my attempts.
```D
int MsgBox(string MsgTxt,  string titleTxt = "MessageBox") {
     const wchar* Mesg = toUTFz! (wchar*)(MsgTxt) ;
     const wchar* Tit = toUTFz! (wchar*)(itleTxt) ;
     MessageBoxW(null, Mesg, Tit, 0) ;
	return 0 ;
}
```
Sep 30 2018
prev sibling parent reply Adam D. Ruppe <destructionator gmail.com> writes:
On Sunday, 30 September 2018 at 13:17:33 UTC, Vinod K Chandran 
wrote:

 Thanks for the reply. But it says "toUTFz" is not defined. do i 
 missing any import statement ?


import std.utf;
Sep 30 2018
parent reply Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 13:21:59 UTC, Adam D. Ruppe wrote:

 On Sunday, 30 September 2018 at 13:17:33 UTC, Vinod K Chandran 
 wrote:

 Thanks for the reply. But it says "toUTFz" is not defined. do 
 i missing any import statement ?


 import std.utf;


Thanks. It worked.
I  would like to compile this as a gui. Now it starts with the 
cmd. Google search didn't gave me the link i want. Any help ?
Sep 30 2018
parent reply Mike Parker <aldacron gmail.com> writes:
On Sunday, 30 September 2018 at 14:06:20 UTC, Vinod K Chandran 
wrote:


 Thanks. It worked.
 I  would like to compile this as a gui. Now it starts with the 
 cmd. Google search didn't gave me the link i want. Any help ?


With the default OPTLINK linker:

dmd -L/SUBSYSTEM:windows app.d

In this case, user32.lib where MessageBoxW and MessageBoxA reside 
is automatically linked.

When using the MS linker:

dmd -m64 -L/SUBSYSTEM:windows -L/ENTRY:mainCRTStartup app.d 
user32.lib

In this case, user32.lib is not automatically linked. Replace 
-m64 with -m32mscoff for 32-bit output with the MS linker.

-L passes command line options to the current linker.
Sep 30 2018
parent Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 15:06:31 UTC, Mike Parker wrote:

 On Sunday, 30 September 2018 at 14:06:20 UTC, Vinod K Chandran 
 wrote:


 Thanks. It worked.
 I  would like to compile this as a gui. Now it starts with the 
 cmd. Google search didn't gave me the link i want. Any help ?


 With the default OPTLINK linker:

 dmd -L/SUBSYSTEM:windows app.d

 In this case, user32.lib where MessageBoxW and MessageBoxA 
 reside is automatically linked.

 When using the MS linker:

 dmd -m64 -L/SUBSYSTEM:windows -L/ENTRY:mainCRTStartup app.d 
 user32.lib

 In this case, user32.lib is not automatically linked. Replace 
 -m64 with -m32mscoff for 32-bit output with the MS linker.

 -L passes command line options to the current linker.


Thanks for the reply. I think its better to write a program in 
which we can choose this codes from a combobox and click a button 
to start compiling.
Oct 02 2018
prev sibling parent Vinod K Chandran <kcvinu82 gmail.com> writes:
On Sunday, 30 September 2018 at 06:33:47 UTC, rikki cattermole 
wrote:


 No.


 2. Can we use D strings in win api functions ?, If not, please 
 show me how to convert strings


 null terminated, nothing really special.


Hi,
Thanks for the reply.
I somehow managed to display a messagebox with "const(wchar)*"
Sep 30 2018