因此，我一直在寻找大约一个星期的时间，以了解如何在c ++中访问指定像素的RGB内容，但是运气不好。 我确实找到了一个适合我想要的功能的名为CImg的库，但是我编写的代码不断给我带来错误，而且我不知道自己做错了什么。
#include "CImg.h"
#include <vector>
using namespace cimg_library;
std::vector<int> GetPixel(char file[50], int x, int y)
{
CImg<int> image(file);
int r = (int)image(x, y, 0, 0);
int g = (int)image(x, y, 0, 1);
int b = (int)image(x, y, 0, 2);
std::vector<int> Pixel(2);
Pixel[0] = r;
Pixel[1] = g;
Pixel[2] = b;
return Pixel;
}
我正在使用Microsoft Visual Studio 2017，并包含CImg库的目录...我怀疑这是库问题，因为当我注释掉代码时，它会很好地构建。
编译器中的错误如下：
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(140): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(140): error C2146: syntax error: missing ';' before identifier 'PROPSHEETPAGE_RESOURCE'
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(198): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(198): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(204): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(204): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(213): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(213): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(225): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(225): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(244): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(244): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(250): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(250): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(259): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(259): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(271): error C3646: 'pResource': unknown override specifier
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\prsht.h(271): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\commctrl.h(7770): error C2061: syntax error: identifier 'LPSCROLLINFO'
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\um\commctrl.h(7785): error C2061: syntax error: identifier 'LPSCROLLINFO'
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(29): warning C4018: '<': signed/unsigned mismatch
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(31): warning C4018: '<': signed/unsigned mismatch
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(70): warning C4018: '<': signed/unsigned mismatch
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(72): warning C4018: '<': signed/unsigned mismatch
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(86): warning C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(87): warning C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(101): warning C4018: '<': signed/unsigned mismatch
1>c:\users\micah notanalien\desktop\programming projects\chili directx framework\chili framework 2016\engine\drawgame.cpp(103): warning C4018: '<': signed/unsigned mismatch
我们将不胜感激，并且如果有人拥有另一个可以正常运行的库，那就很好了。
谢谢，芬恩。
---编辑---
这是使用GetPixel（）以及其他两个GetWidth（）和GetHeight（）函数的函数...
int GetWidth(char file[50]) {
CImg<int> image(file);
return image.width();
}
int GetHeight(char file[50]) {
CImg<int> image(file);
return image.height();
}
（现在使用这些功能的功能）
void DrawGame::DrawSprite(char file[50], int x, int y)
{
int width = GetWidth(file);
int height = GetHeight(file);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++)
{
std::vector<int> Pixel;
Pixel.resize(2);
Pixel = GetPixel(file, i, j);
SetVSPixel(x + i, y + j, Pixel[0], Pixel[1], Pixel[2]);
}
}
}
（最后是主要功能）
#include "MainWindow.h"
#include "Game.h"
#include "DrawGame.h"
#include "ChiliException.h"
int WINAPI wWinMain( HINSTANCE hInst,HINSTANCE,LPWSTR pArgs,INT )
{
try
{
MainWindow wnd( hInst,pArgs );
try
{
DrawGame DrawTheGame(wnd);
DrawTheGame.CreateMatrix();
DrawTheGame.SetVSPixel(3, 5, 255, 255, 255);
Game Player(wnd, DrawTheGame);
while( wnd.ProcessMessage() )
{
DrawTheGame.Go();
DrawTheGame.DrawSprite("person.png", 8, 8);
Player.Go();
}
}
catch( const ChiliException& e )
{
const std::wstring eMsg = e.GetFullMessage() +
L"\n\nException caught at Windows message loop.";
wnd.ShowMessageBox( e.GetExceptionType(),eMsg );
}
catch( const std::exception& e )
{
// need to convert std::exception what() string from narrow to wide string
const std::string whatStr( e.what() );
const std::wstring eMsg = std::wstring( whatStr.begin(),whatStr.end() ) +
L"\n\nException caught at Windows message loop.";
wnd.ShowMessageBox( L"Unhandled STL Exception",eMsg );
}
catch( ... )
{
wnd.ShowMessageBox( L"Unhandled Non-STL Exception",
L"\n\nException caught at Windows message loop." );
}
}
catch( const ChiliException& e )
{
const std::wstring eMsg = e.GetFullMessage() +
L"\n\nException caught at main window creation.";
MessageBox( nullptr,eMsg.c_str(),e.GetExceptionType().c_str(),MB_OK );
}
catch( const std::exception& e )
{
// need to convert std::exception what() string from narrow to wide string
const std::string whatStr( e.what() );
const std::wstring eMsg = std::wstring( whatStr.begin(),whatStr.end() ) +
L"\n\nException caught at main window creation.";
MessageBox( nullptr,eMsg.c_str(),L"Unhandled STL Exception",MB_OK );
}
catch( ... )
{
MessageBox( nullptr,L"\n\nException caught at main window creation.",
L"Unhandled Non-STL Exception",MB_OK );
}
return 0;
}
主要功能是我正在观看的YouTube频道从一个入门项目中使用的，以习惯于c ++。