c ++在win32学校应用程序中构建错误 [英] c++ build errors on win32 school application
问题描述
我没有在c ++编程非常长，但需要为我的学校做一个Win32应用程序。
错误：
pre>错误C2440：'='：无法从'const char [11]'转换为'LPCWSTR'
错误C2664：'CreateWindowExW'：无法将参数2从'const
错误C2664：'TextOutW'：不能将参数4从'char *'转换为'LPCWSTR'
IntelliSense：类型char *的参数与参数不兼容类型LPCWSTR
不知道如果所有其他的是正确的，那些4错误现在
cpp文件：
/ * Hoofdstuk 10 ，用户界面* /
#includeCallback_NYCM.h
// UI
int WINAPI WinMain（HINSTANCE thisInstance，HINSTANCE prevInstance，LPSTR lpCmdLine，int nShowCmd）
{
PAINTSTRUCT ps;
HDC hdc;
MSG msg;
HWND hwnd;
WNDCLASSEX wndclassex; // struct_WNDCLASSEX via windows.h
// toekenning
wndclassex.cbSize = sizeof（WNDCLASSEX）;
wndclassex.style = CS_HREDRAW | CS_VREDRAW;
wndclassex.lpfnWndProc = WndProc;
wndclassex.cbClsExtra = 0;
wndclassex.cbWndExtra = 0;
wndclassex.hInstance = thisInstance;
wndclassex.hIcon = LoadIcon（NULL，IDI_APPLICATION）;
wndclassex.hCursor = LoadCursor（thisInstance，IDC_ARROW）;
wndclassex.hbrBackground =（HBRUSH）（COLOR_WINDOW + 1）;
wndclassex.lpszMenuName = NULL;
wndclassex.lpszClassName =WNDCLASSEX;
wndclassex.hIconSm = LoadIcon（NULL，IDI_APPLICATION）;
// functie aanroep
RegisterClassEx（& wndclassex）;
// IfThen - > CreateWindows
if（！（hwnd = CreateWindowEx（NULL，WNDCLASSEX，Hoofdstuk 10，WS_OVERLAPPEDWINDOW
| WS_VISIBLE，50,50,650,300，NULL，NULL，thisInstance，NULL）））
{
return 0;
}
// logische structuur
while（GetMessage（& msg，NULL，0，0））
{
if（msg.message == WM_QUIT）
break;
TranslateMessage（& msg）;
DispatchMessage（& msg）;
}
return（int）msg.wParam;
};
头文件：
/ * Hoofdstuk 10，Deelnemer.h * /
// Declaratie
class Deelnemer
{
private：
char * nm;
public：
//构造函数
Deelnemer（）{
}
// Methoden = prototype
void Deelnemer :: Invoeren ;
char * Deelnemer :: WeergevenNaam（）;
};
//Implemenmtatie.Invoeren
void Deelnemer :: Invoeren（）
{
nm =Roy;
}
//.Weergeven
char * Deelnemer :: WeergevenNaam（）
{
return nm;
}
callback_NYCM.h：
/ * Hoofdstuk 10，Callback_NYCM * /
#includeWindows.h
#includeDeelnemer.h
//原型
LRESULT CALLBACK WndProc（HWND hwnd，UINT message，WPARAM wparam，LPARAM lparam）;
//实现
LRESULT CALLBACK WndProc（HWND hwnd，UINT message，WPARAM wparam，LPARAM lparam）
{
//构造
PAINTSTRUCT ps;
HDC hdc;
MSG msg;
WNDCLASSEX wndclassex;
// HWND hwnd;
Deelnemer deelnemer1;
// UI
切换（消息）
{
case WM_PAINT：
{
//Functieaanroep.Initialisatie
deelnemer1.Invoeren（）;
//.TextOut
TextOut（hdc，50,50，deelnemer1.WeergevenNaam（），
strlen（deelnemer1.WeergevenNaam（）））;
EndPaint（hwnd，& ps）;
return 0;
}
break;
case WM_DESTROY：
{
PostQuitMessage（0）;
return 0;
}
break;
默认值：
{
return DefWindowProc（hwnd，message，wparam，lparam）;
}
break;
}
return 0;
}
我认为我的构造函数或类似的东西是错误的， * Deelnemer :: WeergevenNaam（）
有人可以解释我的代码有什么问题，所以我知道如何让它工作吗？
UPDATE：
更新应用程序需要使用UNICODE字符串
，即LMyString而不是MyString。你还需要
使用WCHAR / wchar_t代替char
但是如何做我的代码，有人帮忙吗？
更新2：
解决了很多错误！
$ b $ Deelnemer deelnemer1;
switch（message）
{
case WM_PAINT：
{
//Functieaanroep.Initialisatie
deelnemer1.Invoeren（）;
//.TextOut
TextOut（hdc，50,50，deelnemer1.WeergevenNaam（），
strlen（deelnemer1.WeergevenNaam（）））;
EndPaint（hwnd，& ps）;
return 0;
}
所以错误在线：deelnemer1.WeergevenNaam（）
-TextOutW'：无法将参数4从'char *'转换为'LPCWSTR'
-IntelliSense： char *与类型LPCWSTR的参数不兼容
更新3：
一个解决方案（像你们下面说的）但现在我只有这一个离开：
TextOut（hdc，50,50，deelnemer1.WeergevenNaam（）， / on the deelnemer1.weergevenNaam（）
错误C2664：'TextOutW'：无法将参数4从'const char *'转换为'LPCWSTR'
您的代码编写为ANSI编译，但您的解决方案设置包括 _UNICODE / UNICODE 。您可以通过更改字符集（在配置属性的常规节点上）从使用Unicode字符集到使用多字节字符集或更新您的应用程序代码（建议后者）。
更新您的应用程序需要使用UNICODE字符串字面，即 LMyString而不是MyString 。您还需要使用 WCHAR / wchar_t 替换 char （如果适用）并调用宽版本的Windows API。对于许多API调用，存在一个宽泛的版本，最后有一个 W ，例如。 CreateWindowExW 。如果您使用的是标准C ++库，您还需要确保使用需要字符编码的UNICODE变体（例如 std :: wstring 而不是 std :: string ）。有关其他信息，请参见 Visual C ++中的文本和字符串。 p>
有关这里发生了什么的更多背景：Windows API和Microsoft的CRT实现可以用于使用ANSI /多字节字符集或UNICODE字符集编译代码。为了支持两种字符编码，C / C ++预处理器根据 _UNICODE 和 UNICODE是否替换相应的字符类型和API调用 $
例如，调用 CreateWindowEx CreateWindowExA 或 CreateWindowExW 。两个实现对于字符串参数（分别为 char * 和 wchar_t * ）具有不同的参数类型。要使用ANSI /多字节编码，调用将是 CreateWindowExA（NULL，WNDCLASSEX，...）。对于UNICODE它看起来像 CreateWindowExW（NULL，LWNDCLASSEX，...）。
在预处理程序通过之后代码的外观，您可以使用 / P 或 / E 编译器开关（假设您使用的是Microsoft编译器）。
注意：不要忘记阅读绝对最小的每个软件开发人员绝对必须了解Unicode和字符集（无需借口！）。
I haven't been programming in c++ very long, but need to make an Win32 application for my school. The teacher helped me a lot with information but after a few days of trying I am still stuck.
Errors:
error C2440: '=' : cannot convert from 'const char [11]' to 'LPCWSTR'
error C2664: 'CreateWindowExW' : cannot convert parameter 2 from 'const char [11]' to 'LPCWSTR'
error C2664: 'TextOutW' : cannot convert parameter 4 from 'char *' to 'LPCWSTR'
IntelliSense: argument of type "char *" is incompatible with parameter of type "LPCWSTR"
Don't know if all the other suff is right, but i only get those 4 error now
cpp file:
/* Hoofdstuk 10, User Interface */
#include "Callback_NYCM.h"
// UI
int WINAPI WinMain(HINSTANCE thisInstance,HINSTANCE prevInstance,LPSTR lpCmdLine,int nShowCmd)
{
PAINTSTRUCT ps;
HDC hdc;
MSG msg;
HWND hwnd;
WNDCLASSEX wndclassex; //struct_WNDCLASSEX via windows.h
// toekenning
wndclassex.cbSize = sizeof(WNDCLASSEX);
wndclassex.style = CS_HREDRAW | CS_VREDRAW;
wndclassex.lpfnWndProc = WndProc;
wndclassex.cbClsExtra = 0;
wndclassex.cbWndExtra = 0;
wndclassex.hInstance = thisInstance;
wndclassex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclassex.hCursor = LoadCursor(thisInstance,IDC_ARROW);
wndclassex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wndclassex.lpszMenuName = NULL;
wndclassex.lpszClassName = "WNDCLASSEX";
wndclassex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
// functie aanroep
RegisterClassEx(&wndclassex);
// IfThen -> CreateWindows
if(!(hwnd = CreateWindowEx(NULL,"WNDCLASSEX","Hoofdstuk 10",WS_OVERLAPPEDWINDOW
| WS_VISIBLE,50,50,650,300,NULL,NULL,thisInstance,NULL)))
{
return 0;
}
// logische structuur
while(GetMessage(&msg, NULL, 0, 0))
{
if(msg.message == WM_QUIT)
break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
};
header file:
/*Hoofdstuk 10, Deelnemer.h*/
//Declaratie
class Deelnemer
{
private:
char* nm;
public:
//Constructor
Deelnemer(){
}
//Methoden = prototype
void Deelnemer::Invoeren();
char* Deelnemer::WeergevenNaam();
};
//Implemenmtatie.Invoeren
void Deelnemer::Invoeren()
{
nm = "Roy";
}
//.Weergeven
char* Deelnemer::WeergevenNaam()
{
return nm;
}
callback_NYCM.h:
/*Hoofdstuk 10, Callback_NYCM*/
#include "Windows.h"
#include "Deelnemer.h"
// prototype
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam);
//Implementatie
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)
{
//Constructie
PAINTSTRUCT ps;
HDC hdc;
MSG msg;
WNDCLASSEX wndclassex;
// HWND hwnd;
Deelnemer deelnemer1;
//UI
switch(message)
{
case WM_PAINT:
{
//Functieaanroep.Initialisatie
deelnemer1.Invoeren();
//.TextOut
TextOut(hdc,50,50,deelnemer1.WeergevenNaam(),
strlen(deelnemer1.WeergevenNaam()));
EndPaint(hwnd,&ps);
return 0;
}
break;
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
}
break;
default:
{
return DefWindowProc(hwnd,message,wparam,lparam);
}
break;
}
return 0;
}
I think my constructor or something like that is wrong and my return value for char* Deelnemer::WeergevenNaam()
Could somebody explain me what is wrong in my code so I know how to get it working?
UPDATE:
Updating your application requires to use UNICODE string literals throughout, i.e. L"MyString" instead of "MyString". You also need to use WCHAR/wchar_t in place of char
But how do i do this with my code, could somebody help?
UPDATE 2:
That solved al lot of errors!
But i have some more errors left in this part
Deelnemer deelnemer1;
switch(message)
{
case WM_PAINT:
{
//Functieaanroep.Initialisatie
deelnemer1.Invoeren();
//.TextOut
TextOut(hdc,50,50,deelnemer1.WeergevenNaam(),
strlen(deelnemer1.WeergevenNaam()));
EndPaint(hwnd,&ps);
return 0;
}
so the errors are on line: deelnemer1.WeergevenNaam()
-TextOutW' : cannot convert parameter 4 from 'char *' to 'LPCWSTR'
-IntelliSense: argument of type "char *" is incompatible with parameter of type "LPCWSTR"
UPDATE 3:
After some testing i found a solution (like you guys said below) But now i only got this one left:
TextOut (hdc,50,50,deelnemer1.WeergevenNaam(), // on the deelnemer1.weergevenNaam()
with error C2664: 'TextOutW' : cannot convert parameter 4 from 'const char *' to 'LPCWSTR'
Your code is written to compile as ANSI but your solution settings include _UNICODE/UNICODE. You can either set your solution to use ANSI encoding by changing Character Set (on the General node of the Configuration Properties) from Use Unicode Character Set to Use Multi-Byte Character Set or update your application code (the latter is recommended).
Updating your application requires to use UNICODE string literals throughout, i.e. L"MyString" instead of "MyString". You also need to use WCHAR/wchar_t in place of char (where applicable) and call the wide versions of the Windows API. For many API calls there exists a wide version that has a W at the end, e.g. CreateWindowExW. If you are using the Standard C++ Library you will also want to make sure to use the UNICODE variants where character encoding is necessary (e.g. std::wstring instead of std::string). Additional information can be found at Text and Strings in Visual C++.
A bit more background about what is going on here: The Windows API and Microsoft's CRT implementation can be used to compile code using ANSI/Multi-Byte character set or UNICODE character set. To support both character encodings the C/C++ preprocessor replaces the respective character types and API calls with the specific implementations depending on whether or not the _UNICODE and UNICODE preprocessor symbol is defined.
For example, the call CreateWindowEx is expanded to either CreateWindowExA or CreateWindowExW. Both implementations have different parameter types for string arguments (char* and wchar_t* respectively). To use ANSI/Multi-Byte encoding the call would be CreateWindowExA(NULL,"WNDCLASSEX",...). For UNICODE it would look like CreateWindowExW(NULL,L"WNDCLASSEX",...).
To see what the code looks like after the preprocessor is through you can use the /P or /E compiler switches (assuming you're using the Microsoft Compiler).
Note: Don't forget to read The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!).
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