fix(BmpImage): 修改加载出错提示

Author: half-nothing

src/BmpFile/include/BmpImage.h

@@ -46,6 +46,7 @@ class BmpImage {
     BmpType getBmpFileType() const;
 
 protected:
+    bool imageLoaded = false;
     BmpFileHeader bmpFileHeader{};
     BmpInfoHeader bmpInfoHeader{};
     std::ifstream inputFile = nullptr; //Bmp文件流

src/BmpFile/src/BmpImage.cpp

@@ -10,6 +10,7 @@
 
 #include "BmpImage.h"
 
+#include <QMessageBox>
 #include <glog/logging.h>
 
 BmpImage::~BmpImage() {
@@ -20,20 +21,26 @@ void BmpImage::readImage(const std::string &filename) {
     inputFile = std::ifstream(filename, std::ios::binary);
     if (!inputFile) {
         LOG(ERROR) << "Failed to open file: " << filename << std::endl;
+        QMessageBox::warning(nullptr, "无法打开图片", QString::asprintf("无法打开文件: %s", filename.c_str()));
         return;
     }
     inputFile.read(reinterpret_cast<char *>(&bmpFileHeader), sizeof(BmpFileHeader));
     if (bmpFileHeader.signature != 0x4D42) {
         LOG(ERROR) << "The file is not a valid BMP file. " << std::endl;
+        QMessageBox::warning(nullptr, "无法打开图片", "此文件不是有效的BMP文件");
         return;
     }
     inputFile.read(reinterpret_cast<char *>(&bmpInfoHeader), sizeof(BmpInfoHeader));
+    imageLoaded = true;
 }
 
 void BmpImage::saveImage(const std::string &filename) {}
 void BmpImage::toQPixMap(QPixmap &pixmap) {}
 
 BmpType BmpImage::getBmpFileType() const {
+    if (!this->imageLoaded) {
+        return LOAD_FAIL;
+    }
     switch (bmpInfoHeader.bitsPerPixel) {
         case 1: return ONE_BIT;
         case 8: return EIGHT_BIT;

src/Factory/src/BmpFactory.cpp

@@ -29,6 +29,7 @@ BmpImage *BmpFactory::createBmpImage(const std::string &filepath) {
         case UNKNOWN_BIT:
             QMessageBox::warning(nullptr, "无法加载图片", "不支持的BMP文件格式");
             LOG(ERROR) << "未知的bmp文件格式" << std::endl;
+        case LOAD_FAIL:
             return nullptr;
     }
     return nullptr;

src/include/BmpDefinition.h

@@ -95,7 +95,8 @@ struct BmpPixelInfo {
 };
 
 enum BmpType {
-    UNKNOWN_BIT = -1,
+    LOAD_FAIL = -1,
+    UNKNOWN_BIT = -2,
     ONE_BIT = 1,
     EIGHT_BIT = 8,
     TWENTY_FOUR_BIT = 24